样式: 排序: IF: - GO 导出 标记为已读
-
A Simulation Study of the Modulation of the Geomagnetic Field Configuration on the Seasonal Variation of Ionospheric Sq Currents J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-17 Yunbo Liu, Zhipeng Ren, Yong Wei, Xu Zhou
Based on Global Coupled Ionosphere-Thermosphere-Electrodynamics Model, the solution of the 3-dimensional current in the ionospheric region, the equivalent sheet current and filed-aligned current are examined. The simulation study enables a comprehensive analysis of the effect of the geomagnetic field configuration, especially the non-dipole component and tilt angle, on the ionospheric electrodynamics
-
Investigating the Main Features of the Correlation Between Electron Density and Temperature in the Topside Ionosphere Through Swarm Satellites Data J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-17 A. Pignalberi, F. Giannattasio, V. Truhlik, I. Coco, M. Pezzopane, T. Alberti
Electron density (Ne) and electron temperature (Te) observations collected by Langmuir Probes on board the European Space Agency (ESA) Swarm B satellite are used to characterize their correlation in the topside ionosphere at an altitude of about 500 km. Spearman correlation coefficient values (RSpearman) are calculated on joint probability distributions between Ne and Te for selected conditions. The
-
Large-Scale Traveling Ionospheric Disturbances Over the European Sector During the Geomagnetic Storm on March 23–24, 2023: Energy Deposition in the Source Regions and the Propagation Characteristics J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-15 Grzegorz Nykiel, Arthur Ferreira, Florian Günzkofer, Pelin Iochem, Samira Tasnim, Hiroatsu Sato
Multiple Large-Scale Traveling Ionospheric Disturbances (LSTIDs) are observed in the European sector in both day-time and night-time during the magnetic storm on March 23–24, 2023. The Total Electron Content (TEC) observation from a network of GNSS receivers shows the propagation of LSTIDs with amplitudes between around 0.5 and 1 TECU originating from auroral and polar cusp regions down to southern
-
Modeling the Global Distribution of Chorus Wave Induced Relativistic Microburst Spatial Characteristics J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-16 Ning Kang, Jacob Bortnik, Qianli Ma, Seth Claudepierre
The full spatiotemporal distribution of chorus wave-induced relativistic electron microburst is modeled for chorus waves originated from different L shells and MLTs, based on the newly developed numerical precipitation model (Kang et al., 2022, https://doi.org/10.1029/2022gl100841). The wave-particle interaction process that induces each microburst is analyzed in detail, and its relation to the chorus
-
Whistler-Mode Waves Inside Short Large-Amplitude Magnetic Field Structures: Characteristics and Generation Mechanisms J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-14 Shi-Chen Bai, Quanqi Shi, Xiao-Chen Shen, Anmin Tian, Hui Zhang, Ruilong Guo, Mengmeng Wang, Alexander W. Degeling, Yude Bu, Shuai Zhang, Xiao Ma
Short large-amplitude magnetic structures (SLAMS) frequently appear near the bow shock. Inside steepening SLAMS, whistler-mode waves are coherently generated at their leading edges. These waves are crucial for electron dynamics, energy conversion and magnetic reconnection near the shock. Nevertheless, the characteristics and generation of the whistler-mode waves inside SLAMS are still unclear. In this
-
Ion-Scale Magnetic Flux Ropes and Loops in Earth's Magnetotail: An Automated, Comprehensive Survey of MMS Data Between 2017 and 2022 J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-16 A. W. Smith, W. Sun, J. A. Slavin, I. J. Rae
Magnetic reconnection is a critically important process in defining the dynamics and energy transport within plasma environments. In near-Earth space we may track where and when reconnection occurs by identifying associated coherent magnetic structures. On a global scale these structures facilitate the flow of mass and magnetic flux into, within, and out of the magnetospheric system, whilst contributing
-
Determining the Influence of the IMF and Planetary Magnetic Field Models on Mercury's Magnetosphere Along Spacecraft Trajectories of MESSENGER, BepiColombo and MPO J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-15 Willi Exner, Léa S. Griton, Daniel Heyner
Mercury's planetary magnetic field models (PMFMs) agree on a majorly dipolar field structure with a northward shift of the magnetic equator. However, due to the northerly biased orbit coverage of past spacecraft missions and different data analyzing methods, the available PMFMs differ in the determined multipole magnitudes for the dipole, quadrupole and octupole moments. While the PMFMs agree well
-
Multi Satellite Observation of a Foreshock Bubble Causing an Extreme Magnetopause Expansion J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-14 Niklas Grimmich, Fabio Prencipe, Drew L. Turner, Terry Z. Liu, Ferdinand Plaschke, Martin O. Archer, Rumi Nakamura, David G. Sibeck, Johannes Z. D. Mieth, Hans-Ulrich Auster, O. Dragos Constantinescu, David Fischer, Werner Magnes
The interaction of a solar wind discontinuity with the backstreaming particles of the Earth’s ion foreshock can generate hot, tenuous plasma transients such as foreshock bubbles (FB) and hot flow anomalies (HFA). These transients are known to have strong effects on the magnetosphere, distorting the magnetopause (MP), either locally during HFAs or globally during FBs. However, previous studies on the
-
Variation in the Pedersen Conductance Near Jupiter's Main Emission Aurora: Comparison of Hubble Space Telescope and Galileo Measurements J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-11 M. J. Rutala, J. T. Clarke, M. F. Vogt, J. D. Nichols
We present the first large-scale statistical survey of the Jovian main emission (ME) to map auroral properties from their ionospheric locations out into the equatorial plane of the magnetosphere, where they are compared directly to in-situ spacecraft measurements. We use magnetosphere-ionosphere (MI) coupling theory to calculate currents from the auroral brightness as measured with the Hubble Space
-
Magnetotail Variability During Magnetospheric Substorms J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-11 S. Kumar, T. I. Pulkkinen, J. Gjerloev
In this work, we present a statistical study of substorms covering a five-year period 2016–2020. Substorm phases were identified from time series of the SuperMAG AL (SML) index using a list of 5,077 previously identified substorm onsets, the SML peak value marking transition from expansion to recovery phase, and the recovery identified as return to activity less than −100 nT in the SML index. Magnetic
-
Nonresonant Scattering of Energetic Electrons by Electromagnetic Ion Cyclotron Waves: Spacecraft Observations and Theoretical Framework J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-10 Xin An, Anton Artemyev, Vassilis Angelopoulos, Xiao-Jia Zhang, Didier Mourenas, Jacob Bortnik, Xiaofei Shi
Electromagnetic ion cyclotron (EMIC) waves lead to rapid scattering of relativistic electrons in Earth's radiation belts, due to their large amplitudes relative to other waves that interact with electrons of this energy range. A central feature of electron precipitation driven by EMIC waves is deeply elusive. That is, moderate precipitating fluxes at energies below the minimum resonance energy of EMIC
-
Key Factors Determining Nightside Energetic Electron Losses Driven by Whistler-Mode Waves J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-10 Ethan Tsai, Anton Artemyev, Qianli Ma, Didier Mourenas, Oleksiy Agapitov, Xiao-Jia Zhang, Vassilis Angelopoulos
Energetic electron losses by pitch-angle scattering and precipitation to the atmosphere from the radiation belts are controlled, to a great extent, by resonant wave particle interactions with whistler-mode waves. The efficacy of such precipitation is primarily modulated by wave intensity, although its relative importance, compared to other wave and plasma parameters, remains unclear. Precipitation
-
Variations of Inter-Hemispheric Field-Aligned Currents: Observations From Ground Geomagnetic Measurements J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-10 R. K. Archana, Kusumita Arora
The east–west component of the geomagnetic field (Y-component) at the Trivandrum (TRD) station, an equatorial site, is used to investigate the characteristics of Inter-Hemispheric Field-Aligned Currents (IHFACs) in the Indian sector during solar cycles 21 and 22. The observations reveal an annual variation of IHFAC in the dawn/noon sector with positive/negative peaks around northern summer. Furthermore
-
Feature of Diurnal Double Maxima in the Topside Ionosphere Observed by ICON J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-08 Rongjin Du, Ruilong Zhang, Libo Liu, Tingwei Han, Wenbo Li, M. Arslan Tariq, Huijun Le, Yiding Chen, Yuyan Yang
This study investigates the diurnal variation of topside ionospheric plasma density using the Ionospheric Connection Explorer (ICON) observations from May to July in 2020 and 2021. The total ion density exhibits daytime double-maxima (DDM) patterns, also known as “bite-out” at magnetic latitudes from 10°S to 20°N and longitudes of 180°–276°E, but a single peak in other longitudes. The total ion density
-
Modeling the Contribution of Precipitation Loss to a Radiation Belt Electron Dropout Observed by Van Allen Probes J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-09 Zhi-Gu Li, Weichao Tu, Richard Selesnick, Jinbei Huang
A drift-diffusion model is used to simulate the low-altitude electron distribution, accounting for azimuthal drift, pitch angle diffusion, and atmospheric backscattering effects during a rapid electron dropout event on 21st August 2013, at L = 4.5. Additional external loss effects are introduced during times when the low-altitude electron distribution cannot be reproduced by diffusion alone. The model
-
Thin Current Sheets in the Magnetotail at Lunar Distances: Statistics of ARTEMIS Observations J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-09 S. R. Kamaletdinov, A. V. Artemyev, A. Runov, V. Angelopoulos
The magnetotail current sheet's (CSs) spatial configuration and stability control the onset of magnetic reconnection - the driving process for magnetospheric substorms. The near-Earth CS has been thoroughly investigated by numerous missions, whereas the midtail CS has not been adequately explored. This is especially the case for the long-term variation of its configuration in response to the solar
-
EMM EMUS Observations of Hot Oxygen Corona at Mars: Radial Distribution and Temporal Variability J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-10 Krishnaprasad Chirakkil, Justin Deighan, Michael S. Chaffin, Sonal K. Jain, Robert J. Lillis, Susarla Raghuram, Greg Holsclaw, David A. Brain, Ed Thiemann, Phil Chamberlin, Matthew O. Fillingim, J. Scott Evans, Scott England, Hessa AlMatroushi, Hoor AlMazmi, Frank Eparvier, Marko Gacesa, Nayla El-Kork, Shannon M. Curry
We present the first observations of the dayside coronal oxygen emission in far ultraviolet (FUV) measured by the Emirates Mars Ultraviolet Spectrometer (EMUS) onboard the Emirates Mars Mission (EMM). The high sensitivity of EMUS is providing an opportunity to observe the tenuous oxygen corona in FUV, which is otherwise difficult to observe. Oxygen resonance fluorescence emission at 130.4 nm provides
-
Development of Low Latitude Long Range Ionospheric Radar for Observing Plasma Bubble Irregularities and Preliminary Results J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-07 Lianhuan Hu, Guozhu Li, Baiqi Ning, Wenjie Sun, Haiyong Xie, Xiukuan Zhao, Yi Li, Guofeng Dai, Qi Xiao, Yong Yan
The Low lAtitude long Range Ionospheric raDar (LARID), which consists of two high frequency (HF) radars looking toward the east and west of Hainan Island, respectively, has been developed and installed at Dongfang (19.2°N, 108.8°E, dip lat. 13.8°N), China. This paper describes the system design of LARID and its first observational results of equatorial plasma bubble (EPB) irregularities. The antenna
-
Revised Magnetospheric Model Reveals Signatures of Field-Aligned Current Systems at Mercury J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-08 K. Pump, D. Heyner, D. Schmid, W. Exner, Ferdinand Plaschke
Mercury is the smallest and innermost planet of our solar system and has a dipole-dominated internal magnetic field that is relatively weak, very axisymmetric and significantly offset toward north. Through the interaction with the solar wind, a magnetosphere is created. Compared to the magnetosphere of Earth, Mercury's magnetosphere is smaller and more dynamic. To understand the magnetospheric structures
-
3D Traveling Ionospheric Disturbances During the 2022 Hunga Tonga–Hunga Ha’apai Eruption Using GNSS TEC J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-02 Mokhamad Nur Cahyadi, Buldan Muslim, Ihsan Naufal Muafiry, Aditya Riadi Gusman, Eko Yuli Handoko, Ira Mutiara Anjasmara, Meilfan Eka Putra, Mega Wulansari, Dwi Sri Lestari, Shuanggen Jin, Josaphat Tetuko Sri Sumantyo
The dual frequency Global Navigation Satellite System (GNSS) observations could determine the total electron content (TEC) in the ionosphere. In this study, GNSS TEC was applied to detect traveling ionospheric disturbances (TIDs) after the eruption of Hunga Tonga–Hunga Ha’apai (HTHH) on 15 January 2022. The eruption caused two types of tsunamis, first is tsunami generated by atmospheric wave (meteo-tsunami)
-
Evolving Phase Propagation in an Intermediate-m ULF Wave Driven by Substorm-Injected Particles J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-04 C. M. Michael, T. K. Yeoman, D. M. Wright, M. A. Chelpanov, P. N. Mager
An ultralow frequency (ULF) wave was simultaneously observed in the ionosphere by the Super Dual Auroral Radar Network (SuperDARN) radar at Hankasalmi, Finland and on the ground by the International Monitor for Auroral Geomagnetic Effects (IMAGE) magnetometers with close proximity to the radar. The onset time of the wave event was around 03:00 magnetic local time. Fourier wave analysis of the event
-
F1 Region Ion Composition in Svalbard During the International Polar Year 2007–2008 J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-02 Ilkka I. Virtanen, Habtamu W. Tesfaw, Anita T. Aikio, Roger Varney, Antti Kero, Neethal Thomas
Ions in the F region ionosphere at 150–400 km altitude consist mainly of molecular NO+ and O2+${\mathrm{O}}_{2}^{+}$, and atomic O+. Incoherent scatter (IS) radars are sensitive to the molecular-to-atomic ion density ratio, but its effect to the observed incoherent scatter spectra is almost identical with that of the ion temperature. It is thus very difficult to fit both the ion temperature and the
-
Parallel Electron Beams at Io: Numerical Simulations of the Dense Plasma Wake J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-29 V. Dols, W. R. Paterson, F. Bagenal
In 1995, the Galileo spacecraft traversed the wake of Io at ∼900 km altitude. The instruments onboard detected intense bi-directional field-aligned electron beams (∼140 eV–150 keV), embedded in a dense, cold and slow plasma wake (Nel ∼ 35,000 cm−3, Ti < 10 eV, V < 3 km/s). Similar electron beams were also detected along subsequent Galileo flybys. Using numerical simulations, we show that these electron
-
Large TEC Variations Between Mars and Earth: Simulation and Observation Comparisons J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-03-02 Qingbao He, Kaijun Liu, Zhichao Wang, Qinghui Liu, Li Guo
Large total electron content (TEC) variations along the line from Mars to Earth have been demonstrated by analyzing the ground received Tianwen-1 differential one-way range (DOR) signals when corona mass ejections (CMEs) and co-rotating interaction regions (CIRs) pass through the signal path. Here, the TEC variations along the line from Mars to Earth are calculated from the Wang-Sheeley-Arge (WSA)-Enlil
-
Complex Whistler-Mode Wave Features Created by a High Density Plasma Duct in the Magnetosphere J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-26 Vijay Harid, Oleksiy Agapitov, Raahima Khatun-E-Zannat, Mark Gołkowski, Poorya Hosseini
A Van Allen Probes observation of a high-density duct alongside whistler-mode wave activity shows several distinctive characteristics: (a)—within the duct, the wave normal angles (WNA) are close to zero and the waves have relatively large amplitudes, this is expected from the classic conceptualization of ducts. (b)—at L-shells higher than the duct's location a large “shadow” is present over an extended
-
Magnetic Field Enhancements in the Solar Wind: Diverse Processes Manifesting a Uniform Observation Type? J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-28 Ying-Dong Jia, Hairong Lai, Nathan Miles, Hanying Wei, Janet G. Luhmann, C. T. Russell, X. Blanco-Cano, Lan Jian, Chen Shi
Within the solar wind throughout the inner heliosphere, observations reveal the presence of magnetic field enhancements accompanied by thin current sheets at varying distances from the sun and across different longitudes and latitudes. Two primary explanations have been proposed to elucidate these phenomena: Solar wind-dust interaction and interlacing flux ropes. In this study, we employ multi-fluid
-
Properties of Mars' Dayside Low-Altitude Induced Magnetic Field and Comparisons With Venus J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-26 Susanne Byrd, Zachary Girazian, Suranga Ruhunusiri
Mars and Venus have atmospheres but lack intrinsic dipole magnetic fields. Consequently, the solar wind interaction at each planet results in the formation of an induced magnetosphere. Our work aims to compare the low-altitude (< 250 km) component of the induced magnetic field at Venus and Mars using observations from Pioneer Venus Orbiter and Mars Atmosphere and Volatile EvolutioN. We restrict the
-
Auroral Characteristics Related to AU&AL Indices J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-28 Chen Wu, Aaron J. Ridley
Auroral images of the N2 Lyman-Birge-Hopfield emissions from Polar Ultraviolet Imager (UVI) for 1.5 years are used to investigate the auroral characteristics related to the AU and AL indices that represent the directly driven and unloading processes in the solar wind-magnetosphere-ionosphere coupling, respectively. Findings include: (a) Growing AL mainly relates to the nightside aurora and tends to
-
Signature of Sudden Stratospheric Warming in the Pole and Its Antipode J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-26 Reetambhara Dutta, S. Sridharan, P. R. Sinha
In this study, the boreal sudden stratospheric warming (SSW) event of 2013 and the austral SSW event of 2019 are considered to investigate the influence of the SSW events on the polar and antipodal upper mesosphere and lower thermosphere (UMLT) regions using ground-based, space-borne, reanalysis and model data sets. During the SSW events, the solar semi-diurnal tidal (SDT) amplitudes are much larger
-
Latitude Variation of the Post-Sunset Plasma Density Enhancement During the Minor Geomagnetic Storm on 27 May 2021 J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-28 Honglian Hao, Biqiang Zhao, Yuyan Jin, Xinan Yue, Feng Ding, Guozhu Li, Wenjie Sun, Zhipeng Ren, Zishen Li
In this study, multiple instrumental observations including Global Navigation Satellite System total electron content (TEC), plasma drift velocity measured by Sanya (18.3°N, 109.6°E, dip latitude 12.6°N) Incoherent Scatter Radar (SYISR) and F2-layer peak electron density (NmF2) and peak height (hmF2) from ionosonde and SYISR have been used to investigate ionospheric responses during a minor yet highly
-
The Relationship Between the Energization of Moon-Originating Ions and Terrain Type on the Lunar Surface J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-28 Jae-Hee Lee, Khan-Hyuk Kim, Seul-Min Baek, Ho Jin, Yoshifumi Saito, Masaki N. Nishino, Shoichiro Yokota
We analyze data acquired by the Kaguya satellite on 14 October 2008 when the Moon was in the terrestrial magnetotail lobe to gain new insight into the energization of ions originating from the Moon. The Moon-originating ions were detected over a broad range of latitudes from −80° to 50° above the Moon's dayside at ∼100 km altitude. The fluxes of the Moon-originating ions were observed at energies from
-
How Solar Wind Controls the Recovery Phase Morphology of Intense Magnetic Storms J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-28 Hui Li, Xiaodong Liu, Chi Wang
Geomagnetic storms are critical space weather phenomena resulting from the interaction between the solar wind and the Earth's magnetosphere. However, most studies focus on the main phase of magnetic storms, leaving the morphology of the recovery phase an open question. In this study, we analyze 82 intense magnetic storms with the minimum Dst index ≤ −100 nT between 1995 and 2018, finding that these
-
MAVEN SWIA Observations of Solar Wind Signatures in the Collisional Atmosphere of Mars J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-28 Z. Girazian, J. Halekas, S. Ruhunusiri
At Mars, the solar wind is usually decelerated and heated at the bow shock, then diverted around the planet by the induced magnetosphere. A recent study by Crismani et al. (2019, https://doi.org/10.1029/2018ja026251), however, presented evidence of near-pristine solar wind below the exobase of Mars (<200 km) during one Mars Atmosphere and Volatile EvolutioN (MAVEN) periapsis pass, implying the solar
-
Issue Information J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-27
No abstract is available for this article.
-
Interplanetary Magnetic Field By Effects on the Strength and Latitude of Field-Aligned Currents in Different Magnetic Local Time Sectors J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-21 Hui Wang, Yu Sun, Hermann Lühr
In this work, IMF By effects on field-aligned currents (FACs) are examined in different local time sectors, seasons, and hemispheres. At dusk and 09–14 MLT, when the eastward polar electrojet (PEJ) prevails, the northern FACp (poleward side FACs) are stronger when IMF By < 0 than when IMF By > 0. Conversely, at dawn, 21–02 MLT, and 09–14 MLT with westward PEJ, the northern FACp are stronger with IMF
-
STEVE Events With FUV Emissions J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-24 Y. Zhang, B. Gallardo-Lacourt, L. J. Paxton, P. J. Erickson, M. Hairston, W. R. Coley
STEVE, Strong Thermal Emission Velocity Enhancement, was often observed by ground-based imagers in visible wavelengths and rarely detected by global FUV imagers. We present a new event, and revisit two reported STEVE events, that were observed by the DMSP/SSUSI FUV imager at O 135.6 nm, N2 LBHS, and LBHL emissions. Coincident particle and plasma drift observations showed that the events were associated
-
Constraining the Influence of Callisto's Perturbed Electromagnetic Environment on Energetic Particle Observations J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-23 Lucas Liuzzo, Andrew R. Poppe, Quentin Nénon, Sven Simon, Peter Addison
This study focuses on constraining the role that Callisto's perturbed electromagnetic environment had on energetic charged particle signatures observed during the Galileo mission. To do so, we compare data from the Energetic Particle Detector (EPD) obtained during four close encounters of the moon with a model framework that combines hybrid simulations for low-energy plasma and test-particle tracing
-
THEMIS Observations of Magnetosheath-Origin Foreshock Ions J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-20 Terry Z. Liu, Vassilis Angelopoulos, Andrew Vu, Hui Zhang, Antonius Otto, Kun Zhang
The ion foreshock, filled with backstreaming foreshock ions, is very dynamic with many transient structures that disturb the bow shock and the magnetosphere-ionosphere system. It has been shown that foreshock ions can be generated through either solar wind reflection at the bow shock or leakage from the magnetosheath. While solar wind reflection is widely believed to be the dominant generation process
-
PEMEM Percentile: New Plasma Environment Specification Model for Surface Charging Risk Assessment J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-17 S. Dubyagin, N. Ganushkina, A. Sicard, J.-C. Matéo-Vélez, L. Monnin, D. Heynderickx, P. Jiggens, G. Deprez, F. Cipriani
The Plasma Environment Modeling in the Earth's Magnetosphere (PEMEM) is a European Space Agency activity supporting the development of a new specification model for the spacecraft surface charging risk assessment. This paper presents a description of the basic model version: the PEMEM percentile model. The model is intended to be used for space missions with near-equatorial orbits. The model is based
-
Possible Global Generation Region of Nonlinear Whistler-Mode Chorus Emission Waves at Mercury J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-17 Mitsunori Ozaki, Takeru Kondo, Satoshi Yagitani, Mitsuru Hikishima, Yoshiharu Omura
Chorus waves are a kind of intense electromagnetic emission wave in magnetized planets and can play important roles in the kinetic electron dynamics in planetary magnetospheres. Rapid changes of the ring electron current belt in Mercury’s magnetosphere and the contribution of chorus waves have remained long-standing scientific issues from the first Mercury flyby observations by Mariner 10 in 1970s
-
Simultaneous Occurrence of Traveling Ionospheric Disturbances, Farley Buneman and Gradient Drift Instabilities Observed by the Zhongshan SuperDARN HF Radar J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-17 Alicreance Hiyadutuje, John Bosco Habarulema, Michael J. Kosch, Xiangcai Chen, Judy A. E. Stephenson, Tshimangadzo Merline Matamba
We show that Traveling Ionospheric Disturbances (TIDs) may affect the Farley Buneman Instability (FBI) and Gradient Drift Instability (GDI) echoes referred to as the Near Range Echoes (NREs) in the SuperDARN radar backscatter from the lower part of the E-region. TIDs and NREs are observed concomitantly by the Zhongshan SuperDARN radar (69.38°S, 76.38°E) in the far and near ranges, respectively. At
-
Checking Key Assumptions of the Kennel-Petschek Flux Limit With ELFIN CubeSats J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-14 D. Mourenas, A. V. Artemyev, X.-J. Zhang, V. Angelopoulos
In planetary radiation belts, the Kennel-Petschek flux limit is expected to set an upper limit on trapped electron fluxes at 80–600 keV in the presence of efficient electron loss through pitch-angle diffusion by whistler-mode chorus waves generated around the magnetic equator by the same 80–600 keV electron population. Comparisons with maximum measured fluxes have been relatively successful, but several
-
Retrieval of Thermospheric O and N2 Densities From ICON EUV J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-13 Richard M. Tuminello, Andrew W. Stephan, Scott L. England
As activity in Earth orbit continues to grow, it is important to characterize the environment of near-Earth space. One means of remotely sensing lower thermospheric neutrals is by measurement of O and N2 density through the observation of far-ultraviolet (FUV) airglow of atomic oxygen at 135.6 nm and the N2 Lyman-Birge-Hopfield (LBH) bands (~130–180 nm), as has been done on the Ionospheric Connection
-
Relativistic Electron Precipitation Driven by Mesoscale Transients, Inferred From Ground and Multi-Spacecraft Platforms J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-13 A. V. Artemyev, X.-J. Zhang, A. G. Demekhov, X. Meng, V. Angelopoulos, Yu. V. Fedorenko
Precipitation of relativistic electrons into the Earth's atmosphere regulates the outer radiation belt fluxes and contributes to magnetosphere-atmosphere coupling. One of the main drivers of such precipitation is electron scattering by whistler-mode waves. Such waves typically originate at the equator, where they can resonate with and scatter sub-relativistic (tens to a few hundred keV) electrons.
-
Controlling Factors of the Seasonal Variation of the Latitudinal Location of the Equatorial Ionization Anomaly Crest J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-13 Jing Liu, Donghe Zhang, Quanhan Li, Yaoyu Tian, Anthea Coster, Yongqiang Hao, Zuo Xiao
The latitudinal location of the Equatorial Ionization Anomaly (EIA) crest has seasonal variation, and there are disagreements on the interpretation of such seasonal characteristic in previous studies. Some studies suggested that this seasonal characteristic is determined by the seasonal characteristic of the equatorial electric field. Others suggested that this seasonal characteristic is determined
-
On the Two Approaches to Incorporate Wave-Particle Resonant Effects Into Global Test Particle Simulations J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-07 A. S. Lukin, A. V. Artemyev, X.-J. Zhang, O. Allanson, X. Tao
Energetic electron dynamics in the Earth's radiation belts and near-Earth plasma sheet are controlled by multiple processes operating on very different time scales: from storm-time magnetic field reconfiguration on a timescale of hours to individual resonant wave-particle interactions on a timescale of milliseconds. The most advanced models for such dynamics either include test particle simulations
-
Propagation of Very Oblique Chorus Waves Near a Plasmaspheric Plume Boundary J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-11 Wenyao Gu, David Hartley, Xu Liu, Lunjin Chen, Jacob Bortnik, Richard B. Horne
In a case study using Van Allen Probe B, we investigate chorus wave observations near the western edge of a plasmaspheric plume characterized by steep density gradients. Initially, wave vectors are oriented anti-Earthward, but they become very oblique and eastward as the probe approaches the plume boundary. Treating the plume boundary as an azimuthal density gradient, ray tracing can reproduce the
-
Characterization of Magnetic Flux Contents for Two Flux Transfer Events From Both In Situ and Ionospheric Observations J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-07 Shuo Wang, Ying Zou, Qiang Hu, Xueling Shi, Hiroshi Hasegawa
Flux transfer events (FTEs) are a type of magnetospheric phenomena that exhibit distinctive observational signatures from the in situ spacecraft measurements. They are generally believed to possess a magnetic field configuration of a magnetic flux rope and formed through magnetic reconnection at the dayside magnetopause, sometimes accompanied with enhanced plasma convection in the ionosphere. We examine
-
Ion Acceleration and Corresponding Bounce Echoes Induced by Electric Field Impulses: MMS Observations J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-09 Xing-Yu Li, Zhi-Yang Liu, Qiu-Gang Zong, Xu-Zhi Zhou, Jian-Jun Liu, Ze-Jun Hu, Xing-Xin Zhao, Yi-Xin Hao, Ying Liu, Fan Yang, Craig J. Pollock, Christopher T. Russell, Per-Arne Lindqvist
Dayside magnetosphere interactions are essential for energy and momentum transport between the solar wind and the magnetosphere. In this study, we investigate a new phenomenon within this regime. Sudden enhancements of ion fluxes followed by repeating dropouts and recoveries were observed by Magnetospheric Multiscale on 5 November 2016, which is the very end of the recovery phase from a moderate geomagnetic
-
Seasonal and Interannual Variations of Global Tides in the Mesosphere and Lower Thermosphere Neutral Winds: II. Semidiurnal and Terdiurnal Tides J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-12 Yangkun Liu, Jiyao Xu, A. K. Smith, Xiao Liu
In the mesosphere and lower thermosphere (MLT) region, semidiurnal and terdiurnal tides are dominant at middle and high latitudes and are important for the dynamics and structures. Using the global neutral horizontal wind data in the MLT region observed by TIMED Doppler interferometer from 2002 to 2021, the seasonal and interannual variations of six semidiurnal and terdiurnal tidal components (SW2
-
Plasma Observations in the Distant Magnetotail During Intervals of Northward IMF J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-11 M. K. Mooney, S. E. Milan, G. E. Bower
We examine a 6-day traversal of the magnetotail by the ARTEMIS satellites during an interval of prolonged northward IMF. The electrostatic analyzer (ESA) onboard the ARTEMIS spacecraft measures high ion and electron fluxes at approximately 60 RE downtail in regions of the magnetotail which would normally be the magnetotail lobe, containing open flux evacuated of plasma. We interpret these observations
-
Statistical Studies of Plasma Structuring in the Auroral Ionosphere by the Swarm Satellites J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-11 L. M. Buschmann, L. B. N. Clausen, A. Spicher, M. F. Ivarsen, W. J. Miloch
This study uses over 2 years of 16 Hz density measurements, 50 Hz magnetic field data and ROTI data from the Swarm mission to perform long term statistics of plasma structuring in the polar ionosphere. The timeframe covers more than 2 years near the 24th solar cycle peak. We additionally use 3 years of data obtained from a timeframe close to solar minimum for discussion. We present power spectral densities
-
Superthermal Electron Observations at Mars During the December 2022 Disappearing Solar Wind Event J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-11 Shaosui Xu, David L. Mitchell, Jasper Halekas, David A. Brain, Tristan Weber, Laila Andersson, Skylar Shaver, Abigail Azari, James P. McFadden, Kathleen Hanley, Yingjuan Ma, Christina Lee, Gina A. DiBraccio, Christian Mazelle, Shannon M. Curry
On 26–27 December 2022, Mars experienced an extremely low-density solar wind stream, which was encountered first by Earth because of the radial alignment of the two planets (i.e., Mars opposition). During this event, two important properties of the ionospheric and magnetospheric states changed significantly in response to the low solar wind ram pressure, as inferred from the superthermal electron observations
-
Evening Solar Terminator Waves in Earth's Thermosphere: Neutral Wind Signatures Observed by ICON-MIGHTI J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-11 L. Claire Gasque, Brian J. Harding, Thomas J. Immel, Yen-Jung Wu, Colin C. Triplett, Sharon L. Vadas, Erich Becker, Astrid Maute
The moving solar terminator (ST) generates atmospheric disturbances, broadly termed solar terminator waves (STWs). Despite theoretically recurring daily, STWs remain poorly understood, partially due to measurement challenges near the ST. Analyzing Michelson Interferometer for Global High-resolution Thermospheric Imaging (MIGHTI) data from NASA's Ionospheric Connection Explorer (ICON) observatory, we
-
Simulating Long-Term Dynamics of Radiation Belt Electrons Using DREAM3D Model J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-11 Sang-Yun Lee, Weichao Tu, Gregory S. Cunningham, Misa M. Cowee, Dedong Wang, Yuri Y. Shprits, Michael G. Henderson, Geoffrey D. Reeves
We compared the performance of DREAM3D simulations in reproducing the long-term radiation belt dynamics observed by Van Allen Probes over the entire year of 2017 with various boundary conditions (BCs) and model inputs. Specifically, we investigated the effects of three different outer boundary conditions, two different low-energy boundary conditions for seed electrons, four different radial diffusion
-
Evidence for a Current System and Potential Structure in the Martian Magnetotail J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-06 Murti Nauth, David L. Mitchell, Christopher M. Fowler, Imke de Pater, Abigail R. Azari
We present a case study of plasma and magnetic field observations in the Martian magnetotail using data from the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission during an orbit when the spacecraft was in the optical shadow, past the dusk terminator and downstream of the strongest crustal magnetic fields. In this region, we observed multiple magnetic field rotations (a signature of currents)
-
Occurrence Probability of Magnetic Field Disturbances Measured With Swarm: Mapping the Dynamic Magnetosphere-Ionosphere Coupling J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-06 Margot Decotte, Karl M. Laundal, Spencer M. Hatch, Jone P. Reistad
The exchange of kinetic and electromagnetic energy by precipitation and/or outflow and through field-aligned currents are two aspects of the ionosphere-magnetosphere coupling. A thorough investigation of these processes is required to better understand magnetospheric dynamics. Building on our previous study using the Defense Meteorological Satellite Program spectrometer data, here we use Swarm vector
-
Ionospheric Conductances Due To Electron and Ion Precipitations: A Comparison Between EISCAT and DMSP Estimates J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-06 Xin Wang, Lei Cai, Anita Aikio, Heikki Vanhamäki, Ilkka Virtanen, Yongliang Zhang, Bingxian Luo, Siqing Liu
Energetic particle precipitation is the major source of electron production that controls the ionospheric Pedersen and Hall conductances at high latitudes. Many studies use empirical formulas to estimate conductances. The particle precipitation spectra measured by the Defense Meteorological Satellite Program (DMSP) Special Sensor J are often used as the input to the empirical formulas. In this study
-
Magnetic Local Time and Interplanetary Magnetic Field By Variation of Cusp Location Dependence on Dipole Tilt J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-05 Phillip C. Anderson, Aaron L. Bukowski
We produced a database of over 41,000 ionospheric cusp locations using 40 years of energetic particle measurements from 14 Defense Meteorological Satellite Program (DMSP) satellites. We limited the database to periods when the Auroral Electrojet (AE) was <100 nT and the Interplanetary Magnetic Field (IMF) measurements were available, then calculated the magnetic latitude (MLAT), magnetic local time
-
Seasonal and Interannual Variations of Global Tides in the Mesosphere and Lower Thermosphere Neutral Winds: I. Diurnal Tides J. Geophys. Res. Space Phys. (IF 2.8) Pub Date : 2024-02-05 Yangkun Liu, Jiyao Xu, A. K. Smith, Xiao Liu
In the mesosphere and lower thermosphere, diurnal tides are responsible for the dynamics and structures at low latitudes since they have largest amplitudes there. Based on the 20-year (2002−2021) observations from Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics Doppler interferometer (TIDI), we investigate the seasonal variations of three diurnal tidal components (DW1, DE3, DW2), and their