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  • Study of Coronal Mass Ejections Succeeding the Associated X-Ray and γ-Ray Burst Solar Flares
    Earth Moon Planets (IF 0.609) Pub Date : 2020-07-21
    Walid Abdel-Sattar, Ramy Mawad

    This study is dedicated to the investigation of the characteristics of CMEs following the associated X-ray and γ-ray burst solar flares. Investigated 14786 CME events and 5092 Gamma Burst Monitor (GBM) solar flare events recorded during the solar period 2008–2017, found 503 (about 10%) CME events associated with GBM post-flare events (hereafter, GBM post-flare—CME). All of these 503 events (100%) are

    更新日期:2020-07-21
  • Exposure Ages, Noble Gases and Nitrogen in the Ordinary Chondrite Karimati (L5)
    Earth Moon Planets (IF 0.609) Pub Date : 2020-07-13
    Ramakant R. Mahajan

    Noble gas and nitrogen isotopic compositions of Karimati ordinary (L5) chondrite are presented. Aliquots of the meteorite were studied in two noble gas mass spectrometers. Its cosmic ray exposure (CRE) history, trapped noble gases and nitrogen isotopic systematic are examined. The compositions of Ne and Kr in this meteorite indicate presence of mixture of solar wind and Q trapped components. In addition

    更新日期:2020-07-13
  • Statistical Characteristics on SEPs, Radio-Loud CMEs, Low Frequency Type II and Type III Radio Bursts Associated with Impulsive and Gradual Flares
    Earth Moon Planets (IF 0.609) Pub Date : 2020-07-11
    P. Pappa Kalaivani, A. Shanmugaraju, O. Prakash, R.-S. Kim

    We have statistically analyzed a set of 115 low frequency (Deca-Hectometer wavelengths range) type II and type III bursts associated with major Solar Energetic Particle (SEP: Ep > 10 MeV) events and their solar causes such as solar flares and coronal mass ejections (CMEs) observed from 1997 to 2014. We classified them into two sets of events based on the duration of the associated solar flares:75 impulsive

    更新日期:2020-07-13
  • The Subjectivity in Identification of Martian Channel Networks and Its Implication for Citizen Science Projects
    Earth Moon Planets (IF 0.609) Pub Date : 2020-02-19
    R. S. Bahia, M. Jones

    The Martian surface is incised by numerous valley networks, which indicate the planet experienced sustained widespread flowing water in the past (e.g. Carr in Water on Mars, Oxford University Press, New York, 1996; Phil Trans R Soc A 370:2193–2212, 2012. https://doi.org/10.1098/rsta.2011.0500). Examining the distribution and geometries of these valley networks provides invaluable information about

    更新日期:2020-02-19
  • HCO+ in the coma of comet Hale-Bopp.
    Earth Moon Planets (IF 0.609) Pub Date : 1997-01-01
    A J Lovell,F P Schloerb,E A Bergin,J E Dickens,C H Devries,M C Senay,W M Irvine

    Maps of comet C/1995 O1 (Hale-Bopp) in the millimeter-wave emission of the ion HCO+ revealed a local minimum near the nucleus position, with a maximum about 100,000 km in the antisolar direction. These observed features of the HCO+ emission require a low abundance of HCO+ due to enhanced destruction in the inner coma of the comet, within a region of low electron temperature (Te). To set constraints

    更新日期:2019-11-01
  • Collisional quenching of OH radio emission from comet Hale-Bopp.
    Earth Moon Planets (IF 0.609) Pub Date : 1997-01-01
    F P Schloerb,C H Devries,A J Lovell,W M Irvine,M Senay,H A Wootten

    Observations of comets in the 18-cm OH transitions offer a means to probe gas production, kinematics, and OH excitation in comets. We present initial results of OH observations of comet Hale-Bopp obtained with the NRAO 43 m antenna located in Greenbank, WV. Maps of the emission provide strong constraints on the amount of quenching of the inversion of the OH ground state A-doublet in the coma. Analysis

    更新日期:2019-11-01
  • The HNC/HCN ratio in comets.
    Earth Moon Planets (IF 0.609) Pub Date : 1997-01-01
    W M Irvine,J E Dickens,A J Lovell,F P Schloerb,M Senay,E A Bergin,D Jewitt,H E Matthews

    The abundance ratio of the isomers HCN and HNC has been investigated in comet Hale-Bopp (C/1995 O1) through observations of the J = 4-3 rotational transitions of both species for heliocentric distances 0.93 < r < 3 AU, both pre- and post-perihelion. After correcting for the optical depth of the stronger HCN line, we find that the column density ratio of HNC/HCN in our telescope beam increases significantly

    更新日期:2019-11-01
  • Video observations, atmospheric path, orbit and fragmentation record of the fall of the Peekskill meteorite.
    Earth Moon Planets (IF 0.609) Pub Date : 1996-02-01
    Z Ceplecha,P Brown,R L Hawkes,G Wetherill,M Beech,K Mossman

    Large Near-Earth-Asteroids have played a role in modifying the character of the surface geology of the Earth over long time scales through impacts. Recent modeling of the disruption of large meteoroids during atmospheric flight has emphasized the dramatic effects that smaller objects may also have on the Earth's surface. However, comparison of these models with observations has not been possible until

    更新日期:2019-11-01
  • The delivery of organic matter from asteroids and comets to the early surface of Mars.
    Earth Moon Planets (IF 0.609) Pub Date : 1996-01-01
    G J Flynn

    Carbon delivered to the Earth by interplanetary dust particles may have been an important source of pre-biotic organic matter (Anders, 1989). Interplanetary dust is shown to deliver an order-of-magnitude higher surface concentration of carbon onto Mars than onto Earth, suggesting interplanetary dust may be an important source of carbon on Mars as well.

    更新日期:2019-11-01
  • Comets, meteorites and atmospheres.
    Earth Moon Planets (IF 0.609) Pub Date : 1996-01-01
    T Owen,A Bar-Nun

    The relatively low value of Xe/Kr in the atmospheres of Earth and Mars seems to rule out meteorites as the major carriers of noble gases to the inner planets. Laboratory experiments on the trapping of gases in ice forming at low temperatures suggest that comets may be a better choice. It is then possible to develop a model for the origin of inner planet atmospheres based on volatiles delivered by comets

    更新日期:2019-11-01
  • Surficial geology of the Chicxulub impact crater, Yucatan, Mexico.
    Earth Moon Planets (IF 0.609) Pub Date : 1993-01-01
    K O Pope,A C Ocampo,C E Duller

    The Chicxulub impact crater in northwestern Yucatan, Mexico is the primary candidate for the proposed impact that caused mass extinctions at the end of the Cretaceous Period. The crater is buried by up to a kilometer of Tertiary sediment and the most prominent surface expression is a ring of sink holes, known locally as cenotes, mapped with Landsat imagery. This 165 +/- 5 km diameter Cenote Ring demarcates

    更新日期:2019-11-01
  • The distribution of solar flares and probable relations to biological effects.
    Earth Moon Planets (IF 0.609) Pub Date : 1991-10-01
    B Petropoulos,C Poulakos

    We have compared the monthly distribution of the total number of flares to the monthly mortality from cardiovascular and myocardial infarctions for the time period 1974-1983, and computed correlation coefficients. Periodicities of 3 and 5 months (150 days) have been found in both distributions.

    更新日期:2019-11-01
  • The first 800 million years: environmental models for early Earth.
    Earth Moon Planets (IF 0.609) Pub Date : 1987-01-01
    G Arrhenius

    Space exploration has changed our views not only on the properties of celestial bodies and the interplanetary medium but also our perspective on the formation of such bodies, including the Earth. However, on few points do the new hetegonic insights approach certainty. More appropriately, they can be said to raise physically meaningful questions and to decrease the degrees of freedom allowable in any

    更新日期:2019-11-01
  • Solar Eclipses and the Surface Properties of Water
    Earth Moon Planets (IF 0.609) Pub Date : 2019-09-30
    Elmar C. Fuchs, Gerrit Oudakker, Martin Justinek, Nigel Dyer, Jakob Woisetschläger, Kevin Godines, Matthias Mäder, Friedemann T. Freund

    During four solar eclipse events (two annular, one total and one partial) a correlation was observed between a change in water surface tension and the magnitude of the optical coverage. During one eclipse, evaporation experiments were carried out which showed a reduction in water evaporation at the same time as a rise in the surface tension. The changes did not occur on a day without a solar eclipse

    更新日期:2019-09-30
  • Dark Matter Objects: Possible New Source of Gravitational Waves
    Earth Moon Planets (IF 0.609) Pub Date : 2019-09-14
    C. Sivaram, Kenath Arun

    Gravitational waves from mergers of black holes and neutron stars are now being detected by LIGO. Here we look at a new source of gravitational waves, i.e., a class of dark matter objects whose properties were earlier elaborated. We show that the frequency of gravitational waves and strains on the detectors from such objects (including their mergers) could be within the sensitivity range of LIGO. The

    更新日期:2019-09-14
  • Superfast Exoplanets and 9600 s
    Earth Moon Planets (IF 0.609) Pub Date : 2019-07-15
    V. A. Kotov

    Motion of a substantial part of the superfast exoplanets is found to be in the close resonance with the well-known “solar” timescale \(P_{0} \approx 0.11\) days and/or the timescale 2\(P_0\)/\(\pi \approx 0.07\) days (at 99.9% confidence for exoplanet periods \(P < 2\) days). There is also a noticeable lack of the exoplanetary “unstable” orbits with \(P \approx 3 \pi\)\(P_0\)\(\,\approx 1.05\) days

    更新日期:2019-07-15
  • Arecibo ALFA Array Observations in Search of Lunar Meteoroid-Strike EMPs
    Earth Moon Planets (IF 0.609) Pub Date : 2019-05-29
    Saiveena Kesaraju, John D. Mathews, Phil Perillat

    We present the preliminary results of a search for transient Electromagnetic Pulses (EMP) associated with the impact of meteoroids on the lunar surface as observed with the Arecibo Observatory ALFA (Arecibo L-band Feed Array) system. The ALFA system is a cluster of seven, dual-linear polarization feeds/beams arranged in a hexagonal manner and operated in the protected L-band region centered at 1.41 GHz

    更新日期:2019-05-29
  • Primordial Planets Predominantly of Dark Matter
    Earth Moon Planets (IF 0.609) Pub Date : 2019-05-17
    C. Sivaram, Kenath Arun, O. V. Kiren

    Cosmic structure formation is thought to occur as a bottom-up scenario, i.e. the lightest objects would have formed first. It has been suggested that the earliest structures to form could have been primordial planets. Here we propose the possibility of formation of primordial planets at high redshifts composed predominantly of dark matter (DM) particles, with planetary masses ranging from Neptune mass

    更新日期:2019-05-17
  • A Catalog of Smaller Planets
    Earth Moon Planets (IF 0.609) Pub Date : 2019-05-14
    Barton Paul Levenson

    A compilation was made of N = 89 planets or moons for which the mass and radius are known, between the limits of 0.01 and 10 times the mass of Earth. Although starting from a larger and higher-quality (because it excludes m sin i figures) sample than that of Weiss and Marcy (Astrophys J Lett 783:L6–L12, 2014), the chart of log density versus radius confirms the WM14 results: Density increases up to

    更新日期:2019-05-14
  • Distinction in the Interplanetary Characteristics of Accelerated and Decelerated CMEs/Shocks
    Earth Moon Planets (IF 0.609) Pub Date : 2018-12-05
    K. Suresh, A. Shanmugaraju, Y.-J. Moon

    A set of 58 Coronal Mass Ejections (CMEs) with different kinematics near the sun in LASCO Field of view (FOV) is classified into two groups (i) CMEs which are accelerating (group-I) and (ii) CMEs which are decelerating (group-II). We analyze their interplanetary propagation characteristics to study the distinction between these two groups of events. Some of the following deviations are noted between

    更新日期:2018-12-05
  • Photometric Study of Comet C/2014 S2 (PANSTARRS) After the Perihelion
    Earth Moon Planets (IF 0.609) Pub Date : 2018-11-21
    A. S. Betzler, O. F. de Sousa, L. B. S. Betzler

    We analyzed the BVR photometry of comet C/2014 S2 obtained between March and June 2016, in observatories installed in Europe and the United States. Using the Lomb–Scargle periodogram, we found that the most probable periodicity deduced from the V-band magnitudes is 2.70 days, suggesting that it is the period of rotation of the nucleus of this comet is \(2.70 \pm 0.07\) days or \(68 \pm 2\) h, with

    更新日期:2018-11-21
  • Jerk in Planetary Systems and Rotational Dynamics, Nonlocal Motion Relative to Earth and Nonlocal Fluid Dynamics in Rotating Earth Frame
    Earth Moon Planets (IF 0.609) Pub Date : 2018-10-03
    Rami Ahmad El-Nabulsi

    Some results following from the implications of nonlocal-in-time kinetic energy approach introduced recently by Suykens in the framework of rotational dynamics and motion in a non-inertial frame are discussed. Their roles in treating aspects concerning the nonlocal motion relative to Earth, the free-fall problem, the Foucault pendulum and the motion of a massive body in a rotating tube are analyzed

    更新日期:2018-10-03
  • Fast Spinning of Planets
    Earth Moon Planets (IF 0.609) Pub Date : 2018-09-29
    V. A. Kotov

    Spin periods of Jupiter, Saturn, Uranus and Neptune are specified by the analysis of the resonant motion of large satellites: \(P = 0.445(2)\,\hbox {d}\), 0.448(1) d, 0.673(9) d and 0.561(7) d, respectively. They occur to be near-commensurate with \(P_0=9600.606(12)\,\hbox {s}\), the period of the “cosmic” oscillation, discovered first in the Sun, then in other variable objects of the Universe. The

    更新日期:2018-09-29
  • The Temperature Regime of the Proposed Landing Sites for the Luna-Glob Mission in the South Polar Region of the Moon
    Earth Moon Planets (IF 0.609) Pub Date : 2018-08-10
    E. A. Feoktistova, S. G. Pugacheva, V. V. Shevchenko

    In this paper, we investigated the possibility of existence of the hydrogen-containing volatile compounds, similar to those found in the Cabeus crater, in the area of the proposed landing ellipses of the Luna-Glob mission. We found that the existence of water ice and other hydrogen-containing substances is possible only in the presence of a shielding layer of regolith. The time of existence of such

    更新日期:2018-08-10
  • A New Simple Model of Comets-Like Activity of Centaurs
    Earth Moon Planets (IF 0.609) Pub Date : 2018-07-26
    M. Wesołowski, P. Gronkowski

    Outbursts and variations of brightness are well known manifestations of the physical activity of the comets. Most cometary outbursts are recorded not very far from the Sun, where sublimation of water ice plays a major role in the activity of this celestial bodies. However, comets sometimes show physical activity far from the Sun, where the rate of water ice sublimation is small. Also a special kind

    更新日期:2018-07-26
  • Landing Area Selection Based on Closed Environment Avoidance from a Single Image During Optical Coarse Hazard Detection
    Earth Moon Planets (IF 0.609) Pub Date : 2018-07-23
    Ruoyan Wei, Jianwei Jiang, Xiaogang Ruan, Jianke Li

    The success of a landed space exploration depends largely on the final landing site, and the most important factor of landing site selection is the safety of lander, so, hazard detection and avoidance are crucial during asteroid landing. Many approaches have been proposed at present, most of them just detect hazard and select an area that is free of hazard threaten, however, in some cases, the selected

    更新日期:2018-07-23
  • Incoherent Scatter Radar Studies of Daytime Plasma Lines
    Earth Moon Planets (IF 0.609) Pub Date : 2018-03-13
    Frank T. Djuth, Herbert C. Carlson, Liwei D. Zhang

    First results from wideband (electron phase energies of 5–51 eV), high-resolution (0.1 eV) spectral measurements of photoelectron–enhanced plasma lines made with the 430 MHz radar at Arecibo Observatory are presented. In the F region, photoelectrons produced by solar EUV line emissions (He II and Mg IX) give rise to plasma line spectral peaks/valleys. These and other structures occur within an enhancement

    更新日期:2018-03-13
  • Remote Sensing of Mars: Detection of Impact Craters on the Mars Global Surveyor DTM by Integrating Edge- and Region-Based Algorithms
    Earth Moon Planets (IF 0.609) Pub Date : 2018-03-12
    C. D. Athanassas, A. Vaiopoulos, P. Kolokoussis, D. Argialas

    This study integrates two different computer vision approaches, namely the circular Hough transform (CHT) and the determinant of Hessian (DoH), to detect automatically the largest number possible of craters of any size on the digital terrain model (DTM) generated by the Mars Global Surveyor mission. Specifically, application of the standard version of CHT to the DTM captured a great number of craters

    更新日期:2018-03-12
  • The Central Symmetry Analysis of Wrinkle Ridges in Lunar Mare Serenitatis
    Earth Moon Planets (IF 0.609) Pub Date : 2018-03-09
    Meijuan Yao, Jianping Chen

    Wrinkle ridges are one of the most common structures usually found in lunar mare basalts, and their formations are closely related to the lunar mare. In this paper, wrinkle ridges in Mare Serenitatis were identified and mapped via high-resolution data acquired from SELENE, and a quantitative method was introduced to analyze the degree of central symmetry of the wrinkle ridges distributed in a concentric

    更新日期:2018-03-09
  • Patterns Formation in a Self-Gravitating Isentropic Gas
    Earth Moon Planets (IF 0.609) Pub Date : 2017-12-27
    Mayer Humi

    In this paper we consider a hydrodynamic model for the matter density distribution in a self gravitating, isentropic 2-d disk of gas where the isentropy coefficient is allowed to be a function of position. For this model we prove analytically the existence of steady state and time dependent solutions in which the matter density in the disk is oscillatory and pattern forming. This research is motivated

    更新日期:2017-12-27
  • Automated Meteor Detection by All-Sky Digital Camera Systems
    Earth Moon Planets (IF 0.609) Pub Date : 2017-12-02
    Tomáš Suk, Stanislava Šimberová

    We have developed a set of methods to detect meteor light traces captured by all-sky CCD cameras. Operating at small automatic observatories (stations), these cameras create a network spread over a large territory. Image data coming from these stations are merged in one central node. Since a vast amount of data is collected by the stations in a single night, robotic storage and analysis are essential

    更新日期:2017-12-02
  • Hamiltonian Formulation and Perturbations for Dust Motion Around Cometary Nuclei
    Earth Moon Planets (IF 0.609) Pub Date : 2017-10-27
    Yu Jiang, Juergen Schmidt, Hexi Baoyin, Hengnian Li, Junfeng Li

    In this paper we analyze the dynamical behavior of large dust grains in the vicinity of a cometary nucleus. To this end we consider the gravitational field of the irregularly shaped body, as well as its electric and magnetic fields. Without considering the effect of gas friction and solar radiation, we find that there exist grains which are static relative to the cometary nucleus; the positions of

    更新日期:2017-10-27
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