• Earth Moon Planets (IF 0.609) Pub Date : 2020-07-21

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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• Earth Moon Planets (IF 0.609) Pub Date : 2018-10-03

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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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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