Results 71 to 80 of about 6,471 (197)

Dynamic Test Particle Simulations of X‐Ray Emissions at Dayside Magnetopause Under Time‐Varying Solar Wind Conditions

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract The Latmos Test Particle (LaTeP) model is a steady‐state test particle code to investigate the solar wind charge exchange soft X‐ray emissions of the steady‐state Earth magnetosphere. In this study, we present the development of a new dynamic version (D‐LaTeP) extending the LaTeP model to adapt to time‐varying solar wind conditions.
Qiuyu Xu, Dimitra Koutroumpa, Ronan Modolo, Binbin Tang   +3 more
wiley   +1 more source

The response of exospheric neutral hydrogen to weak geomagnetic disturbances between June 12 and 29, 2008

Frontiers in Astronomy and Space Sciences
Stereoscopic remote sensing observations of terrestrial far ultraviolet (Lyman-α at 121.6 nm) emissions at solar minimum have been used to retrieve the time-dependent response of the exospheric 3-D neutral hydrogen (H) density at radial distances of 3–6 ...
Jochen H. Zoennchen, Gonzalo Cucho-Padin, Gonzalo Cucho-Padin   +2 more
doaj   +1 more source

Analytical model of Europa’s O2 exosphere

Planetary and Space Science, 2016
Abstract The origin of the exosphere of Europa is its water ice surface. The existing exosphere models, assuming either a collisionless environment (simple Monte Carlo techniques) or a kinetic approach (Direct Monte Carlo Method) both predict that the major constituent of the exosphere is molecular oxygen. Specifically, O2 is generated at the surface
MILILLO, Anna, PLAINAKI, CHRISTINA, DE ANGELIS, Elisabetta, MANGANO, VALERIA, MASSETTI, Stefano, MURA, Alessandro, ORSINI, Stefano, RISPOLI, ROSANNA   +7 more
openaire   +2 more sources

Characteristics of Helium Bulges and the Impact of Martian Year 34 Global Dust Storm Using MAVEN/NGIMS Observations and MarsPCM and MGITM Simulations

Journal of Geophysical Research: Planets, Volume 130, Issue 12, December 2025.
Abstract We investigate spatiotemporal characteristics of helium (He) bulges using data from the Neutral Gas and Ion Mass Spectrometer aboard NASA's Mars Atmosphere and Volatile EvolutioN Mission and numerical simulations from the Mars Planetary Climate Model (MarsPCM). During equinoxes, we observed a He bulge at equatorial latitudes in addition to the
Neha Gupta, Bijay Kumar Guha, Claus Gebhardt, Shaikha Al Dhaheri, Stephen Bougher, Roland M. B. Young, Ehouarn Millour, Luca Montabone, N. V. Rao, Piyush Sharma   +9 more
wiley   +1 more source

Radiation Transport Through the Martian Atmosphere as a Function of the Zenith Angle

Journal of Geophysical Research: Planets, Volume 130, Issue 12, December 2025.
Abstract The topographic influence of the radiation environment on the Martian surface radiation is crucial for future human exploration. Topographic maps help assess radiation flux variations, aiding in hazard evaluation. Creating a global radiation map requires accounting for seasonally varying atmospheric density, heliospheric modulation, and ...
Salman Khaksari, Phillip H. Phipps, Robert F. Wimmer‐Schweingruber, Timothy J. Stubbs, Mark D. Looper, Jingnan Guo, Gabin Charpentier, Bent Ehresmann, Jan Leo Löwe, Daniel Matthiä, Donald M. Hassler, Cary Zeitlin, Sven Löffler   +12 more
wiley   +1 more source

High-energy environment of super-Earth 55 Cnc e I: Far-UV chromospheric variability as a possible tracer of planet-induced coronal rain

, 2018
The irradiation of close-in planets by their star influences their evolution and might be responsible for a population of ultra-short period planets eroded to their bare core.
Bourrier, V., Ehrenreich, D., Etangs, A. Lecavelier des, Lavie, B., Louden, T., Pepe, F., Udry, S., Vidal-Madjar, A., Wheatley, P. J., Wyttenbach, A.   +9 more
core   +2 more sources

Thermosphere and exosphere of hot Jupiters [PDF]

Proceedings of the International Astronomical Union, 2008
AbstractHere we describe the observations and the resulting constraints on the upper atmosphere (thermosphere and exosphere) of hot Jupiters. In particular, observations and theoretical modeling of hot-Jupiter evaporation are described. The observations allowed the discovery that the planet orbiting HD209458 has an extended atmosphere of escaping ...
openaire   +2 more sources

The first analysis of the outward H fluxes measured by IBEX-Lo in 20–50 RE geocentric distances

Frontiers in Astronomy and Space Sciences
In this study, we analyze the energetic neutral atom (ENA) observations measured in the lowest energy channel (10–21 eV) of the IBEX-Lo instrument on Interstellar Boundary Explorer (IBEX) during two spring seasons, day of year (DOY) 101–146, 2009, and ...
Jeewoo Park, Jeewoo Park, Hyunju K. Connor   +2 more
doaj   +1 more source

The Young Age of the LAMP‐observed Frost in Lunar Polar Cold Traps

Geophysical Research Letters, 2019
The Lunar Reconnaissance Orbiter/Lyman Alpha Mapping Project (LAMP) ultraviolet instrument detected a 0.5–2% icy regolith mix on the floor of some of the southern pole permanently shadowed craters of the Moon. We present calculations indicating that most
W. M. Farrell, D. M. Hurley, M. J. Poston, P. O. Hayne, J. R. Szalay, J. L. McLain   +5 more
doaj   +1 more source

Observed variations of the exospheric hydrogen density with the exospheric temperature

Journal of Geophysical Research, 1975
Measurements of exospheric hydrogen densities at a distance of 3 RE (earth radii) are presented as a function of exospheric temperature. They imply that the density nc at the exobase level decreases with exospheric temperature Tc but not enough to keep the Jeans escape flux FJ constant.
openaire   +2 more sources