Results 71 to 80 of about 1,980 (216)

Modeling the Delivery of Mercury's Polar Ice by a Volatile‐Rich Impact

Journal of Geophysical Research: Planets, Volume 131, Issue 5, May 2026.
Abstract Permanently shadowed regions near Mercury's poles are thought to harbor significant deposits of water ice, the origin of which remains to be conclusively determined. One leading hypothesis is that most of the water observed today may have been delivered by a relatively recent, volatile‐rich impact comparable in scale and age to that which ...
Parvathy Prem, Nancy L. Chabot, Carolyn M. Ernst, Dana M. Hurley, David B. Goldstein, Jordan K. Steckloff   +5 more
wiley   +1 more source

Solar spectral irradiance from the CODET model for studying planetary exospheres: Earth and Mars

Frontiers in Astronomy and Space Sciences
Solar variability and solar spectral irradiance (SSI) are important for studying planetary atmospheres, particularly the ionosphere–thermosphere–mesosphere (ITM) system, and planetary exospheres.
Jenny M. Rodríguez-Gómez
doaj   +1 more source

Thermal Segregation and Reddening in Europa's Double Ridges

Journal of Geophysical Research: Planets, Volume 131, Issue 5, May 2026.
Abstract Europa's double ridges often display lower albedo and redder color than their surroundings. Their unique topography may cause sublimation‐driven darkening due to illumination and self‐heating—the process of thermal segregation. We apply an advanced 3D thermophysical model, including shadowing and self‐heating through mutual exchange of ...
Kya C. Sorli, Paul O. Hayne, Lucas Lange, Sylvain Piqueux   +3 more
wiley   +1 more source

Research progress on the exosphere and its variability of terrestrial bodies

地球与行星物理论评
Exosphere is an essential component of the atmospheres of terrestrial bodies. Its structure and variability hold significant scientific values for understanding planetary material loss, atmospheric evolution, and habitability.
Wenlong Li, Hao Gu, Jun Cui, Xu Huang, Jinjin Zhao, Wenya Li   +5 more
doaj   +1 more source

Transport of Water in a Transient, Impact‐Generated Atmosphere on Mercury

Journal of Geophysical Research: Planets, Volume 131, Issue 5, May 2026.
Abstract Mercury's polar cold traps host water ice deposits that are likely populated with impact‐delivered water via Mercury's exosphere. However, Mercury's near‐sun location experiences an extremely high photodestruction rate that rapidly destroys water with a timescale of only ∼3.5 hr.
J. K. Steckloff, D. B. Goldstein, P. L. Varghese, L. M. Trafton, P. Prem   +4 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

Metallic Species in Mercury's Exosphere: EMMI/New Technology Telescope Observations

, 2009
International audienceWe performed high spectral resolution observations of Mercury's exosphere on 2005 October 30 and 31 using the European Southern Observatory-New Technology Telescope, La Silla, Chile.
Erard, S., Leblanc, François, Foellmi, C., Doressoundiram, Alain   +3 more
core   +1 more source

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

Mercury exosphere. III: Energetic characterization of its sodium component

, 2013
International audienceMercury's sodium exosphere has been observed only few times with high spectral resolution from ground based observatories enabling the analysis of the emission spectra.
Mangano, Valeria, Leblanc, François, López Ariste, Arturo, Berthelier, Jean-Jacques, Doressoundiram, Alain, Chaufray, Jean-Yves, Borin, Patrizia   +6 more
core   +1 more source