Results 21 to 30 of about 6,414 (152)

Modeling Ganymede's Surface Charging in Preparation for the JUICE Mission

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract The European Space Agency's (ESA) JUICE mission (JUpiter ICy moons Explorer) is en route to the Jovian system to characterize Ganymede's subsurface ocean. Determining the ocean's conductivity and depth requires precise measurements of its induced magnetic field at the position of JUICE.
Betty Pei‐Chun Tsai, Elias Roussos, Ronan Modolo, Mika K. G. Holmberg, Xianzhe Jia, Tom Nordheim, Sachin Alexander Reddy, Norbert Krupp, Markus Fränz, Yasuhito Narita, Christina Plainaki   +10 more
wiley   +1 more source

The MgI line: a new probe of the atmospheres of evaporating exoplanets

, 2014
Transit observations of HD209458b in the UV revealed signatures of neutral magnesium escaping the planet's upper atmosphere. The absorption detected in the MgI line provides unprecedented information on the physical conditions at the altitude where the ...
Bourrier, V., Etangs, A. Lecavelier des, Vidal-Madjar, A.   +2 more
core   +2 more sources

Surface charging of thick porous water ice layers relevant for ion sputtering experiments [PDF]

, 2016
We use a laboratory facility to study the sputtering properties of centimeter-thick porous water ice subjected to the bombardment of ions and electrons to better understand the formation of exospheres of the icy moons of Jupiter.
Brouet, Y., Galli, A., Jost, B., Poch, O., Pommerol, A., Thomas, N., Tulej, M., Vorburger, A., Wurz, P.   +8 more
core   +2 more sources

Deciphering the “Missing Xenon Paradox” in Celestial Bodies: A Multifaceted Perspective Toward Demystifying This Enigma

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract Xenon (Xe) is a heavy noble gas with intriguing chemical properties, such as having several stable isotopes and the ability to form compounds under extreme conditions. Despite the predictions based on cosmochemical models that suggest xenon should be relatively abundant in planetary reservoirs, empirical data indicate a significant depletion ...
Avinash Kumar Both, Avradip Ghosh, Chin Li Cheung   +2 more
wiley   +1 more source

Reconnaissance of the TRAPPIST-1 exoplanet system in the Lyman-$\alpha$ line [PDF]

, 2017
The TRAPPIST-1 system offers the opportunity to characterize terrestrial, potentially habitable planets orbiting a nearby ultracool dwarf star. We performed a four-orbit reconnaissance with the Space Telescope Imaging Spectrograph onboard the Hubble ...
Bolmont, E., Bourrier, V., Burgasser, A. J., de Wit, J., Ehrenreich, D., Gillon, M., Jehin, E., Queloz, D., Triaud, A. H. M. J., Wheatley, P. J.   +9 more
core   +1 more source

Auroral Emissions on Ganymede: New Constraints on Their Electron Energy Dependence

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract Auroral emissions on Ganymede provide critical insights into its magnetospheric dynamics and atmospheric composition. Using a physics‐based atmospheric model with recent atmospheric observations and laboratory measurements of electron‐impact cross‐sections, this study revisits and significantly refines the relationship between auroral emission
Xin Cao, Mika K. G. Holmberg, Caitriona M. Jackman, Hans L. F. Huybrighs, Sebastian Cervantes, Audrey Vorburger   +5 more
wiley   +1 more source

An Impacting Descent Probe for Europa and the other Galilean Moons of Jupiter [PDF]

, 2017
We present a study of an impacting descent probe that increases the science return of spacecraft orbiting or passing an atmosphere-less planetary body of the solar system, such as the Galilean moons of Jupiter.
Auster, U., Barabash, S., Galli, A., Gurvits, L. I., Hajdas, W., Jutzi, M., Lammer, H., Lasi, D., Magnes, W., Piazza, D., Thomas, N., Wieser, M., Wurz, P.   +12 more
core   +2 more sources

Small meteoroids’ major contribution to Mercury’s exosphere [PDF]

Icarus, 2014
The contribution of the meteoroid population to the generation of Mercury's exosphere is analyzed to determine which segment contributes most greatly to exospheric refilling via the process of meteoritic impact vaporization. For the meteoroid data, a differential mass distribution based on work by Grün et al.
E B, Grotheer, S A, Livi
openaire   +2 more sources

Steady Collapse of Uranus' Exosphere After 1998 to the Present Decade

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract Uranus' thermospheric temperature decreased from ∼800K in 1986 to ∼450K in 2022 as determined from observations of H3+ and H2 infrared emissions. Spitzer 2007 lower atmosphere observations do not emulate this cooling trend. Here we show that the atomic H Lyman ⍺ emission from the disk of Uranus observed by HST from 2011 to 2022 are not ...
D. Bhattacharyya, J. T. Clarke, P. Stephenson, T. Koskinen, J.‐Y. Chaufray, L. Moore, H. Melin   +6 more
wiley   +1 more source

Enhancement of Terrestrial Diffuse X-ray Emission Associated With Coronal Mass Ejection and Geomagnetic Storm

, 2011
We present an analysis of a Suzaku observation taken during the geomagnetic storm of 2005 August 23-24. We found time variation of diffuse soft X-ray emission when a coronal mass ejection hit Earth and caused a geomagnetic storm.
Ezoe, Yuichiro, Mitsuda, Kazuhisa, Miyoshi, Yoshizumi, Ohashi, Takaya, Oishi, Shihoko, Terada, Naoki, Yoshitake, Hiroshi   +6 more
core   +1 more source