Results 41 to 50 of about 6,414 (152)

Galileo PLS Plasma Observations During the E12 Europa Flyby Refuting an Encounter With a Cryovolcanic Plume

Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.
Abstract During Galileo's closest (“E12”) flyby of Europa, a brief burst of wave activity was recorded by the plasma wave instrumentation, PWS. This was speculatively interpreted by Jia et al. (2018, https://doi.org/10.1038/s41550‐018‐0450‐z) as a 2,100 cm−3 spike in plasma densities from a water plume encounter. While the plasma instrument, PLS, could
William. R. Paterson, Glyn. A. Collinson
wiley   +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

JWST Discovers the Vertical Structure of Uranus' Ionosphere

Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.
Abstract On 19 January 2025, the James Webb Space Telescope (JWST) program # $\mathrm{\#}$5073 observed Uranus for almost a full rotation with NIRSpec. We present the first ever vertical ionospheric profiles of H3+ ${\mathrm{H}}_{3}^{+}$ temperature, volumetric density and total emission.
Paola I. Tiranti, H. Melin, L. Moore, E. M. Thomas, K. L. Knowles, T. S. Stallard, K. Roberts, J. O’Donoghue   +7 more
wiley   +1 more source

Laser Ablation Sampling With Low‐Power Plasma: A LA‐MIP‐MS Instrument for Spaceflight

Rapid Communications in Mass Spectrometry, Volume 40, Issue 3, 15 February 2026.
ABSTRACT Rationale Inductively coupled plasma (ICP) is a commonly used ion source for mass spectrometry‐based chemical analysis of a wide range of materials. Traditional ICP ion sources use high power (> 1000 W) and significant gas flow (> 10 L/min), rendering them unsuitable for spaceflight, as they are too resource‐intensive for planetary spacecraft.
Benjamin J. Farcy, Jacob Graham, Madeline Raith, Ricardo Arevalo Jr., Mazdak Taghioskoui, Sierra Budinoff, Amy McAdam, Jane Lee, Ryan M. Danell, Desmond A. Kaplan, Cynthia Gundersen, William F. McDonough   +11 more
wiley   +1 more source

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

Magnetospheric influence on the Moon\u27s exosphere [PDF]

, 2006
[1] Atoms in the thin lunar exosphere are liberated from the Moon\u27s regolith by some combination of sunlight, plasma, and meteorite impact. We have observed exospheric sodium, a useful tracer species, on five nights of full Moon in order to test the ...
Mendillo, M., Spence, Harlan E., Wilson, Jody K.   +2 more
core   +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

Exospheric temperature of Venus from Mariner 5 [PDF]

Symposium - International Astronomical Union, 1971
The Lyman alpha measurements made on the sunlit side of Venus by Mariner 5 showed that the distribution of the radiating hydrogen atoms was governed by two scale heights. A revised model is presented in which the inner or cold distribution is attributed to hydrogen atoms in thermal equilibrium with the thermosphere and the outer or hot distribution is ...
openaire   +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

Investigation of the daytime lunar atmosphere [PDF]

Lunar atmosphere research has tended to center on gases with predictably large sources and on those which have been identified by Apollo experiments.
Hodges, R. R., Jr.
core   +1 more source