Results 71 to 80 of about 6,063 (251)

An evaporating planet in the wind: stellar wind interactions with the radiatively braked exosphere of GJ 436 b [PDF]

, 2016
Observations of the warm Neptune GJ 436 b were performed with HST/STIS at three different epochs (2012, 2013, 2014) in the stellar Lyman- α line. They showed deep, repeated transits that were attributed to a giant exosphere of neutral hydrogen.
V. Bourrier, A. D. Étangs, D. Ehrenreich, Yuki A. Tanaka, A. Vidotto   +4 more
semanticscholar   +1 more source

The LimPa mission: a small mission proposal to characterize the enigmatic lunar dust exosphere

Earth, Planets and Space
The lunar environment is known to be characterized by complex interactions between plasma, the exosphere, dust, and the surface. However, our understanding of the environment is limited due to the lack of experimental evidence.
Yoshifumi Futaana, Esa Kallio, Olli Knuuttila, Leo Nyman, Manabu Shimoyama, Stas Barabash   +5 more
doaj   +1 more source

Supporting Informed Shutter Operations for SMILE's SXI Using Ensemble Classifiers for Soft Proton High Flux Period Predictions

Space Weather, Volume 24, Issue 7, July 2026.
Abstract Satellite X‐ray imagers are highly vulnerable to contamination by soft protons (∼100 keV), which can trigger spurious charge‐coupled device events and force interruptions in observations. For XMM‐Newton, such contamination reduced usable science time by ∼40%.
Simon Mischel, Elena A. Kronberg, C. P. Escoubet   +2 more
wiley   +1 more source

Comparison of terrestrial exospheric hydrogen 3D distributions at solar minimum and maximum using TWINS Lyman-α observations

Frontiers in Astronomy and Space Sciences
Remote sensing observations of far-ultraviolet (FUV) emissions have been used to estimate 3D neutral hydrogen (H) density models of the terrestrial exosphere under solar minimum (2008) and solar maximum (2013 and 2015) conditions.
Jochen H. Zoennchen, Gonzalo Cucho-Padin, Gonzalo Cucho-Padin, Lara Waldrop, Hans J. Fahr   +4 more
doaj   +1 more source

QEUV vs. Other EUV Proxies: A Re‐Evaluation of Solar EUV Proxies for Thermospheric and Space Weather Investigations

Space Weather, Volume 24, Issue 7, July 2026.
Abstract F10.7, Mg II, and F30 are widely used proxies for variability in solar Extreme UltraViolet (EUV, 5–120 nm) irradiance. An alternative proxy for solar EUV variability is QEUV, an indirect measure of total solar EUV irradiance, retrieved from observations of Earth's Far UltraViolet (FUV, 120–300 nm) airglow and from empirically modeled solar EUV
F. I. Laskar, W. K. Peterson, P. C. Chamberlin, R. W. Eastes, T. E. Berger, K. R. Greer, J. S. Evans, A. W. Yau   +7 more
wiley   +1 more source

Plume and surface feature structure and compositional effects on Europa's global exosphere: Preliminary Europa mission predictions

, 2017
A Europa plume source, if present, may produce a global exosphere with complex spatial structure and temporal variability in its density and composition.
B. Teolis, D. Wyrick, A. Bouquet, B. Magee, J. Waite   +4 more
semanticscholar   +1 more source

Sodium Enrichment of Mercury's Subsurface Through Diffusion

Geophysical Research Letters
Mercury's surface undergoes large temperature gradients between day and night, which repeats periodically over the same longitudes due to its 3:2 spin‐orbit resonance.
S. Verkercke, F. Leblanc, J.‐Y. Chaufray, L. Morrissey, M. Sarantos, P. Prem   +5 more
doaj   +1 more source

Variability of Earth’s ionospheric outflow in response to the dynamic terrestrial exosphere

Frontiers in Astronomy and Space Sciences
The most abundant neutral constituent in the exospheric region (i.e., beyond ≈ 500 km altitude) is the atomic hydrogen (H); however, its density distributions predicted by physics-based models have been challenged by satellite-based observations of its ...
Mei-Yun Lin, Mei-Yun Lin, Gonzalo Cucho-Padin, Gonzalo Cucho-Padin, Pedro Oliveira, Alex Glocer, Enrique Rojas   +6 more
doaj   +1 more source

Limits on the Density of the Lunar Ionosphere: ARTEMIS Observations

The Astrophysical Journal, 2023
The Moon of our Earth has a tenuous atmosphere, known as an exosphere. The ionization of this exosphere is speculated to possibly form a weak ionosphere.
Han-Wen Shen, Jasper S. Halekas, Andrew R. Poppe   +2 more
doaj   +1 more source

New MAVEN NGIMS Mars Thermosphere Temperature Database for Short Term Variability and Long Term Trends

Earth and Space Science, Volume 13, Issue 7, July 2026.
Abstract Current Mars thermospheric temperatures databases have course temporal resolution due to either a lack of data or a need to average over several orbits of data, preventing the study of short‐term, rapid changes to the Mars thermosphere. In this study, we present a new Mars thermosphere temperature database derived from individual orbits of ...
N. B. Pickett, M. Felici, N. Jones, D. Pawlowski, P. Withers, M. Benna, S. Curry   +6 more
wiley   +1 more source