Results 81 to 90 of about 604,790 (209)

Microwave Absorption in the Martian Atmosphere [PDF]

, 1976
332-336Microwave absorption in the Martian atmosphere (in the frequency range 21-117 GHz) from 0 to 185 km, has been computed. The total absorption coefficient ϒ, absorption coefficient at peak resonance frequency ϒ0, and half-width of the absorption ...
Johri, Rakesh K, Joshi, Jagdish C
core  

An ICME impact on the Martian hydrogen corona

Earth and Planetary Physics, 2020
The Martian hydrogen exosphere extends out of the bow shock, forming a "hydrogen corona". The solar wind interacts directly with the hydrogen corona. During an ICME event on 7 March 2015, the SWIA instrument onboard Mars Atmosphere and Volatile Evolution
Qi Xu, XiaoJun Xu, Qing Chang, JiaYing Xu, Jing Wang, YuDong Ye   +5 more
doaj   +1 more source

Impact Crater Hydrothermal Systems Support Rapid Microbial Enrichment and Diverse Metabolic Potential

Geobiology, Volume 24, Issue 6, November/December 2026.
ABSTRACT Impact crater hydrothermal systems, formed after asteroid and comet impacts, have been proposed as promising habitats for life on early Earth and as key targets in the search for life on planetary bodies such as Mars, since they provide liquid water and active geochemical turnover.
Sabrina M. C. Hardy, Emily J. Aguilar‐Pine, Sean Gulick, Alaa Ahmad, Brett J. Baker, Nathalie Scott, Georgina Aitolo, Naomi Felton, Charles S. Cockell   +8 more
wiley   +1 more source

Seasonal Variations of the Martian Middle‐Atmosphere CO2/Ar Ratio Inferred From MAVEN/NGIMS Observations

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract The carbon dioxide (CO2)/argon (Ar) ratio is a useful tracer of atmospheric circulation on Mars, but it remains observationally poorly constrained in the middle atmosphere, where large‐scale circulation occurs. In this study, we infer the CO2/Ar ratio at the homopause, which marks the upper boundary of the well‐mixed Martian middle atmosphere,
JunFeng Qin, Shannon Curry, Michael S. Chaffin, Yuni Lee, François Forget   +4 more
wiley   +1 more source

Passive Observation of Martian Atmosphere Using O₂(a¹Δ_g) Airglow Radiation: Forward Simulation and Wind Retrieval

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
The passive monitoring of Martian wind fields is crucial for deciphering the Martian atmosphere. With the 3 strong spectral lines in the 1.27 μm O2(a1Δg) airglow emission band, this article designs the Martian Static Wind Imaging Michelson ...
Zhengyi Chen, Biyun Zhang, Chunmin Zhang
doaj   +1 more source

MAVEN Proton Observations Near the Martian Moon Phobos: Does Phobos Backscatter Solar Wind Protons?

Geophysical Research Letters, 2022
ESA's Mars Express (MEX) may have observed twice solar wind protons backscattered by Phobos. However, these detections remain uncertain and call for an independent confirmation.
A. Deniau, Q. Nénon, N. André, C. Mazelle, A. Rahmati, C. M. Fowler, A. R. Poppe, J. P. McFadden, J. S. Halekas, E. Penou   +9 more
doaj   +1 more source

A Study of Kelvin‐Helmholtz Instability at Unmagnetized Planets by Finite Larmor Radius MHD

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract Kelvin–Helmholtz instability (KHI) at unmagnetized planetary ionopauses plays a key role in driving solar wind–ionosphere coupling and planetary ion escape. We investigate KHI using a two‐dimensional finite Larmor radius (FLR) MHD model.
Caiyi Fei, Maodong Yan, Jiuhou Lei
wiley   +1 more source

A mesoscale model for the Martian atmosphere [PDF]

Journal of Geophysical Research: Planets, 2002
The Pennsylvania State University/National Center for Atmosphere Research Mesoscale Model Version 5 (MM5) has been converted for use on Mars. Modifications are based on schemes implemented in the Geophysical Fluid Dynamics Laboratory Mars General Circulation Model (GCM).
Toigo, Anthony D., Richardson, Mark I.
openaire   +2 more sources

Unusual Enhancement in He(23S) Airglow Brightness Associated With Interplanetary Magnetic Field Northward Turnings During the 2025 New Year's Day Storm

Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.
Abstract The upper thermosphere is important in the context of space weather, but continuous monitoring of the thermosphere at high latitudes remains limited despite its strong variations associated with geomagnetic activity. Orthohelium, He(23S), is found from the upper thermosphere to lower exosphere, and is a promising tracer of atmospheric dynamics.
Takanori Nishiyama, Masato Kagitani, Noora Partamies, Daniel Whiter, Takuo T. Tsuda, Yasunobu Ogawa, Fred Sigernes   +6 more
wiley   +1 more source

Protein‐Independent Liquid–Liquid Phase Separation of Adenosine Triphosphate Under Crowded Conditions

Chemistry – A European Journal, Volume 32, Issue 38, 13 October 2026.
ATP itself is able to undergo liquid–liquid phase separation in the presence of the macromolecular crowding agent PEG and physiological ATP concentrations are sufficient for phase separation in the presence of mM Mg2+ and crowders, mimicking intracellular conditions.
Robert Dec, Wojciech Dzwolak, Roland Winter   +2 more
wiley   +1 more source