Results 121 to 130 of about 4,846 (203)

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

Cross‐Scale Energy Transfer at Dipolarization Front in the Earth's Magnetotail

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract Dipolarization front (DF) is a key structure for energy conversion and transport in planetary magnetotails. Although multiscale processes have been observed around DFs, quantitative analyses of cross‐scale coupling remain lacking. Here, we calculate cross‐scale transfer rate for different energy channels at a DF using Magnetospheric Multiscale
Xiujuan Ou, Zhihong Zhong, Meng Zhou, Yongyuan Yi, Binwen Ge, Runqing Jin, Qianyun Xu, Ye Pang, Xiaohua Deng   +8 more
wiley   +1 more source

The Resonant Remains of Broken Chains from Major and Minor Mergers

The Astronomical Journal
TESS and Kepler have revealed that practically all close-in sub-Neptunes form in mean-motion resonant chains, most of which unravel on timescales of 100 Myr.
Rixin Li, Eugene Chiang, Nick Choksi, Fei Dai   +3 more
doaj   +1 more source

Coupling dynamical accretion and chemical differentiation: A unified framework for the diversity of Earth and Mars

Astronomy & Astrophysics
The physical and geochemical differences between Earth and Mars provide fundamental constraints on terrestrial planet formation, yet a self-consistent framework linking dynamical and chemical aspects remains elusive.
Kong Zhihui, Liu Beibei, ZhangZhou J., Tang Haolan, Deng Zhengbin, Xia Qun-Ke, Grimm Simon L., Lee Man Hoi, Huang Yi, Qin Liping, Jiang Jonathan H.   +10 more
doaj   +1 more source

Understanding the Evolution of Molecules in Space: Implications for Astrophysics, Astrochemistry, and Astrobiology

, 2009
The past 40 years have shown that, rather than hostile and barren, space is seething with dust, ices, and molecules evolving through time by a variety of intricate chemical processes.
Allamandola, L, Bregman, J, Hanel, R, Willacy, K, Kwok, S, Cohen, M, Tielens, X, Swain, M, Sandford, S, Lord, S, Ennico, K, Cruikshank, D, Werner, M, Roellig, T, Purcell, B, Lee, T, McKelvey, M, Bicay, M, Madden, S   +18 more
core  

Quasi‐Homologous Solar Flares and Impacts on Thermospheric Density and Satellite Orbital Drag

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract Quasi‐Homologous Flaring (QHF) activity from active regions on the Sun releases intense electromagnetic radiation in recurrent bursts over extended periods. In this letter, we present the effects of recurrent impulsive extreme ultraviolet (EUV) heating on thermospheric neutral density and the resulting atmospheric drag on satellites based on ...
S. Tulasi Ram, Princy K. Dubey, S. Mondal, Denny M. Oliveira, Jayashree Bulusu, Chinmaya Nayak, D. Rout, Anil Raghav, A. P. Dimri   +8 more
wiley   +1 more source

The Rich Chemistry of Ionized Methanol With Sulfur Dioxide: Pathways to Prebiotic and Elusive Species in Earth's Atmosphere and Space

Chemistry – A European Journal, Volume 32, Issue 39, 22 October 2026.
The reaction between the methanol radical cation and sulfur dioxide is remarkably fast and forms several ionic and neutral products (HOSOH+, CH2OSO+, CH2OH+, CH2O, H2O, HSO2). The chemistry goes beyond simple proton or hydrogen transfer, revealing a close interaction between the two species, relevant to atmospheric and astrochemical environments where ...
Mauro Satta, Daniele Catone, Mattea Carmen Castrovilli, Antonella Cartoni   +3 more
wiley   +1 more source

Enhancement of Magnetic Flux Transferred to the Magnetotail Due to a Storm‐Time Kelvin‐Helmholtz Instability

Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.
Abstract Along the flank magnetopause, magnetosheath flow interfaced with the relatively stationary magnetosphere produces strong flow shears, and the Kelvin‐Helmholtz instability (KHI) occurs. When the interplanetary magnetic field (IMF) is southward, anti‐parallel day‐side reconnection and KHI can interact, which may enhance the reconnection rate as ...
Brandon L. Burkholder, Katariina Nykyri, Xuanye Ma, Lauri Holappa, Harsha Gurram, Rachel C. Rice, David Sibeck, Dinesh K. V. Radhakrishnan   +7 more
wiley   +1 more source

Strong Fractionation of Deuterium and Helium in Sub-Neptune Atmospheres along the Radius Valley

The Astrophysical Journal
We simulate atmospheric fractionation in escaping planetary atmospheres using IsoFATE , a new open-source numerical model. We expand the parameter space studied previously to planets with tenuous atmospheres that exhibit the greatest helium and deuterium
Collin Cherubim, Robin Wordsworth, Renyu Hu, Evgenya Shkolnik   +3 more
doaj   +1 more source

Differentiation, the Exception, Not the Rule: Evidence for Full Miscibility in Sub-Neptune Interiors

The Planetary Science Journal
We investigate the consequences of nonideal mixing between silicate, iron metal, and hydrogen for the structures of the cores of sub-Neptunes with implications for super-Earths and perhaps other planets formed by mixtures of silicate melt, iron metal ...
Edward D. Young, Aaron Werlen, Sarah P. Marcum, Lars Stixrude, Cornelis P. Dullemond   +4 more
doaj   +1 more source