Results 281 to 290 of about 405,081 (406)

Uncertainties in Theoretical Chorus Chirping Rates: A Comparative Analysis

Geophysical Research Letters, Volume 52, Issue 12, 28 June 2025.
Abstract Whistler‐mode chorus waves play a critical role in the dynamics of energetic electrons in the inner magnetosphere. Extensive theoretical research has been conducted to explain the frequency chirping of chorus waves, with two primary theoretical chirping rates proposed: one associated with magnetic field inhomogeneity and the other linked to ...
Zeyin Wu, Shangchun Teng, Yifan Wu, Xin Tao   +3 more
wiley   +1 more source

Electric Field Measurements Made in Space

Geophysical Research Letters, Volume 52, Issue 12, 28 June 2025.
Abstract The operating principles of a DC and low frequency electric field detector are developed, after which, examples of earlier important electric field measurements are presented, including, the first observation of parallel electric fields in the auroral acceleration region, the first observation of time domain structures in space, the first ...
F. S. Mozer, O. V. Agapitov
wiley   +1 more source

Estimation of Spacecraft Angular Velocity Based on the Optical Flow of Star Images Using an Optimized Kalman Filter. [PDF]

Biomimetics (Basel)
Si J, Niu Y, Niu H, Liu Z, Liu D.
europepmc   +1 more source

Protection of spacecraft from meteoroids and orbital debris

, 1986
A.P. Fraas
openalex   +1 more source

Ion Escape From Degenerate Induced Magnetospheres: The Case of Mars

Geophysical Research Letters, Volume 52, Issue 12, 28 June 2025.
Abstract When the cone angle of the interplanetary magnetic field (IMF) becomes small, induced magnetospheres of unmagnetized planets degenerate. Using hybrid simulations, we study ionospheric ion escape in a 4° cone angle case and compare it with the nominal 55° cone angle (Parker spiral) case. The total escape rate is 1.7×1025 $1.7\times 1{0}^{25}$ s−
Qi Zhang, Stas Barabash, Mats Holmström, Xiao‐dong Wang, Yoshifumi Futaana, Christopher M. Fowler, Robin Ramstad, Hans Nilsson   +7 more
wiley   +1 more source

Near‐Zero Thermal Expansion in Coordination Polymer Cd(1,2,4‐Triazole)2(H2PO4)2

Angewandte Chemie, Volume 137, Issue 25, June 17, 2025.
The structural dynamics and the chemical bonding origin of a volumetric near‐zero thermal expansion in a coordination polymer across 25 K to 400 K is studied using multi‐temperature X‐ray crystallography and X‐ray electron density analysis. The lattice expansion in the a and c directions is counteracted by contraction along b axis, caused by concerted ...
Sounak Sarkar, Bo Brummerstedt Iversen
wiley   +2 more sources

Rethinking planetary protection: an island biogeographical analysis. [PDF]

J R Soc Interface
Brener DJ, Cockell CS.
europepmc   +1 more source

Interplay Between a Foreshock Bubble and a Hot Flow Anomaly Forming Along the Same Rotational Discontinuity

Geophysical Research Letters, Volume 52, Issue 12, 28 June 2025.
Abstract Solar wind directional discontinuities can generate transient mesoscale structures such as foreshock bubbles and hot flow anomalies (HFAs) upstream of Earth's bow shock. These structures can have a global impact on near‐Earth space, so understanding their formation conditions is essential.
Lucile Turc, Martin O. Archer, Hongyang Zhou, Yann Pfau‐Kempf, Jonas Suni, Primož Kajdič, Xóchitl Blanco‐Cano, Souhail Dahani, Markus Battarbee, Savvas Raptis, Terry Z. Liu, Hui Zhang, C. Philippe Escoubet, Adrian T. LaMoury, Shi Tao, Veera Lipsanen, Yufei Hao, Minna Palmroth   +17 more
wiley   +1 more source

Energy Transport and Conversion Above a Bright Discrete Auroral Arc. [PDF]

J Geophys Res Space Phys
Chaston CC.
europepmc   +1 more source

Streamer‐Like Red Line Diffuse Auroras Driven by Time Domain Structures Associated With Electron Injection and Braking Ion Flows

Geophysical Research Letters, Volume 52, Issue 12, 28 June 2025.
Abstract Auroral streamers are important meso‐scale processes that transport plasma and magnetic energy and drive dynamic magnetosphere‐ionosphere (MI) coupling and space weather. Although streamers are typically studied using imagers sensitive to energetic (> ${ >} $1 keV) electron precipitation, such as all‐sky imagers, some are associated with low ...
Yangyang Shen, Xu Zhang, Jun Liang, Anton Artemyev, Vassilis Angelopoulos, Emma Spanswick, Larry Lyons, Yukitoshi Nishimura   +7 more
wiley   +1 more source