Results 71 to 80 of about 221 (134)

Sub‐MeV Electron Precipitation Driven by EMIC Waves: New Insights From CIRBE/REPTile‐2 Measurements

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract Electromagnetic ion cyclotron (EMIC) waves are recognized as a key driver of relativistic (>1 MeV) electron loss in Earth's magnetosphere. Growing evidence also suggests that EMIC wave can efficiently scatter sub‐MeV electrons, although the precise energy range and the underlying physical mechanisms remain debated.
Zheng Xiang, Xinlin Li, Daniel N. Baker, Declan O’Brien, Yang Mei, Ziye Zhang, Theodore Sarris, Michael A. Temerin   +7 more
wiley   +1 more source

First Observation of Sawtooth‐Like Undulations in Afternoon Detached Auroral Arcs Modulated by Surface Waves at the Plasmaspheric Plume Boundary

AGU Advances, Volume 7, Issue 3, June 2026.
Abstract The afternoon detached auroral arc is an important phenomenon in the subauroral region, reflecting coupling processes between the Earth's magnetosphere and ionosphere. Previous studies have not identified fine‐scale structures in such arcs, leaving the dynamics underlying their formation poorly understood.
Huiting Feng, Dedong Wang, Yixin Hao, Yoshizumi Miyoshi, Haobo Fu, Chae‐Woo Jun, Yuzhang Ma, Yongliang Zhang, Kazushi Asamura, Yoshiya Kasahara, Shoya Matsuda, Atsuki Shinbori, Fuminori Tsuchiya, Atsushi Kumamoto, Ayako Matsuoka, Mariko Teramoto, Kazuhiro Yamamoto, Iku Shinohara, Kazuo Shiokawa, Yuri. Y. Shprits   +19 more
wiley   +1 more source

Observations of the ionospheric projection of the plasmapause

Geophysical Research Letters, 2008
We demonstrate a method for extracting the ionospheric projection of the plasmapause (PP) from DMSP measurements of the H+ density in the topside ionosphere. The results agree well with PP locations derived from images of the plasmasphere acquired by the IMAGE spacecraft during a 72‐day period in 2001.
P. C. Anderson, W. R. Johnston, J. Goldstein   +2 more
openaire   +1 more source

Identifying the Magnetospheric Drivers of Giant Undulations: Global Modeling of the Evolving Inner Magnetosphere and Its Auroral Manifestations

Geophysical Research Letters
We present the first global geospace simulation to reproduce auroral giant undulations (GUs). To identify their magnetospheric drivers, we employ the MAGE (Multiscale Atmosphere‐Geospace Environment) model in a case study of a geomagnetic storm for which
K. A. Sorathia, M. Shumko, A. Sciola, A. Michael, V. G. Merkin, B. Gallardo‐Lacourt, M. G. Henderson, D. Lin, S. Bao, J. Garretson, A. Y. Ukhorskiy   +10 more
doaj   +1 more source

Giant Undulations Driven by Pitch‐Angle Scattering of Time Domain Structures Modulated by Plasmapause Surface Wave

Geophysical Research Letters
Plasmapause surface waves (PSWs) near the plasmapause boundary are regarded to be the magnetospheric source of ionospheric auroral giant undulations (GUs) located at the equatorward boundary of diffuse aurora.
Yi‐Jia Zhou, Pei‐Heng Du, Jian Liu, Quan‐Qi Shi, Meng‐Dan Guo, Fei He, Xiao‐Xin Zhang, Yong‐Liang Zhang, Zhong‐Hua Yao, Jun Zhong, Zhaojin Rong, Yong Wei   +11 more
doaj   +1 more source

ULF Wave Characteristics in the Auroral Zone through the Plasmapause

Antarctic Record, 1979
Geomagnetic pulsations in the auroral zone through the plasma-pause were examined on the basis of IMS observation data obtained in Canada. It was shown that the geomagnetic pulsations in the daytime are reasonably accounted for in terms of HM waves ...
Kanji HAYASHI, Takashi OGUCHI, Susumu KOKUBUN, Koichiro TSURUDA, Tomiya WATANABE, R. E. HORITA   +5 more
doaj   +1 more source

Plasmapause undulation of 17 April 2002

Geophysical Research Letters, 2004
We report IMAGE EUV observations of a striking undulatory motion of the plasmapause that occurred on 17 April 2002, in which a large ripple propagated westward across the duskside plasmapause. From the plasmapause motion we infer a peak E‐field of ≈3 mV/m associated with the undulation, and estimate the undulation's equatorial azimuthal speed to be 0.9
J. Goldstein, B. R. Sandel, M. R. Hairston, S. B. Mende   +3 more
openaire   +1 more source

Inner Magnetospheric Oxygen Torus Induced by Electromagnetic Ion Cyclotron Waves

Geophysical Research Letters
Cold oxygen ions escaping from the ionosphere and temporarily trapped near the plasmapause form the oxygen torus. Mass‐loading by these oxygen ions significantly affects magnetospheric plasma processes.
Zhiyong Wu, Zhenpeng Su, Huinan Zheng, Yuming Wang   +3 more
doaj   +1 more source

Spatial Evolution Characteristics of Plasmapause Surface Wave During a Geomagnetic Storm on 16 July 2017

Geophysical Research Letters
Boundary dynamics are crucial for the transport of energy, mass, and momentum in geospace. The recently discovered plasmapause surface wave (PSW) plays a key role in the inner magnetosphere dynamics.
Yi‐Jia Zhou, Fei He, Martin O. Archer, Xiao‐Xin Zhang, Y. X. Hao, Zhong‐Hua Yao, Zhaojin Rong, Yong Wei   +7 more
doaj   +1 more source

Characteristics of VLF Saucers Observed by ISIS-1, 2 Satellites

Antarctic Record, 1979
Characteristics of the saucer emissions are studied by using ISIS VLF data which were received at Syowa Station by the wintering party of the 17th Japanese Antarctic Research Expedition in 1976-1977. Saucers were observed most frequently in the nighttime
Takayuki OZAKI, Masayuki IWASE, Takeo YOSHINO, Toshiro MATSUO, Hiroshi FUKUNISHI   +4 more
doaj   +1 more source