Results 71 to 80 of about 4,523 (241)

Revealing the Formation of the <20 MeV Inner Proton Radiation Belt at L ∼ 2 During the 10–11 May 2024 Superstorm

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract A new proton radiation belt was identified during the geomagnetic superstorm of 10–11 May 2024. To investigate its origin, we use an MHD‐test particle simulation to model solar energetic proton (SEP) trapping and the evolution of the initial trapped proton population during the storm.
Murong Qin, Mary K. Hudson, Miles Engel, Brian T. Kress, Zhao Li, Maulik Patel, Wen Li, Kevin Pham, William R. Johnston, Xinlin Li, Shawn Young   +10 more
wiley   +1 more source

On the triggering of auroral substorms by northward turnings of the interplanetary magnetic field [PDF]

, 2009
Some studies over the last decade have indicated that the instability responsible for substorm expansion phase onset may require an external trigger such as a northward turning of the interplanetary magnetic field (IMF). Statisti- cal investigations have
Wild, J.A., Morley, S.K., Woodfield, E.E., S. K. Morley, E. E. Woodfield, J. A. Wild   +5 more
core   +1 more source

Open Magnetic Field Lines Partition Auroral Oval Segments Into Transpolar Arcs

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract Transpolar arcs (TPAs) are auroral structures spanning the polar cap. One type appears in conjugate hemispheres and is thought to be located on closed field lines, but how closed flux enters the open polar cap remains debated. We address this using observation and simulation of conjugate TPAs after an interplanetary magnetic field (IMF) By ...
Xin‐Ming Chen, Zan‐Yang Xing, Qing‐He Zhang, Hui‐Gen Yang, L. R. Lyons, K. Oksavik, Yong‐Liang Zhang, S. E. Milan, Xiang‐Yu Wang, Yu‐Zhang Ma, Yong Wang, Lu Sheng, Duan Zhang, Zhi‐Feng Xiu, Bian‐Long Zhao   +14 more
wiley   +1 more source

CUTLASS/IMAGE observations of high latitude convection features during substorms [PDF]

, 1997
International audienceThe CUTLASS Finland HF radar has been operational since February 1995. The radar frequently observes backscatter during the midnight sector from a latitude range 70?75° geographic, latitudes often associated with the polar cap ...
T.K Yeoman, T. K. Yeoman, H Lühr, H. Lühr (7615595), Lühr, H., H. Lühr, Yeoman, T. K., Yeoman, T.K., T. K. Yeoman (7601525)   +8 more
core   +1 more source

How the Relative Contribution of DP‐1 and DP‐2 Currents Reshapes the Global Current System During Substorms

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract Geomagnetic disturbances in polar regions can be decomposed into two main patterns: the Disturbance Polar (DP) 1 and 2. How their relative contribution reshapes global current system remains unclear. In this study, we classified substorms from 2010 to 2022 into weak and strong DP‐2 events based on the ratio of the eastward to westward auroral ...
Jiarong Ma, Chao Yue, Haobo Fu, Shan Wang, Qiugang Zong, Xuzhi Zhou   +5 more
wiley   +1 more source

A superposed epoch analysis of auroral evolution during substorms: Local time of onset region [PDF]

, 2010
peer reviewedPrevious workers have shown that the magnetic local time (MLT) of substorm onset depends on the prevailing east-west component of the interplanetary magnetic field (IMF).
Hubert, Benoît, Hubert, B., S. E. Milan, Milan, S. E., B. Hubert (7590023), A. Grocott, B. Hubert, Grocott, A., S. E. Milan (7594526), A. Grocott (7601519)   +9 more
core   +1 more source

Nitric Oxide Intensification Associated With STEVE: TIMED/SABER‐REGO Observations and Comparison With GITM Simulation

AGU Advances, Volume 7, Issue 3, June 2026.
Abstract Strong Thermal Emission Velocity Enhancement (STEVE) is a nightsky optical phenomenon of great research interest in recent years. STEVE is recognized to be co‐located with a latitudinally narrow channel of fast westward ion drifts, also known as “subauroral ion drifts” (SAID).
Jun Liang, C. Sheng, B. Kunduri, B. J. Harding, M. Mlynczak, E. Donovan, E. Spanswick, D. M. Gillies   +7 more
wiley   +1 more source

Interhemispheric observations of the ionospheric signature of tail reconnection during IMF-northward non-substorm intervals [PDF]

, 2005
This paper presents the first interhemispheric radar observations interpreted as the ionospheric response to tail reconnection during IMF-northward non-substorm intervals.
S. W. H. Cowley, T. K. Yeoman, S. E. Milan, Cowley, S. W. H., Milan, S. E., A. Grocott, Yeoman, T. K., Grocott, A.   +7 more
core   +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

Multi-instrument observations of the electric and magnetic field structure of omega bands [PDF]

, 2000
High time resolution data from the CUTLASS Finland radar during the interval 01:30±03:30 UT on 11 May, 1998, are employed to characterise the ionospheric electric field due to a series of omega bands extending ~5° in latitude at a resolution of 45 km in ...
Eglitis, P., J. A. Wild (7591442), T. K. Yeoman, P. Eglitis (7605143), P. Eglitis, H. J. Opgenoorth, H. J. Opgenoorth (7618256), Wild, J. A., Yeoman, T. K., J. A. Wild, T. K. Yeoman (7601525), Opgenoorth, H. J.   +11 more
core   +1 more source