Results 31 to 40 of about 989 (165)

Substorms: Future of magnetospheric substorm—Storm research

Eos, Transactions American Geophysical Union, 1989
We have made good progress in revealing and understanding the great complexity of magnetospheric substorm phenomena and processes during the last two decades. In spite of such advance, however, there are several areas in which a serious attempt for new advance is required. Seven areas are identified for discussion. I would like to encourage the younger
openaire   +1 more source

Quantitative Evaluation of Energy Coupling between Quasi-Periodic Substorms and High-Speed Coronal Streams [PDF]

Journal of Astronomy and Space Sciences, 2008
It has been known that high-speed solar wind streams associated with coronal holes lead to quasi-periodic substorms that occur approximately every 2˜4 hours.
M. Y. Park, D.-Y. Lee, K. C. Kim, C. R. Choi, K. S. Park   +4 more
doaj   +1 more source

From physics of polar aurora to changes of the fundamental approaches to the physics of the magnetospheric processes

Frontiers in Astronomy and Space Sciences, 2022
One of the main problems of modern magnetospheric physics is the lack of a self-consistent explanation of the main physical processes based on the laws of plasma physics.
Elizaveta E. Antonova, Elizaveta E. Antonova   +1 more
doaj   +1 more source

Substorm detonation [PDF]

Journal of Geophysical Research: Space Physics, 1999
The rapid, Alfvénic timescale of “onset” has been an enigma ever since magnetospheric substorms were first identified. Investigators have proposed a variety of trigger mechanisms in an effort to account for the abrupt reconfiguration observed. No one mechanism clearly stands out as the single cause of substorms.
openaire   +1 more source

Universal Time Influence on Stormtime Magnetosphere Ionosphere Coupling

AGU Advances, Volume 7, Issue 2, April 2026.
Abstract The offset between Earth's magnetic and rotational axes introduces a diurnal dependence in the high‐latitude EUV exposure of the northern hemisphere (NH) and southern hemisphere (SH). This variation raises the question: Does the Universal Time (UT) of geomagnetic storm onset impact its geospace consequences?
Kalpesh Ghag, William Lotko, Kevin Pham, Dong Lin, Viacheslav Merkin, Anil Raghav, Michael Wiltberger   +6 more
wiley   +1 more source

Evolution of Energetic Proton Parallel Pressure Anisotropy at Geosynchronous Altitudes: Potential Role in Triggering Substorm Expansion Phase Onset

Geophysical Research Letters
The sequence of events associated with the triggering of energy release during substorm expansion phase onset is still not well‐understood. Oberhagemann and Mann (2020b, https://doi.org/10.1029/2019gl085271) proposed a new substorm onset mechanism, where
S. S. Babu, I. R. Mann, S. Dimitrakoudis, L. G. Ozeke, I. J. Rae, C. Forsyth, A. W. Smith   +6 more
doaj   +1 more source

If substorm onset triggers tail reconnection, what triggers substorm onset? [PDF]

Journal of Geophysical Research: Space Physics, 2012
Despite the claim that tail reconnection triggers substorm onset, there is an abundance of cases wherein substorm onset triggers tail reconnection. In such cases, the first observable precursor to onset is a periodic rippling (beads) along an equatorward auroral arc.
W. W. Liu, J. Liang, E. F. Donovan, E. Spanswick   +3 more
openaire   +1 more source

Global Impacts of Ultra‐Low‐Frequency Waves: 1. Thermospheric Responses and Traveling Atmospheric Disturbances

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract Ultra‐low‐frequency (ULF) waves cause local Thermosphere‐Ionosphere (T‐I) perturbations, but their impacts on the global T‐I system including the generation of Traveling Atmospheric Disturbances (TADs) have never been evaluated. The mechanisms responsible for the TAD generation and propagation, whether through dynamic or thermal process, are ...
Haonan Wu, Wenbin Wang, Xueling Shi, Dong Lin, Michael D. Hartinger, Joseph B. H. Baker, Shibaji Chakraborty   +6 more
wiley   +1 more source

The Shock‐Substorm of 24 September 1998: A Different Type of Substorm Trigger Onset

Geophysical Research Letters
An interplanetary shock triggered a substorm with a peak intensity SML = −1,781 nT on 24 September 1998. This is called a shock‐substorm here to differentiate it from generic substorms.
Bruce T. Tsurutani, Rajkumar Hajra, Yusuke Ebihara, Gurbax S. Lakhina, Yasuhito Narita, Karl‐Heinz Glassmeier   +5 more
doaj   +1 more source

Mesospheric and Lower Thermospheric Responses to the May 2024 Geomagnetic Storm in the Antarctic Peninsula

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract We analyze the response of mean winds and semidiurnal tides (SDTs) in the mesosphere and lower thermosphere (MLT; ∼70–110 km altitude) to the May 2024 geomagnetic super storm, based on meteor radar (MR) observations from King Sejong Station (KSS; geographic: 62.22°S, 58.78°W; geomagnetic: 53.27°S, 10.88°E) in the Antarctic Peninsula.
Byeong‐Gwon Song, In‐Sun Song, Masaru Kogure, Geonhwa Jee, Jeong‐Han Kim, Changsup Lee, Eunsol Kim, Young‐Bae Ham, Hosik Kam   +8 more
wiley   +1 more source