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Some Statistical Characteristics of Substorms Under Northward IMF Conditions [PDF]
Journal of Astronomy and Space Sciences, 2009 While substorms are known to generally occur under southward IMF conditions, they can sometimes occur even under northward IMF conditions. In this paper, we studied the substorms that occurred in May, 2000 to 2002 to examine some statistical ...
Ji-Hee Lee +3 more
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Statistical analysis of ionospheric potential patterns for isolated substorms and sawtooth events [PDF]
Annales Geophysicae, 2006 We present here results which contrast isolated substorms with individual sawtooth events. Sawtooth events are defined as quasi-periodic, large-amplitude oscillations in the energetic particle flux with a periodicity of 2–4 h observed at the ...
X. Cai, C. R. Clauer, A. J. Ridley
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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 +4 more
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The Predictive Capabilities of the Auroral Electrojet Index for Medium Energy Electron Precipitation
Frontiers in Astronomy and Space Sciences, 2021 The chemical imprint of the energetic electron precipitation on the atmosphere is now acknowledged as a part of the natural forcing of the climate system.
H. Nesse Tyssøy +5 more
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ECMI resonance in AKR revisited: Hyperbolic resonance, harmonics, and wave–wave interaction
Frontiers in Physics, 2023 Recapitulation of the resonance condition for the fundamental and higher electron cyclotron harmonics in the electron cyclotron maser instability (ECMI) enables radiation below and confirms the possibility of radiation in a narrow band above harmonics n &
W. Baumjohann, R. A. Treumann
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Frontiers in Astronomy and Space Sciences, 2022 The By component of the magnetic field inside the magnetosphere is positively correlated with the By component of the Interplanetary Magnetic Field (IMF).
Anders Ohma +3 more
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Are there optical differences between storm-time substorms and isolated substorms? [PDF]
Annales Geophysicae, 2010 We have performed an extensive analysis of auroral optical events (substorms) that occurred during the development of the main phase of magnetic storms.
R. A. Hoffman +3 more
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Equatorial counterelectrojets during substorms [PDF]
Journal of Geophysical Research: Space Physics, 2003 Equatorial counterelectrojet (CEJ) events are analyzed in association with changes in the interplanetary magnetic field (IMF), polar cap potential (PCP), and electric field measured in the equatorial ionosphere. In one event on 16 July 1995, the equatorial CEJ was observed at the afternoon dip equator during the recovery phase of the substorm when the ...
Kikuchi, T. +4 more
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Observed Loss of Polar Mesospheric Ozone Following Substorm‐Driven Electron Precipitation
Geophysical Research Letters, 2023 Several drivers cause precipitation of energetic electrons into the atmosphere. While some of these drivers are accounted for in proxies of energetic electron precipitation (EEP) used in atmosphere and climate models, it is unclear to what extent the ...
Keeta Chapman‐Smith +4 more
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Frontiers in Astronomy and Space Sciences, 2021 The progress of space physics is reviewed from my personal point of view, particularly how I have reached my present understanding of auroral substorms and geomagnetic storms from the time of the earliest days of space physics.
Syun-Ichi Akasofu
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