Results 1 to 10 of about 989 (165)
Stormtime substorm onsets: occurrence and flow channel triggering [PDF]
Earth, Planets and Space, 2018 Bright auroral emissions during geomagnetic storms provide a good opportunity for testing the proposal that substorm onset is frequently triggered by plasma sheet flow bursts that are manifested in the ionosphere as auroral streamers.
Larry R. Lyons +5 more
doaj +2 more sources
Probabilistic modelling of substorm occurrences with an echo state network [PDF]
Annales Geophysicae, 2023 The relationship between solar-wind conditions and substorm activity is modelled with an approach based on an echo state network. Substorms are a fundamental physical phenomenon in the magnetosphere–ionosphere system, but the deterministic prediction of ...
S. Nakano +7 more
doaj +1 more source
Electron precipitation characteristics during isolated, compound, and multi-night substorm events [PDF]
Annales Geophysicae, 2021 A set of 24 isolated, 46 compound, and 36 multi-night substorm events from the years 2008–2013 have been analysed in this study. Isolated substorm events are defined as single expansion–recovery phase pairs, compound substorms consist of multiple phase ...
N. Partamies +8 more
doaj +1 more source
Earth and Planetary Physics, 2021 With conjunction observations of electromagnetic fields and plasma from Time History of Events and Macroscale Interactions during Substorm (THEMIS) in the near-Earth magnetotail, we investigate the spatial and temporal properties of substorm ...
SuPing Duan +3 more
doaj +1 more source
Alternating bursts of low energy ions and electrons near the substorm onset [PDF]
Annales Geophysicae, 2006 The substorm associated behavior of the low energy particles (30 eV–28.5 keV) near the earthward edge of the plasma sheet is examined using data from CRRES during the late growth and early expansion phases of a substorm on 12 March ...
T. V. Kozelova +4 more
doaj +1 more source
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
openaire +3 more sources
Multiple magnetic dipolarizations observed by THEMIS during a substorm [PDF]
Annales Geophysicae, 2011 The magnetic field dipolarization in the vicinity of substorm onset and during substorm expansion phase during the period of 06:00–06:40 UT on 15 February 2008 is investigated with observations from multiple probes of THEMIS.
S. P. Duan +4 more
doaj +1 more source
The efficiency of mechanisms driving Subauroral Polarization Streams (SAPS) [PDF]
Annales Geophysicae, 2011 We have investigated the seasonal and diurnal variation of SAPS (Subauroral Polarization Streams) occurrence based on 3663 SAPS events identified in DMSP ion drift observations in the Northern Hemisphere during July 2001 and June 2003.
H. Wang, H. Lühr
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Statistical properties of substorms during different storm and solar cycle phases [PDF]
Annales Geophysicae, 2013 Substorm properties during different storm phases have been studied using an automated recognition of substorm and storm phases in the auroral electrojet (AL) and ring current (Dst) index data from 1995–2009.
N. Partamies +4 more
doaj +1 more source
The high latitude convection response to an interval of substorm activity [PDF]
Annales Geophysicae, 1996 On 17 March 1991, five clear substorm onsets/intensifications took place within a three hour interval. During this interval ground-based data from the EISCAT incoherent scatter radar, a digital CCD all sky camera, and an extensive array of ...
T. K. Yeoman, M. Pinnock
doaj +1 more source