Energization of the Ring Current by Substorms [PDF]
Journal of Geophysical Research: Space Physics, 2018 AbstractThe substorm process releases large amounts of energy into the magnetospheric system, although where the energy is transferred to and how it is partitioned remains an open question. In this study, we address whether the substorm process contributes a significant amount of energy to the ring current. The ring current is a highly variable region,
J. K. Sandhu +8 more
openaire +8 more sources
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
Substorm‐Ring Current Coupling: A Comparison of Isolated and Compound Substorms [PDF]
Journal of Geophysical Research: Space Physics, 2019 AbstractSubstorms are a highly variable process, which can occur as an isolated event or as part of a sequence of multiple substorms (compound substorms). In this study we identify how the low‐energy population of the ring current and subsequent energization varies for isolated substorms compared to the first substorm of a compound event.
J. K. Sandhu +7 more
openaire +4 more sources
Association of cusp energetic ions with geomagnetic storms and substorms [PDF]
Annales Geophysicae, 2012 Energetic ions observed in the cusp have been explained as a result of processes within the magnetosphere, but also proposed as a driver of some of those same processes. This study assesses potential connections between energetic ions observed in the
J. T. Niehof +3 more
doaj +1 more source
Correlation between ground-based observations of substorm signatures and magnetotail dynamics [PDF]
Annales Geophysicae, 2005 We present a substorm event study using the four Cluster spacecraft in combination with ground-based instruments, in order to perform simultaneous observations in the ionosphere and magnetotail.
E. Borälv +12 more
doaj +1 more source
A substorm in midnight auroral precipitation [PDF]
Annales Geophysicae, 2003 DMSP F7 spacecraft observations for the whole of 1986 were used to construct the empirical model of the midnight auroral precipitation during a substorm.
V. G. Vorobjev +3 more
doaj +1 more source
SABRE observations of structured ionospheric flows during substorm expansion phase onset [PDF]
Annales Geophysicae, 1994 The irregularity velocity patterns observed by the SABRE coherent radar at substorm expansion phase onset, which is identified by magnetometer observations of Pi2 pulsations, are occasionally highly structured.
E. G. Bradshaw, M. Lester, T. B. Jones
doaj +1 more source
Statistical study of high-latitude plasma flow during magnetospheric substorms [PDF]
Annales Geophysicae, 2004 We have utilised the near-global imaging capabilities of the Northern Hemisphere SuperDARN radars, to perform a statistical superposed epoch analysis of high-latitude plasma flows during magnetospheric substorms.
G. Provan +3 more
doaj +1 more source
Statistical visualization of the Earth's magnetotail and the implied mechanism of substorm triggering based on superposed-epoch analysis of THEMIS data [PDF]
Annales Geophysicae, 2014 To investigate the physical mechanism responsible for substorm triggering, we performed a superposed-epoch analysis using plasma and magnetic-field data from THEMIS probes. Substorm onset timing was determined based on auroral breakups detected by all-
S. Machida +5 more
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Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic and auroral luminosity pulsations in the polar cap [PDF]
Annales Geophysicae, 2017 A study is undertaken into parameters of the polar auroral and geomagnetic pulsations in the frequency range 1–4 mHz (Pc5∕Pi3) during quiet geomagnetic intervals preceding auroral substorms and non-substorm background variations.
N. Yagova +12 more
doaj +1 more source