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Flux transport and tail dynamics during a prolonged substorm interval [PDF]
, 2006 We present multi-point observations of a substorm which took place on 29 August 2004. The near-Earth magnetotail dynamics were observed by Cluster C1 and Double Star TC1, in conjunction with observations of the Northern Hemisphere ionospheric convection ...
Watermann, J. F. +9 more
core +4 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
AKR breakup and auroral particle acceleration at substorm onset [PDF]
, 2008 The dynamical behavior of auroral kilometric radiation (AKR) is investigated in connection with auroral particle acceleration at substorm onsets using high-time-resolution wave spectrograms provided by Polar/PWI electric field observations.
Morioka, A. +10 more
core +4 more sources
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
doaj +1 more source
Towards a synthesis of substorm electrodynamics : HF radar and auroral observations [PDF]
, 2006 At 08:35 UT on 21 November 2004, the onset of an interval of substorm activity was captured in the southern hemisphere by the Far UltraViolet (FUV) instrument on board the IMAGE spacecraft. This was accompanied by the onset of Pi2 activity and subsequent
Devlin, J. C. +6 more
core +6 more sources
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
Dual HF radar study of the subauroral polarization stream [PDF]
Annales Geophysicae, 2007 The dual HF radars comprising the Tasman International Geophysical Environment Radar (TIGER) system often observe localized high-velocity F-region plasma flows (≥1500 m/s) in the midnight sector (20:00–02:00 MLT) at magnetic latitudes as low as ...
R. A. Makarevich, P. L. Dyson
doaj +1 more source
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
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
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