Physics
Scientific paper
Apr 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11600i31m&link_type=abstract
Journal of Geophysical Research, Volume 116, CiteID A00I31
Physics
2
Magnetospheric Physics: Substorms, Magnetospheric Physics: Plasma Convection (2463), Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Magnetospheric Configuration And Dynamics
Scientific paper
Recently, a revised auroral substorm onset sequence has been proposed, in which onset is preceded by a poleward boundary intensification (PBI) and subsequent equatorward propagation of N-S-aligned auroral features to breakup arc latitudes. We reanalyzed 20 randomly selected samples of the Nishimura et al. (2010) 251-event database and show in greater detail to what degree the observed features in this subset of events are consistent with the proposed scenario. To assess the sensitivity of space-based imagers for seeing this scenario, we calibrated the absolute responsivity of the THEMIS ground-based imagers. We also show that although not suitable for studies from apogee, IMAGE/FUV imagers can also observe a consistent scenario from a lower altitude. We conclude that in some cases PBIs and subsequent plasma flows can be effective in providing a trigger if the inner magnetosphere is ready to produce a substorm.
Angelopoulos Vassilis
Frey Harald U.
Mende Stephen B.
Nishimura Yasuhiro
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