Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm21a..01b&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SM21A-01
Physics
2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions (2431), 2764 Plasma Sheet, 2788 Magnetic Storms And Substorms (7954), 2790 Substorms
Scientific paper
Observational and numerical modeling evidence demonstrates that substorms are a global, coherent set of processes within the magnetosphere-ionosphere system. This supports the view that substorms are a configurational instability of the coupled region since the entire magnetosphere changes during the expansion phase onset. The magnetosphere progresses through a specific sequence of energy-loading and stress- developing states until the entire system suddenly reconfigures. Present-day MHD models are seen to produce substorm-like global instabilities even if they do not treat fully the extremely thin current sheets that play an essential role in the near-tail dynamics prior to substorm onset. Continuing research concerning the substorm onset location and mechanisms addresses important questions of when and exactly how the substorm expansion develops. In this paper we focus on the largely unsolved issues associated with the recovery phase of substorms wherein the system returns toward the ground state. We present MHD simulations of several specific events that have been observed with the Cluster, THEMIS, Polar, and various geostationary orbit (operational) spacecraft.
Baker Daniel N.
Farr N.
Wiltberger Michael J.
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