Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm53a1436f&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM53A-1436
Physics
2790 Substorms
Scientific paper
Substorms have been an important part of magnetospheric studies for the past 40 years. However, the recovery phase has been relatively neglected compared to the much greater analyzed growth and expansion phases. From an observational viewpoint the recovery phase begins with the decay of the electrojet or the substorm current wedge in the near-Earth tail (this being the maximum in the AE index) [Baker et al., 1996]. As put forth by Baker et al. [1999], one of the main questions regarding the recovery phase is, "why does it start when it does?" When the recovery phase begins, there is generally still free energy remaining in the lobes that could conceivably be transported earthward through reconnection at the neutral line; yet some process forces the substorm and energy transport to diminish. Baumjohann et al. [1999], suggests that the recovery phase begins when the dipolarization front moves tailward and encounters the near-Earth neutral line, thus causing it to move tailward. In this work, we analyze the Lyon-Fedder-Mobarry MHD simulation of a substorm event to identify the processes that initiate the substorm recovery phase. We examine how the dipolarization front moves and how energy is transported from the lobes. We compare the simulation output to observations from Cluster and Polar to verify that the simulation captures the accurate picture of the substorm recovery phase.
Baker Daniel N.
Farr N.
Wiltberger Michael
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