Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm43a1711f&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM43A-1711
Physics
2700 Magnetospheric Physics (6939), 2723 Magnetic Reconnection (7526, 7835), 2744 Magnetotail, 2753 Numerical Modeling, 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. In this work, we analyze the Lyon-Fedder- Mobarry MHD simulation of six substorm events to study the processes that govern the substorm recovery phase. We examine the magnetospheric changes from a global perspective during the substorm process by using the simulation to connect activity in the tail with ionospheric signatures as well as large scale energy flow through the system. We compare the simulation output to observations from ground magnetometers and with the Cluster spacecraft to verify that the simulation captures the accurate picture of the substorm process.
Baker Daniel N.
Farr N. L.
Wiltberger Michael
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