Substorm onset dynamics in the magnetotail: joint TC-1 and Cluster observation and SWMF simulation

Details Substorm onset dynamics in the magnetotail: joint TC-1 and Cluster observation and SWMF simulation Substorm onset dynamics in the magnetotail: joint TC-1 and Cluster observation and SWMF simulation

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm23a1173w&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM23A-1173

Mathematics

General Topology

2723 Magnetic Reconnection (7526, 7835), 2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2753 Numerical Modeling, 2790 Substorms

Scientific paper

This study investigates two substorm onset events with favorable constellations of spacecraft, TC-1 and Cluster, near the current sheet separated by several Earth radius. The substorms have been identified in both auroral regions. One is believed to be triggered by a northward turning of the interplanetary magnetic field (IMF), while the other occurs under generally southward IMF. For both events, Cluster was located tailward of TC-1 and observed the dipolarization at earlier times. The timing difference of dipolarization at different positions could be explained by an earthward propagation of the field disturbances from midtail to the inner magnetotail. And the earthward dipolarization front was found in one case to bounce back and forth at TC-1. The earthward propagation was accompanied by a fast earthward flow for the 21 September 2005 event, while this was not the case for the 28 September 2004 event. This suggests that substorms can be quite different from case to case due to differences in the solar wind condition and magnetotail configuration. The space weather modeling framework (SWMF) can capture the general topology of the magnetotail during these two events. However, it has predicted one of the substorm onsets about 50 minutes earlier than observations while missed out the other substorm onset totally.

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