The Substorm at 05:45 on October 13, 2001 Observed From the Ground, and the LANL, GOES, Polar, and Cluster Satellites

Details The Substorm at 05:45 on October 13, 2001 Observed From the Ground, and the LANL, GOES, Polar, and Cluster Satellites The Substorm at 05:45 on October 13, 2001 Observed From the Ground, and the LANL, GOES, Polar, and Cluster Satellites

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm71a0580p&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM71A-0580

Physics

2407 Auroral Ionosphere (2704), 2744 Magnetotail, 2788 Storms And Substorms

Scientific paper

The substorm at ~05:45 was not the first, last, or most intense of those observed during the first half of October 13, 2001. However the configuration of platforms noted in the title was excellent for obtaining a comprehensive view of the initiation and evolution of a substorm. The combination of Canopus ground magnetograms and Polar VIS images identified onset at 05:45:02 +/- 00:00:22 west and south of Ft. Churchill, Canada. The closest satellite, Polar, was located near geosynchronous altitude at 23:00 MLT. Polar was sampling magnetic fields and plasmas characteristic of the outer plasma sheet before 05:45 UT and characteristic of the central plasma sheet after 05:45 UT. Polar magnetometer data from below the magnetic equator and GOES 12 magnetometer data from above the magnetic equator suggest that the main currents were flowing tailward of near-geosynchronous altitude. The Cluster satellites were located at ~19 Re and ~21:00 MLT on the dusk side of the magnetotail. A coherent dispersion feature in the plasma at several of the Cluster spacecraft was observed at ~05:36 UT, when the Bz (GSM) component on all four spacecraft began decreasing. The Bz component was negative on all four Cluster spacecraft from ~05:42 to ~05:55 UT. We will present these observations and a time line of events derived from them. We will discuss how these observations agree and disagree with current ideas of the initiation and global evolution of substorms.

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