GEOTAIL observations of total pressure and electric field variations in the near and mid-distant tail associated with substorm onsets

Details GEOTAIL observations of total pressure and electric field variations in the near and mid-distant tail associated with substorm onsets GEOTAIL observations of total pressure and electric field variations in the near and mid-distant tail associated with substorm onsets

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..639m&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 6, p. 639-642

Physics

Plasma Physics

21

Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Storms And Substorms, Space Plasma Physics: Magnetic Reconnection

Scientific paper

Selecting 263 substorm events with Pi 2 pulsation, we have statistically-investigated temporal variations in the total pressure and the electric field (E=-V×B) in the near-Earth magnetotail with GEOTAIL data. It was found that a total pressure decrease occurs first in the premidnight region around (X,Y)~(-18,7)RE in the GSM coordinates about 1 or 2 min before onset, and propagates to the surrounding regions successively. The dawn-to-dusk electric fields around X~-10RE and X~-28RE have the same magnitudes and develop considerably about 1 min after onset, while that around (X,Y)~(-20,5)RE is smaller. These results strongly suggest that the magnetic reconnection takes place at least 2 min earlier than the dipolarization, and that, on the average, the center of the energy release is initially located around the premidnight region of (X,Y)~(-19,6)RE.

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