Radial and longitudinal development of a substorm in the near tail: Geotail-GOES conjunction event

Physics

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2731 Magnetosphere: Outer, 2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2764 Plasma Sheet, 2788 Storms And Substorms

Scientific paper

Near 0700 UT on November 21, 2001, an isolated substorm took place. Fortuitously, Geotail was in the equatorial plane at a radial distance of 9.6 Re near 22.6 MLT, and four GOES spacecraft were all in the night sector; GOES 10 at 22.4 MLT, GOES 9 at 0.5 MLT, GOES 12 at 1.3 MLT, and GOES 8 at 2.5 MLT. The first signal of an onset is earthward and duskward plasma flows at Geotail. Within a few minutes, an increase in Bz starts with rapid field fluctuation. The field intensity reaches its maximum value within 10 minutes. After the end of this dipolarization, ion temperature increases. After the field is almost dipolarized at 9.6 Re, rapid field variations start in the magnetic field at 6.6 Re. The field becomes rather taillike and then a dipolarization proceeds. A significant decrease in H (the northward component) occurs at 22.4 MLT when the field is almost dipolarized at 0.5 MLT. The dipolarization is delayed progressively in the morning sector. Hence, this event provides us a unique opportunity to understand relationships among various onset signatures in the near-Earth magnetotail.

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