Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa21b0442l&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SA21B-0442
Physics
2731 Magnetosphere: Outer, 2744 Magnetotail, 2764 Plasma Sheet, 2778 Ring Current, 2794 Instruments And Techniques
Scientific paper
A magnetic storm commenced on April 17, 2002 with multiple local minima in the Dst index from April 17 to April 20. During this storm period, Geotail traversed the magnetotail from the midtail region near the dusk flank and mostly in the tail lobe to the near-Earth region near the dawn flank and mostly in the plasma sheet. Simultaneous observations of energetic particles at the geostationary altitude showed the feature known as `sawtooth injections' remarkably well from April 18 to April 19. This conjunction allows us to examine the magnetotail behavior in the tail lobe and the plasma sheet associated with sawtooth injections. In the tail lobe, nearly one-to-one correspondence is found between injection onset and start of southward dipping of magnetic field vector in the tail lobe, a feature which was noted previously as a substorm expansion signature in the mid-tail. In the plasma sheet, intermittent occurrences of plasma flow reversal from sunward to tailward and of magnetic field from northward to southward were found. These are substorm signatures in the plasma sheet. There was no indication of the magnetotail being driven in a relatively `steady state' in association with sawtooth injections during the storm main phase. The present findings are consistent with the idea that sawtooth injections are substorm features and that these substorms involve a large local time sector of both the inner magnetosphere and the magnetotail.
Anderson Rachel
Henderson Gideon M.
Hori Toshihiro
Lui A. T.
Matsumoto Haru
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