Correlation of plasma and field behaviors in the near-Earth magnetotail with substorm injections

Details Correlation of plasma and field behaviors in the near-Earth magnetotail with substorm injections Correlation of plasma and field behaviors in the near-Earth magnetotail with substorm injections

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm71a0578h&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM71A-0578

Other

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

Scientific paper

We have investigated statistically correlation of plasma flows, energization, and field variations observed by the Geotail spacecraft with particle injections observed at geosynchronous orbit. For this study, we visually inspected both Geotail and the Los Alamos National Laboratory (LANL) geosynchronous satellites data during Apr., 1995 - Mar., 2001 and have identified 50 conjunction events in which Geotail observed the near-Earth plasma sheet (-5 Re > X > -17 Re) when LANL observed dispersionless injection of energetic particles at geosynchronous distance on the nightside. We have made a superposed epoch analysis of plasma and field variations in the near-Earth plasma sheet by referring to the time of the associated dispersionless injections. The result is that, in all of the cases where Geotail and LANL are located closely in the dawn-dusk direction (|dY| < 3 Re), Geotail observed a gradual |Bx| increase prior to the injection time and then observed a sharp decrease in |Bx| as well as a rapid Bz increase around the injection time. These field signatures are consistent with the field stretching during the growth phase and subsequent dipolarization associated with a substorm onset. In addition to the field signatures, flux enhancements of energetic (>30 keV) ions and electrons are also observed in most of the cases when Geotail reenters the plasma sheet as expected from the thickening of the plasma sheet after onset. On the other hand, in the cases in which Geotail and LANL are separated azimuthally from each other (|dY| > 3 Re), the |Bx| increase prior to the injection time is not seen clearly and the Bz increase tends to be less sharp and smaller than those in the former cases. This result suggests that the thinning and subsequent thickening of the plasma sheet occurs more markedly at the injection sector and such a change in the field configuration becomes weaker away from there. We have also examined the spatial evolution in the X-Y plane of the region of dipolarization and their relative timings in detail. It is found that a substantial part of dipolarization events occur first around the injection sector about one minute before the corresponding injections, and subsequently they propagate azimuthally fairly fast (~ 1 min) toward the other local time sectors.

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