Multi-point observations of the inner boundary of the plasma sheet during geomagnetic disturbances

Details Multi-point observations of the inner boundary of the plasma sheet during geomagnetic disturbances Multi-point observations of the inner boundary of the plasma sheet during geomagnetic disturbances

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3517s23r&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 17, CiteID L17S23

Physics

1

Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Plasma Convection (2463), Magnetospheric Physics: Magnetosphere: Inner

Scientific paper

We report on the THEMIS and Double Star TC-1 observations at the geocentric distances of 3 < R < 8 R E during substorms on March 23, 2007. THEMIS crossed the inner boundary of the equatorial dusk-side plasma in the string-of-pearls configuration, allowing the dynamics of particle populations to be traced within time ranges from hours to 10 minutes. Observations show co-existence of the plasma sheet ion population (5 - 30 keV) with the ring current ion population (100 - 1000 keV) at 4 < R < 6 R E . The plasma sheet population was characterized by pronounced ``nose''-like dispersion with the spectral density maximum at ~10 keV. The plasma sheet boundary, defined by a sharp decrease of the ~1 keV electron flux, moved inward to R = 4 and outward back to ~8 RE within about 1 hour. Local enhancements of the plasma sheet (1 - 5 keV) electron flux with the characteristic time scale of 2 - 10 min were detected at 5 < R < 6 R E during the substorm.

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