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GEOPHYSICAL RESEARCH LETTERS VOL XXXX DOI 10 1029 1 2 Multi point observations of the inner boundary of the plasma sheet during geomagnetic disturbances 1 1 2 3 A Runov V Angelopoulos N Ganushkina R Nakamura J 4 4 5 6 McFadden D Larson I Dandouras K H Glassmeier C Carr 7 A Runov Institute of Geophysics and Planetary Physics University of California Los Angeles 3845 Slichter Hall Los Angeles CA 90095 USA arunov igpp ucla edu 1 Institute of Geophysics and Planetary D R A F T April 7 2008 11 25am D R A F T X 2 3 RUNOV ET AL INNER BOUNDARY OF THE PLASMA SHEET We report on the THEMIS and Double Star TC 1 observations at the geo 4 centric distances of 3 R 8 RE during substorms on March 23 2007 5 THEMIS crossed the inner boundary of the equatorial dusk side plasma in 6 the string of pearls configuration allowing the dynamics of particle popu 7 lations to be traced within time ranges from hours to 10 minutes Observa 8 tions show co existence of the plasma sheet ion population 5 30 keV with 9 the ring current ion population 100 1000 keV at 4 R 6 RE The plasma Physics University of California Los Angeles CA 9095 USA 2 Finnish Meteorological Institute 11010 Helsinki Finland 3 Space Research Institute Austrian Academy of Sciences Graz Austria 4 Space Science Laboratory University of California Berkeley CA USA 5 CESR CNRS Toulouse France 6 Institut fu r Geophysik und Extraterrestrische Physik Technische Universita t Braunschweig Germany 7 The Blackett Laboratory Imperial College London SW7 2BW UK DRAFT April 7 2008 11 25am DRAFT X 3 RUNOV ET AL INNER BOUNDARY OF THE PLASMA SHEET 10 sheet population was characterized by pronounced nose like dispersion with 11 the spectral density maximum at 10 keV The plasma sheet boundary de 12 fined by a sharp decrease of the 1keV electron flux moved inward to R 4 13 and outward back to 8 RE within about 1 hour Local enhancements of 14 the plasma sheet 1 5 keV electron flux with the characteristic time scale 15 of 2 10 min were detected at 5 R



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