Field-Aligned Current Response to ICME on 11 April 1997 as Seen by Interball-Au Satellite at Mid-Altitude Cusp Magnetosphere

Details Field-Aligned Current Response to ICME on 11 April 1997 as Seen by Interball-Au Satellite at Mid-Altitude Cusp Magnetosphere Field-Aligned Current Response to ICME on 11 April 1997 as Seen by Interball-Au Satellite at Mid-Altitude Cusp Magnetosphere

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sunge...1a..77b&link_type=abstract

Sun and Geosphere, vol.1, no. 1, p. 77-81

Computer Science

Scientific paper

We present magnetograms suggestive for unusual field-aligned currents (FACs) appearance in mid-altitude cusp of the magnetosphere at height 20,000 km during ejecta on 11 April 1997. In fact FACs are different as compared with Potemra model nevertheless that current direction may coincide with the classical system. We demonstrate: (1) an appearance of two or more current sheets with opposite polarities in the dusk flank of the cusp; (2) appearance of FAC system in a comparatively large magnetic field depletion or diamagnetic cavity. The examination of energetic particles gives evidence to suppose a simultaneous formation of cusp energetic particle (CEP) event in the region of field-aligned currents and diamagnetic cavity; (3) an unusually intense FAC system is documented in the cusp during low geomagnetic activity (Kp=2), when the magnetic field disturbance was in the order of 150 nT. This result together with POLAR study [16] is more confident conclusion that the driving process for this event including the reversed convection (sunward) through the polar cap was the reconnection between interplanetary field lines and the lobe field lines.

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