Abstract
In this work, the cases of magnetic field disturbances registered aboard the INTERBALL-Auroral Probe satellite /IMAP Magnetometer in the north mid-altitude cusp have been analyzed. Cusp subregions are investigated by the energetic particle experiments (PROMICS-3 and DOK-2) on the same spacecraft. Images from the DMSP satellite are used for a better definition of the auroral oval. Unusual cases of field-aligned current (FAC) concentration are demonstrated: (1) Strong and highly structured FACs concentrated in the dawn cusp flank; (2) FACs concentrated in a zone of diamagnetic cavity in the dusk flank of the cusp probably related to a cusp energetic particle (CEP) event. The examined cases demonstrate that these regions of concentrations of FACs connect to the outer magnetosphere.
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