Multi-instrument observations of discrete auroral arcs propagating sunwards and equatorwards from the poleward boundary of the auroral oval in the afternoon sector

Details Multi-instrument observations of discrete auroral arcs propagating sunwards and equatorwards from the poleward boundary of the auroral oval in the afternoon sector Multi-instrument observations of discrete auroral arcs propagating sunwards and equatorwards from the poleward boundary of the auroral oval in the afternoon sector

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....7916m&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #7916

Physics

Scientific paper

On 3rd January 1998, between 1200 and 1600 UT, the Longyearbyen meridian scanning photometer (MSP) and the Ny Alesund all sky camera (ASC) observed multiple, east-west aligned discrete auroral arcs at high latitude. These arcs exhibited periodic sunwards and equatorwards propagation, originating at the poleward edge of a double auroral oval. Using CUTLASS radar, DMSP and Polar satellite and 6300 Angstrom MSP data, we infer that these structures occurred equatorwards of the convection reversal boundary and on closed field lines. We argue that discrete frequency fast mode waves propagating sunwards from the magnetotail are driving Alfvenic waves on closed field lines on the afternoon flank. Further, we suggest that the equatorwards arc propagation observed at the ionosphere may occur as a result of field line stretching, higher latitude field lines mapping deeper into the tail in the equatorial plane.

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