Observations of dawn-dusk aligned polar cap aurora during the substorms of January 21, 2005

Details Observations of dawn-dusk aligned polar cap aurora during the substorms of January 21, 2005 Observations of dawn-dusk aligned polar cap aurora during the substorms of January 21, 2005

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011p%26ss...59.1551d&link_type=abstract

Planetary and Space Science, Volume 59, Issue 13, p. 1551-1558.

Computer Science

Scientific paper

A new type of polar cap aurora, dawn-dusk aligned polar cap aurora (DDAPCA), was detected during the exceptionally intense January 21, 2005 substorm (AEmax=3504 nT). The DDAPCA was located at very high latitude (>85° MLAT) in the polar cap region. As the interplanetary magnetic field (IMF) GSM By component rotated from a positive to a negative value, the DDAPCA tilt angle relative to the dawn-dusk direction rotated anticlockwise and reached ˜45°. It is speculated that the DDAPCA arises from the formation of an X-line in the distant (>80RE) tail due to polar cap magnetic field reconnection under unusually high solar wind compression conditions.

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