On the occurrence of auroral westward flow channels and substorm phase

Parkinson, M.L.; Dyson, P.L.; Pinnock, M.. 2006 On the occurrence of auroral westward flow channels and substorm phase. Advances in Space Research, 38 (8). 1755-1762. https://doi.org/10.1016/j.asr.2005.08.028

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Abstract/Summary

Auroral westward flow channels (AWFCs) are intense, narrow channels of westward drift overlapping the equatorward edge of the auroral oval in the pre-magnetic midnight sector. They are a close relative of the sub-auroral polarisation stream which encompasses polarisation jets, a phenomenon also known as sub-auroral ion drift events. Recent observations made with the Tasman Geospace Environment Radar (TIGER) (147.2°E, 43.4°S Geodetic; 55.0° Geomagnetic) have revealed close associations between the appearance of AWFCs and substorm onset, and their subsequent decay toward the end of recovery phase. In fact, in terms of electric field strength, they are the strongest signatures of substorms in the ionospheric convection (>50 mV m−1). In terms of electric potential difference (>10 kV), they also represent a substantial fraction of the total potential difference generated during substorms. The AWFCs exhibit a diverse range of behaviour, there being no typical event. The radar observations show that radial polarisation fields sometimes oscillate towards and away from the Earth, and bifurcate, within regions of closed flux in the magnetotail throughout substorm evolution. We have identified every AWFC observed by TIGER during the first year of operation, 2000. Simple statistical arguments imply that one, if not more, AWFC probably occurs during every substorm. AWFCs are a fundamental aspect of substorm evolution.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.asr.2005.08.028
Programmes:	BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Magnetic Reconnection, Substorms and their Consequences
ISSN:	0273-1177
Additional Information. Not used in RCUK Gateway to Research.:	Full text not available from this repository
Additional Keywords:	Ionosphere
NORA Subject Terms:	Atmospheric Sciences Space Sciences
Date made live:	10 Sep 2007 14:18 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/964

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