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Interplanetary magnetic field control of fast azimuthal flows in the nightside high-latitude ionosphere

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journal contribution
posted on 2010-04-27, 15:16 authored by Adrian Grocott, Steve E. Milan, Tim K. Yeoman
SuperDARN radar data from both hemispheres for the interval January 1999 to November 2006 have been inspected for evidence of high-speed azimuthal flows in the nightside high-latitude ionosphere. In the northern hemisphere, 88% of the westward directed fast flows occurred during IMF BY negative intervals and 83% of the eastward flows occurred during IMF BY positive intervals. In the southern hemisphere 82% of the westward flows occurred during IMF BY positive intervals and 74% of the eastward flows occurred during IMF BY negative intervals. ∼74% of these fast flows occurred when the IMF was within the 30° < ∣ ∣ < 100° clock angle range and the AE index was below 150 nT. These results support the hypothesis that highly dynamic magnetospheric activitycan be associated with predominantly northward, but BY-dominated IMF driving conditions and subsequent non-substorm reconnection in a twisted magnetotail.

History

Citation

Geophysical Research Letters, 2008, 35, L08102.

Published in

Geophysical Research Letters

Publisher

American Geophysical Union (AGU)

issn

0094-8276

Copyright date

2008

Available date

2010-04-27

Publisher version

http://onlinelibrary.wiley.com/doi/10.1029/2008GL033545/abstract

Language

en

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