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

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Article numberL08102
<mark>Journal publication date</mark>24/04/2008
<mark>Journal</mark>Geophysical Research Letters
Issue number8
Volume35
Number of pages5
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

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° < ∣θ∣ < 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.

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Copyright 2008 by the American Geophysical Union.