Rights statement: Copyright 2008 by the American Geophysical Union.
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Interplanetary magnetic field control of fast azimuthal flows in the nightside high-latitude ionosphere
AU - Grocott, A.
AU - Milan, S. E.
AU - Yeoman, T. K.
N1 - Copyright 2008 by the American Geophysical Union.
PY - 2008/4/24
Y1 - 2008/4/24
N2 - 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.
AB - 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.
KW - magnetosphere
KW - ionosphere
KW - dynamics
U2 - 10.1029/2008GL033545
DO - 10.1029/2008GL033545
M3 - Journal article
VL - 35
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 8
M1 - L08102
ER -