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Abstract
Long term remote observations of neutral winds at F-region altitudes have been performed at Thule Air Base (lat. 76.5°N, long. 69.0°W), Greenland, and Søndre Strømfjord (lat. 67.0°N, long. 50.9°W), Greenland. The former site is very close to the geomagnetic pole, while the latter site is within the polar cap for several hours each night on either side of geomagnetic midnight. Wind data corresponding to clear sky conditions and Kp ⩽ 4 were sorted according to the sign of the IMF B z component. The averaged maximum poleward flow near midnight LST was reduced by approximately one third during B z northward conditions. If the magnitude of B y was less than the magnitude of the northward B z component, then the averaged poleward flow was further reduced by one half. In addition, if B z > 5 nT, then sunward directed horizontal neutral winds were observed at the very highest latitudes near noon LST.
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