Observations of neutral winds in the polar cap during northward IMF

R. J. Niciejewski, T. L. Killeen, Y. Won

Research output: Contribution to journalArticlepeer-review

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 Bz component. The averaged maximum poleward flow near midnight LST was reduced by approximately one third during Bz northward conditions. If the magnitude of By was less than the magnitude of the northward Bz component, then the averaged poleward flow was further reduced by one half. In addition, if Bz > 5 nT, then sunward directed horizontal neutral winds were observed at the very highest latitudes near noon LST.

Original languageEnglish (US)
Pages (from-to)285-295
Number of pages11
JournalJournal of Atmospheric and Terrestrial Physics
Volume56
Issue number2
DOIs
StatePublished - Feb 1994
Externally publishedYes

ASJC Scopus subject areas

  • General Environmental Science
  • Geophysics
  • General Engineering
  • Atmospheric Science
  • General Earth and Planetary Sciences

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