Observations of neutral winds in the polar cap during northward IMF

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

doi:10.1016/0021-9169(94)90036-1

Observations of neutral winds in the polar cap during northward IMF

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

Research output: Contribution to journal › Article › peer-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 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.

Original language	English (US)
Pages (from-to)	285-295
Number of pages	11
Journal	Journal of Atmospheric and Terrestrial Physics
Volume	56
Issue number	2
DOIs	https://doi.org/10.1016/0021-9169(94)90036-1
State	Published - Feb 1994
Externally published	Yes

ASJC Scopus subject areas

Environmental Science(all)
Geophysics
Engineering(all)
Atmospheric Science
Earth and Planetary Sciences(all)

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10.1016/0021-9169(94)90036-1

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title = "Observations of neutral winds in the polar cap during northward IMF",

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 S{\o}ndre Str{\o}mfjord (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.",

author = "Niciejewski, {R. J.} and Killeen, {T. L.} and Y. Won",

year = "1994",

month = feb,

doi = "10.1016/0021-9169(94)90036-1",

language = "English (US)",

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journal = "Journal of Atmospheric and Solar-Terrestrial Physics",

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T1 - Observations of neutral winds in the polar cap during northward IMF

AU - Niciejewski, R. J.

AU - Killeen, T. L.

AU - Won, Y.

PY - 1994/2

Y1 - 1994/2

N2 - 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.

AB - 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.

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Observations of neutral winds in the polar cap during northward IMF

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