Observations of neutral winds in the polar cap during northward IMF

Details Observations of neutral winds in the polar cap during northward IMF Observations of neutral winds in the polar cap during northward IMF

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jatp...56..285n&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 56, no. 2, p. 285-295

Physics

14

F Region, Interplanetary Magnetic Fields, Magnetohydrodynamic Flow, Neutral Currents, Polar Caps, Solar Wind, Wind Profiles, Electric Fields, Geomagnetism, Horizontal Distribution, Particle Precipitation, Remote Sensing, Solar Terrestrial Interactions

Scientific paper

Long term remote observations of neutral winds at F-region altitudes have been performed at Thule Air Base (lat. 76.5 deg N, long. 69.0 deg W), Greenland, and Sondre Stromfjord (lat. 67.0 deg N, long. 50.9 deg 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 less than or equal to 4 were sorted according to the sign of the interplanetary magnetic field (IMF) B(sub z) component. The averaged maximum poleward flow near midnight local standard time (LST) was reduced by approximately one third during B(sub z) northward conditions. If the magnitude of B(sub y) was less than the magnitude of the northward B(sub z) component, then the averaged poleward flow was further reduced by one half. In addition, if B(sub z) greater than 5 nT, then sunward directed horizontal neutral winds were observed at the very highest latitudes near noon LST.

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