Neutral motions in the polar thermosphere for northward Interplanetary Magnetic Field

Physics

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Atmospheric Circulation, Interplanetary Magnetic Fields, Neutral Atmospheres, Satellite-Borne Instruments, Thermosphere, Wind Measurement, Dynamics Explorer 2 Satellite, International Sun Earth Explorer 3, Ion Motion, Northern Hemisphere, Polar Caps, Polar Regions, Wind Velocity

Scientific paper

During the rare occurrence of November 24, 1982, when the north-south B(z) component of the IMF became positive for a period of about 11 hours and reached a steady value of about 25 nT, the DE-2 spacecraft simultaneously measured the ionic and neutral species of the high latitude F-region along the track of the polar-orbiting satellite. Data from two northern winter polar passes of DE-2 illustrate the response of the neutral F-region to ion drag forcing that arises from a configuration of ion convection characteristics of strongly northward IMF. The multicellular ion drift pattern associated with positive B(z) is observed to drive a similar, but less structured and weaker, neutral wind configuration in the winter polar cap. While major features of the ion drift pattern are mimicked by the neutral circulation, smaller scale ion flow structures are not. These results demonstrate that the sunward flow of neutral gas can be established and maintained by ion drag in the central polar cap, for positive B(z).

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