Observation and theoretical modeling of a region of downward field-aligned flow of O(+) in the winter dayside polar cap

Details Observation and theoretical modeling of a region of downward field-aligned flow of O(+) in the winter dayside polar cap Observation and theoretical modeling of a region of downward field-aligned flow of O(+) in the winter dayside polar cap

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jatp...47..489s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 47, May 1985, p. 489-495. Sponsorship: Science and Enginee

Physics

14

F Region, Field Aligned Currents, Oxygen Ions, Polar Caps, Radar Measurement, Velocity Measurement, Daytime, Doppler Radar, Eiscat Radar System (Europe), Ionospheric Electron Density, Winter

Scientific paper

Optical and radar measurements of ion drift at high latitudes near the terminator, which show that there is a region of large downward field-aligned ion flow below the F-peak in the dayside of the polar cap, are presented and examined. The region starts around noon LMT, extending towards 1800 LMT, following the 72-deg invariant latitude circle. When the field perpendicular component in the plane of the observation is about 100 m/s poleward, the maximum field-aligned velocities are found to be in the region of 400 m/s. The Sheffield ionospheric (Quegan et al., 1982) model is consistent with the variation of field-aligned ion flow in latitude, time, and sign, but does not match the high velocities.

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