Ionospheric flows associated with a transpolar arc

Details Ionospheric flows associated with a transpolar arc Ionospheric flows associated with a transpolar arc

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9521169n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Dec. 1, 1990, p. 21169-21178.

Physics

17

Atmospheric Circulation, Auroral Arcs, Ionospheric Currents, Ionospheric Drift, Dynamics Explorer Satellites, Interplanetary Magnetic Fields, Polar Regions

Scientific paper

Data on plasma flows associated with a transpolar arc are obtained by combining observations (on January 21, 1982) from the auroral imaging instruments aboard the DE 1 spacecraft with simultaneous observations of ionospheric electron drift velocities obtained with a ground-based coherent radar system and with an ion-drift meter on the DE 2 spacecraft at about 800-km altitude. The combined observations demonstrate that the electron-drift velocities within the transpolar arc at the intersection with the auroral oval on the nightside are directed equatorward into the oval and that the transpolar arc connects to the oval near the Harang discontinuity. It is also shown that the sunward flow along the transpolar arc is present near local noon.

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