Computer Science – Sound
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..461d&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 12, July 1985, p. 461-464.
Computer Science
Sound
10
Convection Currents, Interplanetary Magnetic Fields, Ionospheric Sounding, Night Sky, Polar Regions, Auroral Zones, Magnetohydrodynamic Flow, Plasma Drift, Polar Caps
Scientific paper
Sondrestrom radar observations reveal that the dawn-dusk (By) component of the interplanetary magnetic field (IMF) strongly influences the nightside polar convection. This effect is quite complex. The convection for one orientation of By is not the mirror image of the other orientation. A positive By (i.e., pointing toward dusk) seems to organize the velocities such that, at all local times, they are predominantly westward within the radar field-of-view (approximately 68 deg-to-82 deg invariant latitude). Between dusk and midnight, on one such occasion, sunward flow is observed within the polar cap. In the midnight and dawn sectors, when By is negative, the plasma velocities often appear shifted toward early hours such that large southward velocities are observed about 3 hours before midnight. These are the only times when the predominant velocity component is southward.
de La Beaujardiere Odile
Kelly John D.
King Joseph H.
Wickwar Vincent B.
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