Physics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..101l&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 12, Feb. 1985, p. 101-104.
Physics
42
Convection Currents, Ionospheric Currents, Neutral Atmospheres, Polar Caps, Wind Effects, E Region, Hall Effect
Scientific paper
The neutral wind pattern over the summer polar cap can be driven by plasma convection to resemble the convection pattern. For a north-south component of the interplanetary magnetic field Bz directed southward, the wind speeds in the conducting E-region can become approximately 25 percent of the electric field drift speeds. If convection ceases, this neutral wind distribution can drive a significant polar cap current system for approximately 6 hours. The currents are reversed from those driven by the electric fields for southward Bz, and the Hall and field-aligned components of the current system resemble those observed during periods of northward Bz. The current magnitudes are similar to those observed during periods of small, northward Bz; however, observations indicate that electric fields often contribute to the currents as much as, or more than, the neutral winds.
Killeen Tim L.
Lyons Larry R.
Walterscheid Richard L.
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