Seasonal dependence of high-latitude electric fields

Details Seasonal dependence of high-latitude electric fields Seasonal dependence of high-latitude electric fields

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.5723d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, April 1, 1991, p. 5723-5735. CNRS-supported research.

Physics

45

Earth Ionosphere, Electric Fields, Geomagnetism, Interplanetary Magnetic Fields, Magnetic Field Configurations, Polar Regions, Annual Variations, Earth Magnetosphere, Electrostatics, Least Squares Method

Scientific paper

A systematic investigation of the seasonal dependence of the high-latitude electric field is discussed. Sondrestrom incoherent-scatter-radar data spanning the invariant latitude range from 68.5 deg to 82.5 deg is binned and averaged according to season. It is found that the large-scale convection pattern changes with season significantly; this change involves the overall shape of the convection pattern as well as the electric-field intensity and thus the total dawn-dusk potential across the polar cap. The cross polar-cap potential drop is the largest in fall, followed by winter, spring, and summer. In the dawn cell, the latitude of the convection reversal is the lowest during summer; in the dusk cell, the latitude of the reversal is the lowest during winter.

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