Mapping ionospheric convection response to IMF B(sub y) negative and B(sub z) positive conditions

Details Mapping ionospheric convection response to IMF B(sub y) negative and B(sub z) positive conditions Mapping ionospheric convection response to IMF B(sub y) negative and B(sub z) positive conditions

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jatp...56..223k&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 56, no. 2, p. 223-235

Physics

4

Convective Flow, Electric Fields, Interplanetary Magnetic Fields, Plasma Drift, Solar Wind, Thematic Mapping, Electrodynamics, Flow Distribution, Polar Regions, Solar Terrestrial Interactions

Scientific paper

We have used the Assimilative Mapping of Ionospheric Electrodynamics (AMIE) procedure to derive electric potential patterns for a period of strong and slowly varying northward Interplanetary Magnetic Field (IMF). Using these patterns we offer some insight into high-latitude convection response to differing IMF conditions between the hours of 0850 and 1720 UT on 14 January 1988. We introduce a newly assimilated data set, Defense Meteorological Satellite Program (DMSP) ion drift measurements, as a means of mapping electric fields in polar regions. Also, for the first time we map both southern and northern hemisphere convection flows. We show that significantly different convection patterns are simultaneously possible in the two polar caps when B(sub z) is positive and that asymmetries in these patterns are influenced by the strength of B(sub y) and B(sub x). When the ratio absolute value of B(sub y)/B(sub z) exceeds unity the polar cap convection increases and changes from sunward to anti-sunward for B(sub z) positive conditions.

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