On flow reversal boundaries and transpolar voltage in average models of high-latitude convection

Details On flow reversal boundaries and transpolar voltage in average models of high-latitude convection On flow reversal boundaries and transpolar voltage in average models of high-latitude convection

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..397l&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 39, March 1991, p. 397-409.

Other

15

Convective Flow, Interplanetary Magnetic Fields, Magnetosphere-Ionosphere Coupling, Polar Caps, Space Plasmas, Atmospheric Models, Steady Flow

Scientific paper

The implications of polar cap expansions, contractions and movements for empirical models of high-latitude plasma convection are examined. Some of these models have been generated by directly averaging flow measurements from large numbers of satellite passes or radar scans; others have employed more complex means to combine data taken at different times into large-scale patterns of flow. In all cases, the models have implicitly adopted the assumption that the polar cap is in steady state: they have all characterized the ionospheric flow in terms of the prevailing conditions (e.g., the interplanetary magnetic field and/or some index of terrestrial magnetic activity) without allowance for their history. On long enough time scales, the polar cap is indeed in steady state, but on time scales shorter than a few hours it is not and can oscillate in size and position. As a result, the method used to combine the data can influence the nature of the convection reversal boundary and the transpolar voltage in the derived model.

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