High latitude plasma convection - Predictions for EISCAT and Sondre Stromfjord

Details High latitude plasma convection - Predictions for EISCAT and Sondre Stromfjord High latitude plasma convection - Predictions for EISCAT and Sondre Stromfjord

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..877s&link_type=abstract

Geophysical Research Letters, vol. 6, Nov. 1979, p. 877-880.

Physics

Convective Flow, Diurnal Variations, Magnetohydrodynamic Flow, Polar Regions, Drift Rate, Electric Fields, Mathematical Models, Plasma Dynamics, Prediction Analysis Techniques

Scientific paper

A plasma convection model was used to predict diurnal patterns of horizontal drift velocities in the vicinity of the EISCAT incoherent scatter facility at Tromso, Norway and for Sondre Stromfjord, Greenland, a proposed new incoherent scatter facility site. The convection model includes the offset of 11.4 deg between the geographic and geomagnetic poles (Northern Hemisphere), the tendency of plasma to corotate about the geographic pole, and a magnetospheric electric field mapped to a circle about a center offset by 5 deg in the antisunward direction from the magnetic pole. Four different magnetospheric electric field configurations were considered, including a constant cross-tail electric field, asymmetric electric fields with enhancements on the dawn and dusk sides of the polar cap, and an electric field pattern that is not aligned parallel to the noon-midnight magnetic meridian. The different electric field configurations produce different signatures in the plasma convection pattern which are clearly identified. Both of these high-latitude sites are better suited to study magnetospheric convection effects than either Chatanika, Alaska or Millstone Hill, Massachusetts. Also, each site appears to have unique capabilities with regard to studying certain aspects of the magnetospheric electric field.

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