Polar cap plasma flow entry region

Details Polar cap plasma flow entry region Polar cap plasma flow entry region

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.3640p&link_type=abstract

Journal of Geophysical Research, vol. 86, May 1, 1981, p. 3640.

Physics

1

Atmospheric Entry, Magnetohydrodynamic Flow, Polar Caps, Space Plasmas, Auroras, Diurnal Variations, Interplanetary Magnetic Fields

Scientific paper

The influence of the sign of the y component of the interplanetary magnetic field on the polar cap plasma flow entry region or throat is analyzed. The daily distributions of the occurrence of the slant E condition at Godhavn (77.5 deg invariant latitude) on days with IMF y component greater than zero (away days) and less than zero (toward days) are compared for conditions of Kp index greater than 3, when the dayside auroral oval is south of Godhavn, and Kp index less than or equal to 3, when the auroral oval is further north. The time of maximum slant E condition occurrence, which is taken as the signature of the throat region, is found to be displaced about 1 hour towards afternoon on the toward days relative to the away days for Kp greater than 3, but to coincide for Kp less than or equal to 3. The lack of difference in the slant E condition distributions for regions outside the auroral oval thus suggests that the plasma flow in and equatorward of the throat region is independent of the polarity of the y component of the interplanetary magnetic field.

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