A model for multiple throat structures in the polar cap flow entry region

Details A model for multiple throat structures in the polar cap flow entry region A model for multiple throat structures in the polar cap flow entry region

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.9785m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Sept. 1, 1988, p. 9785-9790.

Computer Science

Sound

24

Convective Flow, Interplanetary Magnetic Fields, Ionospheric Currents, Magnetohydrodynamic Flow, Polar Caps, Atmospheric Models, Drift Rate, Electric Fields, Ion Motion, Satellite Sounding, Two Dimensional Models

Scientific paper

A two-dimensional ionospheric convection model has been developed to produce convection patterns for southward interplanetary magnetic field (IMF) and a positive or negative IMF y component. The model consists of a movable, shear convection reversal boundary with a gap in it where flux enters the polar cap. The sign of IMF B(y) determines the dayside gap geometry. This simple model is used to simulate measured ionospheric flows from the DE 2 satellite. Roughly 35 percent of DE 2 passes that cross the dayside between 0800 and 1400 hours MLT cannot be modeled with a single narrow flow entry region. By comparing model calculations and the measured ion flows, it is shown that the dayside flow entry region to the polar cap typically spans several hours in local time. The electric field can concentrate along portions of the polar cap entrance and weaken between the concentrated regions, thus forming multiple 'throats'.

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