Determination of auroral heat fluxes and thermal ion outflows using a numerical ionospheric model and incoherent-scatter radar data

Details Determination of auroral heat fluxes and thermal ion outflows using a numerical ionospheric model and incoherent-scatter radar data Determination of auroral heat fluxes and thermal ion outflows using a numerical ionospheric model and incoherent-scatter radar data

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100..251m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. A1, p. 251-256

Physics

4

Auroras, Earth Ionosphere, Geomagnetism, Heat Flux, Ions, Polar Regions, Boundary Conditions, Daytime, Greenland, Incoherent Scatter Radar, Mathematical Models

Scientific paper

A comprehensive one-dimensional model of the polar ionosphere has been used in conjuction with incoherent-scater radar data from Sondrestrom, Greenland, to determine downward heat fluxes and thermal ion outflows at very high latitudes. For periods of very quiet geomagetic activity the model closely simulates the observed time-dependent behavior of the electron density, ion and electron conditions of the model, namely downward heat flux, and magnetic field-aligned ion flows, are continually adjusted with time to provide a best fit with data. The heat fluxes and ion flows are determined indirectly from this fitting procedure. The technique has been applied to a 10-hour daytime data set for February 12, 1990, to search for enhanced downward heat fluxes and outward thermal ion fluxes associated with dayside auroral oval. Variations of heat fluxes ranged from about 2 x 10(exp 9) to 2 x 10(exp 10) eV/cu cm/s, and vertical outward fluxes of ionization ranged from about zero to 8 x 10(exp 8)/cu cm/s, For both quantities the peak values occured when the radar site was located under the dayside auroral oval. It is suggested that these marked upward thermal ion flows in the dayside auroral ionosphere may be associated with energetic O(+) ion outflows that have been observed at high altitudes with spacecraft.

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