Quantitative calculations of helium ion escape fluxes from the polar ionospheres

Details Quantitative calculations of helium ion escape fluxes from the polar ionospheres Quantitative calculations of helium ion escape fluxes from the polar ionospheres

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.5617r&link_type=abstract

Journal of Geophysical Research, vol. 83, Dec. 1, 1978, p. 5617-5623.

Physics

6

Atmospheric Models, Helium Ions, Ionospheric Ion Density, Polar Regions, Satellite Observation, Annual Variations, F Region, Ionization Cross Sections, Photoionization, Scientific Satellites, Winter

Scientific paper

An attempt is made to reduce the discrepancy between the earlier theoretical model and the recent experimental observations of H(+) outward fluxes for winter and summer hemispheres by improving the theoretical model. The helium photoionization cross sections used are accurate to 10%, the latest solar EUV fluxes measured by the Atmosphere Explorer satellites are incorporated, and the most recent MSIS model of the neutral atmosphere is contained in the model. A range of conditions covering solar cycle, seasonal, and geomagnetic conditions are studied. The results show a maximum H(+) escape flux of 1.4 times 10 to the 7th per sq cm per sec for solar maximum, winter, low magnetic activity conditions, which is within the scatter of the measured fluxes. The computed summer H(+) escape flux is a factor of 20 lower than the winter value. Possible reasons for the slight discrepancy between theory and experiment in summer are discussed.

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