Latitude variations of exospheric hydrogen and the polar wind

Details Latitude variations of exospheric hydrogen and the polar wind Latitude variations of exospheric hydrogen and the polar wind

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978p%26ss...26..873t&link_type=abstract

(International Association of Geomagnetism and Aeronomy, Scientific Assembly, 3rd, Seattle, Wash., Aug. 22-Sept. 3, 1977.) Plane

Computer Science

Atmospheric Composition, Density Distribution, Exosphere, Geomagnetic Latitude, Hydrogen Atoms, Polar Regions, Airglow, Atmospheric Circulation, Charge Exchange, Lyman Alpha Radiation, Ogo-6, Thermosphere

Scientific paper

The paper examines the effects of the most plausible mechanisms which could redistribute the exospheric hydrogen in latitude according to OGO-6 Lyman-alpha photometer data. The observed value of the polar wind H(plus) fluxes is considerably less than required by the data. Thermospheric winds tend to move the hydrogen in the opposite direction to the one observed (at least during solstice), and must be of minor influence. High-latitude sources may heat H(plus) ions that then charge-exchange with colder atmospheric hydrogen to produce hot H-atoms, but the required H(plus) densities are known to be quite low at high latitudes. It is concluded that there is some very important but unrecognized ionospheric-atmospheric coupling at high altitudes, or there is some systematic error present in both types of L-alpha experiments.

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