Seasonal changes in thermospheric molecular oxygen - A solar activity control

Details Seasonal changes in thermospheric molecular oxygen - A solar activity control Seasonal changes in thermospheric molecular oxygen - A solar activity control

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..551f&link_type=abstract

Geophysical Research Letters, vol. 9, May 1982, p. 551-554.

Physics

3

Annual Variations, Incoherent Scatter Radar, Molecular Gases, Oxygen, Solar Activity Effects, Thermosphere, Atmospheric Circulation, Explorer 55 Satellite, F 2 Region, Gas Pressure, Solar Flux

Scientific paper

It is shown that the discrepancy between incoherent scatter estimates of the seasonal O2 variation for 1969-1970, and the AE-C and -D satellites' in situ mass spectrometer measurements of 1974-1975, may be linked to the change in solar flux conditions. This presents an experimental indication of solar flux control of seasonal O2 behavior. It is hypothesized that the thermospheric winds induced by pressure gradients efficiently act to enhance O2 during summers and reduce it in winter. A mechanism for the triggering and/or enhancement of this effect must be sought out in photochemical departures of diffusive equilibrium for O2, as well as its solar flux dependence.

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