Statistics – Computation
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.3691f&link_type=abstract
Journal of Geophysical Research, vol. 83, Aug. 1, 1978, p. 3691-3698.
Statistics
Computation
2
Argon, Atmospheric Composition, Atmospheric Tides, Diurnal Variations, Helium, Hydrogen Atoms, Nitrogen, Oxygen, Oxygen Atoms, Thermosphere, Atmospheric Models, Solar Activity Effects, Temperature Distribution, Thermal Diffusion
Scientific paper
Theoretical computations are presented for diurnal and semidiurnal tidal variations in thermospheric O, O2, N2, Ar, He, and H at minimum and maximum levels of solar activity. The model formally accounts for tidal temperatures, horizontal and vertical tidal winds, photochemistry and ion chemistry, exospheric transport, and thermal diffusion in determining the tidal variations of these constituents. Specification of the background (zonally averaged) distribution contains a flux term due to either photochemistry planetary escape or background vertical winds, thus allowing for deviations from diffusive equilibrium in the time average component. It is shown that the relative amplitude of semidiurnal to diurnal components varies considerably with latitude, solar cycle, and constituent. The results support the necessity of obtaining satellite mass spectrometer and accelerometer measurements covering a wider range of latitudes and solar activity conditions.
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