Investigation of the 27-day periodicity in the thermospheric density fluctuations

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Atmospheric Density, Satellite Drag, Satellite Observation, Solar Activity Effects, Thermosphere, Twenty-Seven Day Variation, Atmospheric Models, Far Ultraviolet Radiation, Magnetic Storms, Solar Flux Density

Scientific paper

Data on satellite drag in the upper atmosphere (1965-1972) were used to study the 27-day periodicity of thermospheric density fluctuations and to discover the association between certain events and a density maximum. It was found that every maximum in solar flux density was followed by a thermospheric density maximum in 0-5 days, and that every minimum in galactic cosmic ray intensity was followed by a thermospheric density maximum in 5-10 days. Eleven other thermospheric density maxima occurred, all during solar flux density 'defects' - that is, during 27-day solar flux cycles that do not show a maximum. It is concluded that, in addition to EUV, a heating mechanism involving the geomagnetic field is responsible for the regularity of the thermospheric density periodicity.

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