Correlations Between Exospheric Temperature and Various Indicators of Solar Activity
Jeffrey M. Forbes
Jan 1973 · Air Force Cambridge Research Laboratories, Air Force Systems Command, United States Air Force
eBook
14
Pages
About this eBook
A single-parameter correlation analysis is performed between nighttime minimum exospheric temperatures obtained during 1966-1970, as determined from satellite drag data and a Jacchia model, and various indicators of solar activity. These include Sagamore Hill radio fluxes between 606 and 8800 MHz, Ottawa 2800 MHz radio fluxes, HeII(304A) fluxes, and CaII indices. Results show that no one of these indicators stands out as best describing exospheric temperature variations under all conditions, although radio fluxes near 1415 MHz appear to give slightly better results during periods of low solar activity. The relative performance of the solar indices is not consistent on a year-to-year basis. It is concluded that a better representation might be obtained with a multi-parameter fit to the temperature data, including different weighting factors for the solar indices at different parts of the solar cycle. (Author).
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