Accession Number : AD0766421

Title :   Correlations between Exospheric Temperature and Various Indicators of Solar Activity.

Descriptive Note : Environmental research Papers,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Forbes,Jeffrey M. ; Straka,Ronald M.

Report Date : 21 JUN 1973

Pagination or Media Count : 21

Abstract : 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)

Descriptors :   (*EXOSPHERE, *ATMOSPHERIC TEMPERATURE), CORRELATION TECHNIQUES, SOLAR DISTURBANCES, SOLAR RADIATION, STATISTICAL ANALYSIS

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE