Accession Number : AD0704816

Title :   VARIATIONS IN THE SOLAR ULTRAVIOLET FLUX: JULY 13-AUGUST 9, 1968.

Descriptive Note : Rept. for Jul 67-Dec 69,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Prag,Arthur B. ; Morse,Fred A.

Report Date : 15 FEB 1970

Pagination or Media Count : 25

Abstract : Three simple photodiodes on board the SPADES satellite (1968-059A) have measured the near-earth solar flux in three broad wavelength intervals: 300-1150 A, 1150-1600 A, and 1600-2100 A. During the first 27 days of the satellite's lifetime, the signals in the two longer wavelength intervals showed nonrandom variations of more than a factor of three, and the short wavelength flux varied by 60%. Except for the 1150-1600 A channel, the variation did not correlate well with F10.7; all three channels showed a much stronger correlation with the product of area and intensity of the calcium plage regions. The data are consistent with a model in which the effective plage temperature is about 1250 K degrees higher than the background sun at all wavelengths in the 300-2100 A interval. (Author)

Descriptors :   (*SOLAR RADIATION, ULTRAVIOLET RADIATION), INTENSITY, SOLAR SPECTRUM, PHOTODIODES, CALIBRATION, SCIENTIFIC SATELLITES

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE