Solar X-Ray and Diffuse Cosmic X-Ray Spectra Measured with a Satellite-Borne Instrument
Abstract
On 1967 August 7-8, the spectrum and intensity of the solar X-ray flux and the diffuse cosmic X-ray flux were measured. An instrument using an NaI(Tl) scintillation spectrometer as the detector was carried aboard an Air Force polar-orbiting satellite. The instrument recorded the flux of X-rays with energies between 2.6 and 19 keV. The Sun was relatively quiet, and solar X-rays were detected only between 2.6 and 9.8 keV. If a bremsstrahlung spectrum is assumed, the intensity in this interval varied between 1.3 and 3.1 X 10- erg sec. 1. The temperature varied between 8.5 and 12.5 X 10 K, and the emission measure N4VjV varied between 3.5 and 1.7 x 10 . Comparisons are made with similar data published by Hudson et aL We shall show that our data and Hudson's are consistent with a decrease of emission measure with increasing temperature during a flare. It was found that the diffuse cosmic-X-ray spectrum was closely approximated by N(h ) = 21 (hv) ' 56. The total intensity observed between 2.6 and 19 keV was 9.8 X 10- erg .
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