Solar and cosmic X-rays above 7.7 keV |
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| Authors: | Hugh S Hudson Laurence E Peterson Daniel A Schwartz |
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| Institution: | (1) University of California, San Diego, La Jolla, Calif., U.S.A. |
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| Abstract: | Since its launch on March 8, 1967, the OSO-III has continuously observed solar and cosmic X-rays over the 7.7–210 keV range. The sun emits many impulsive X-ray bursts having fluxes several orders of magnitude above the background level of 8 × 10–9 ergs(cm2-sec)–1 at 7.7 keV and characteristic times on the order of 5 min. Ninety-five such events having fluxes >3 × 10–5 ergs(cm2-sec)–1 were detected in the period from March 8 to June 15, 1967. The cosmic X-ray source Lupus XR-1 has been observed to have a power law spectral form and no significant time variations over a 40-day period. Upper limits have been obtained on the hard X-ray flux of the peculiar galaxy M 87. |
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