The results of a survey of celestial sources of X rays with energies in the range 20–60 kev are used to place new upper limits to the hard X-ray flux from the quiet sun. The data, obtained in 1965 with a balloon-borne scintillation detector, allow the upper limits to the hard X-ray flux suggested by OSO 1 measurements to be lowered by nearly two orders of magnitude. Upper limits to the Jovian X-ray flux are also discussed.
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Edwards et al. (1967) studied this question.
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