Abstract
RUSSELL1,2 has obtained X-ray photographs of the Sun at an epoch close to the recent minimum in solar activity which occurred late in 1964 and which preceded the present rising phase of the new solar cycle. The photographs were taken from a high-altitude rocket, and the quality and resolution are sufficiently good to allow limb brightening to be clearly distinguished from several small active regions that were present on the disk. The photographs seem to suggest that, in contrast to the brightening at the limbs, there was also some darkening at the north and south poles.
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MINNIS, C. Ionosphere, and X-ray Images of the Sun. Nature 208, 476 (1965). https://doi.org/10.1038/208476a0
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DOI: https://doi.org/10.1038/208476a0
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