Abstract
ENHANCED solar radiation at metre wave-lengths is generally supposed to originate within a restricted area of the corona above a sunspot. The position of the radio source indicates that the existence of a sunspot is a necessary condition for the emission of excess radiation.
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Korn, J., Astro. Nachr., 270, 105 (1940).
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MALTBY, P. Correlation between the Intensity of the Umbra of Sunspots and Enhanced Radiation on 200 Mc/s.. Nature 184, 1391 (1959). https://doi.org/10.1038/1841391a0
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DOI: https://doi.org/10.1038/1841391a0
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