Abstract
OBSERVATIONS have been made at the Kootwijk Station of the Dutch Organization for Radio Astronomy, in order to ascertain whether hydrogen radiation of 21 cm. wave-length, detected in the galaxy, would be found also in the sun. The 7.50metre mirror and the receiver technique were the same as used for the investigations of the Galaxy*. No indication of a spectral line was found. The apparatus was sufficiently sensitive to detect a variation of 1/260 in the continuous radio spectrum.
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DE JAGER, C., MINNAERT, M. & MULLER, C. Absence of Hydrogen Radiation of Wavelength 21 cm. in the Sun. Nature 168, 391 (1951). https://doi.org/10.1038/168391b0
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DOI: https://doi.org/10.1038/168391b0
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