Letter | Published:

Absence of Hydrogen Radiation of Wavelength 21 cm. in the Sun

Naturevolume 168page391 (1951) | Download Citation



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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    See p. 356 of this issue of Nature.

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  1. Dutch Organization for Radio Astronomy, Kootwijk Radio, Holland

    • C. DE JAGER
    • , M. MINNAERT
    •  & C. A. MULLER


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