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48. The radial brightness distribution of the sun at 9·4 cm.

Published online by Cambridge University Press:  14 August 2015

F. T. Haddock
F. T. Haddock*
Affiliation:
Naval Research Laboratory, Washington, D.C., U.S.A.*

Extract

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The Naval Research Laboratory has supported four eclipse expeditions (in the years 1947, 1950, 1952 and 1954) under the direction of Dr J. P. Hagen. The principal purpose was to find the variation of the solar microwave radiation during a total optical eclipse of the sun. During the last two eclipses the sun was sufficiently inactive to enable us to derive the centre-to-limb brightness distribution at a wave-length of 9·4 cm., on the assumption that the distribution was circularly symmetrical. Since these two eclipses were of the same optical magnitude (within 0·12 %) and were measured with the same equipment located at each eclipse near the centre-line of mid-totality, it is of interest to compare their results. The 1954 eclipse observation was described in the last paper by Mayer, Sloanaker and Hagen. The 1952 observation has already been described [1].

Type
Part IV: The Quiet Sun
Information
Symposium - International Astronomical Union , Volume 4: Radio Astronomy , 1957 , pp. 273 - 278
Copyright
Copyright © Cambridge University Press 1957 

References

1. Haddock, F. T. J. Geophys. Res. 59, 174, 1954.Google Scholar
2. Christiansen, W. N. and Warburton, J. A. Observatory , 75, 9, 1955.Google Scholar
3. Hagen, J. P. Ap. J. 113, 547, 1951.Google Scholar
4. Covington, A. E. and Broten, N. W. Ap. J. 119, 585, 1954.Google Scholar
5. van de Hulst, H. C. Nature , 163, 24, 1949.Google Scholar