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Interferometric Observations of the Extreme Solar Limb at 2.8 and 6 cm During the October 1977 Eclipse

Published online by Cambridge University Press:  14 August 2015

G. J. Hurford ,
K. A. Marsh  and
H. Zirin
G. J. Hurford
Affiliation:
California Institute of Technology
K. A. Marsh
Affiliation:
California Institute of Technology
H. Zirin
Affiliation:
California Institute of Technology

Abstract

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The radial intensity profile at the extreme solar limb was measured with high angular resolution during the October, 1977 partial solar eclipse using the Owens Valley solar interferometer at 2.8 cm and the VLA at 6 cm. Substantial limb brightening was observed at 6 cm, with a peak brightness temperature corresponding to an 80% increase over the disk value. Much less limb brightening was observed at 2.8 cm. In each case an extended “tail” to the brightness distribution was detected. The results at both wavelengths are consistent with a simple model in which a rough chromosphere is overlaid by a corona in hydrostatic equilibrium with a density of 5 × 108 cm−3 at its base.

Type
Session I - Quiet Sun
Information
Symposium - International Astronomical Union , Volume 86: Radio Physics of the Sun , 1980 , pp. 61 - 64
Copyright
Copyright © Reidel 1980 

References

Furst, E., Hachenberg, O., and Hirth, W.: 1974, Astron. Astrophys. 36, pp. 123–133.Google Scholar
Marsh, K.A., Zirin, H., and Hurford, G.J.: 1979, Astrophys. J. 228, pp. 610–615.Google Scholar
Simon, M. and Zirin, H.: 1969, Solar Phys. 9, pp. 317–327.CrossRefGoogle Scholar
Zirin, H., Hurford, G.J., and Marsh, K.A.: 1978, Astrophys. J. 224, pp. 1043–1047.Google Scholar