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3. Astrophysical measurements from rockets

Published online by Cambridge University Press:  25 April 2016

Herbert Friedman
Herbert Friedman*
Affiliation:
For unpublished material reported here, the author is indebted to his colleagues of the Optics Division, U.S. Naval Research Laboratory: T. A. Chubb, J. E. Kupperian, Jr., J. C. Lindsay, R. W. Kreplin, E. T. Byram, J. E. Milligan and A. Boggess III.

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The X-ray spectrum of a quiet Sun can be approximated by a 500,000° K Planckian distribution. In the absence of coronal excitation, as evidenced by the intensity of the Fe xiv green line, the X-ray spectrum has a short wave-length limit near 20 A. Coronal activity is accompanied by weak emissions down to wave-lengths as short as 6 A, which appear to be associated with coronal hot spots at temperatures of 2 x 106° K or higher.

Type
Research Article
Information
Transactions of the International Astronomical Union , Volume 10 , 1960 , pp. 706 - 708
Copyright
Copyright © Cambridge University Press 1960