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Spectroscopic Studies of the Solar Corona at X-Ray Wavelengths [and Discussion]

L. W. Acton, R. C. Catura and G. Vaiana
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
Vol. 281, No. 1304, A Discussion on the Physics of the Solar Atmosphere (May 6, 1976), pp. 383-390
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/74608
Page Count: 8
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Spectroscopic Studies of the Solar Corona at X-Ray Wavelengths [and Discussion]
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Abstract

The spatial distribution of the emission in several X-ray lines is discussed with emphasis on temperature dependence and association with active regions. New results are presented for the trio of helium-like O VII lines which demonstrate (1) a spatial variation in the density dependent forbidden to intersystem line ratio, and (2) a strong spatial variation in the intensity of the O VII resonance line relative to the optically forbidden transitions. The second effect appears to be caused by resonance scattering by material in the line of sight.

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