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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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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.
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences © 1976 Royal Society