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Relative coronal abundances derived from X-ray observations 3: The effect of cascades on the relative intensity of Fe (XVII) line fluxes, and a revised iron abundancePermitted lines in the optically thin coronal X-ray spectrum were analyzed to find the distribution of coronal material, as a function of temperature, without special assumptions concerning coronal conditions. The resonance lines of N, O, Ne, Na, Mg, Al, Si, S, and Ar which dominate the quiet coronal spectrum below 25A were observed. Coronal models were constructed and the relative abundances of these elements were determined. The intensity in the lines of the 2p-3d transitions near 15A was used in conjunction with these coronal models, with the assumption of coronal excitation, to determine the Fe XVII abundance. The relative intensities of the 2p-3d Fe XVII lines observed in the corona agreed with theoretical prediction. Using a more complete theoretical model, and higher resolution observations, a revised calculation of iron abundance relative to hydrogen of 0.000026 was made.
Document ID
19740027101
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Walker, A. B. C., Jr. (Stanford Univ. CA, United States)
Rugge, H. R. (Aerospace Corp. Los Angeles, United States)
Weiss, K. (Aerospace Corp. Los Angeles, United States)
Date Acquired
September 3, 2013
Publication Date
August 1, 1974
Subject Category
Space Radiation
Report/Patent Number
NASA-CR-140513
SU-IPR-589
Accession Number
74N35214
Funding Number(s)
CONTRACT_GRANT: NGR-05-020-695
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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