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Inner-shell transitions in Fe XIX-XXII in the X-ray spectra of solar flares and TokamaksCalculated spectra of the ions Fe XIX-XXII for various densities and temperatures are presented, thereby extending the work begun by Doschek, Feldman, and Cowan (1981). The calculations are based on a code (the Cowan code) that computes both the level structure of an ion and intensity factors for the 1s-2p satellite lines. A comparison is made between the calculated spectra and those observed in solar flares by the P78-1 and SMM instruments. The observed intensities of Fe XX lines, which are the most sensitive to density, are found to agree well with those calculated in the low-density limit. The agreement for lines arising from other ions is also very good. It is also seen that the predicted density variations in Fe XX are confirmed by the higher density Princeton Large Torus plasmas. Thus a possible useful density diagnostic is indicated for tokamak and high-density astrophysical plasmas, perhaps including some solar flares.
Document ID
19830041857
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Phillips, K. J. H.
(Science and Engineering Research Council, Rutherford Appleton Laboratory, Didcot Oxon, United Kingdom)
Lemen, J. R.
(London, University College, Mullard Space Science Laboratory, Dorking, Surrey, United Kingdom)
Cowan, R. D.
(Los Alamos National Laboratory Los Alamos, NM, United States)
Doschek, G. A.
(U.S. Navy, E. O. Hulburt Center for Space Research, Washington DC, United States)
Leibacher, J. W.
(Lockheed Research Laboratories Palo Alto, CA, United States)
Date Acquired
August 11, 2013
Publication Date
February 15, 1983
Publication Information
Publication: Astrophysical Journal
Subject Category
Solar Physics
Accession Number
83A23075
Funding Number(s)
CONTRACT_GRANT: NAS5-23758
Distribution Limits
Public
Copyright
Other

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