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X-ray line ratios from helium-like ions - Updated theory and SMM flare observationsThe potential which the conduction of measurements of the three principal lines emitted from helium-like ions has for the determination of plasma electron density was initially pointed out by Gabriel and Jordan (1969). The diagnostic technique is based on the fact that the ratio, R, of the intensity of a forbidden line to the intensity of an intercombination line decreases as electron density increases due to collisional excitation of levels. In the present investigation a further refinement of this procedure is provided by specifically calculating the effects of cascades from levels with principal quantum numbers up to n=6. Two improved spectrometers recently placed in operation include the SOLEX instrument on the satellite P78-1 and the X-ray Polychromator (XRP) instrument on the NASA Solar Maximum Mission satellite. Measurements obtained with one of the spectrometers making up the XRP are presented, taking into account the emission from Ne IX ions.
Document ID
19830053426
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Wolfson, C. J.
(Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Leibacher, J. W.
(Lockheed Research Laboratories Palo Alto, CA, United States)
Doyle, J. G.
(Belfast, Queen's University Belfast, United Kingdom)
Phillips, K. J. H.
(Science and Engineering Research Council, Rutherford Appleton Laboratory, Didcot Oxon, United Kingdom)
Date Acquired
August 11, 2013
Publication Date
June 1, 1983
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 269
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
83A34644
Funding Number(s)
CONTRACT_GRANT: NAS5-23758
Distribution Limits
Public
Copyright
Other

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