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Electron density diagnostics in the 10-100 A interval for a solar flareElectron density measurements from spectral-line diagnostics are reported for a solar flare on July 13, 1982, 1627 UT. The spectrogram, covering the 10-95 A interval, contained usable lines of helium-like ions C V, N VI, O VII, and Ne IX which are formed over the temperature interval 0.7-3.5 x 10 to the 6th K. In addition, spectral-line ratios of Si IX, Fe XIV, and Ca XV were compared with new theoretical estimates of their electron density sensitivity to obtain additional electron density diagnostics. An electron density of 3 x 10 to the 10th/cu cm was obtained. The comparison of these results from helium-like and other ions gives confidence in the utility of these tools for solar coronal analysis and will lead to a fuller understanding of the phenomena observed in this flare.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Brown, W. A. (Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Bruner, M. E. (Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Acton, L. W. (Lockheed Research Laboratories Palo Alto, CA, United States)
Mason, H. E. (Cambridge University United Kingdom)
Date Acquired
August 12, 2013
Publication Date
February 15, 1986
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 301
ISSN: 0004-637X
Subject Category
Funding Number(s)
Distribution Limits