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Abundance variations in solar active regionsThe diversity in the published values of coronal abundances is unsettling, especially as the range of results seems to be beyond the quoted uncertainties. Measurements of the relative abundance of iron and neon derived from soft X-ray spectra of active regions are presented. From a data base of over 200 spectra taken by the Solar Maximum Mission Flat Crystal Spectrometer, it is found that the relative abundance can vary by as much as a factor of about 7 and can change on timescales of less than 1 h.
Document ID
19910044900
Document Type
Reprint (Version printed in journal)
Authors
Strong, K. T. (Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Lemen, J. R. (Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Linford, G. A. (Lockheed Solar and Astrophysics Laboratory Palo Alto, CA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Advances in Space Research
Volume: 11
Issue: 1 19
ISSN: 0273-1177
Subject Category
SOLAR PHYSICS
Funding Number(s)
CONTRACT_GRANT: NAS5-28713
CONTRACT_GRANT: NAS5-30431
Distribution Limits
Public
Copyright
Other