Abstract The diversity in the published values of coronal abundances is unsettling, especially as the range of results seems to be beyond the quoted uncertainties. We present measurements of the relative abundance of iron and neon derived from soft X-ray spectra of active regions. From a data base of over 200 spectra taken by the Solar Maximum Mission Flat Crystal Spectrometer, we find that the relative abundance can vary by as much as a factor of about 7 and can change on timescales of <1 h.
Abundance variations in solar active regions
Advances in Space Research ; 11 , 1 ; 151-154
1991-01-01
4 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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