Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...375..789s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 375, July 10, 1991, p. 789-799. Research supported by Lockheed Corp.
Astronomy and Astrophysics
Astrophysics
81
Solar Activity, Solar Corona, Solar X-Rays, Spectral Line Width, Line Spectra, Solar Maximum Mission, X Ray Spectra
Scientific paper
Post-SMM repair Flat Crystal Spectrometer (FCS) observations of coronal X-ray line broadening in a nonflaring active region are discussed. The resulting map of FCS line profiles across the central X-ray bright portion of a large active region shows a clear variation in line width for the Mg XI resonance line at 9.17 A, but no evidnece of line shifts. Line ratios yield T(e) of about 3 x 10 to the 6th K within 10 percent for most of the map. The brightest, broadest profiles are consistent with emission from the tops of loops overlying the magnetic neutral line. For the spatially averaged Mg XI resonance line profile, the 'excess velocity' v(ex) corresponding to the excess width above the thermal value equals the thermal velocity for Mg ions, 45 km/s; for some individual bright pixels v(ex) is 60 km/s or more. The observed coronal line broadening is interpreted as a signature of the mechanisms responsible for coronal heating in active regions.
Saba Julia L. R.
Strong Keith Temple
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