High Coronal Electron Densities in a Solar Flare from Fe XXI and Fe XXII X-Ray Line Measurements

Details High Coronal Electron Densities in a Solar Flare from Fe XXI and Fe XXII X-Ray Line Measurements High Coronal Electron Densities in a Solar Flare from Fe XXI and Fe XXII X-Ray Line Measurements

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...466..549p&link_type=abstract

Astrophysical Journal v.466, p.549

Astronomy and Astrophysics

Astronomy

43

Atomic Processes, Sun: Flares, Sun: X-Rays, Gamma Rays, Sun: Corona

Scientific paper

New calculations of the intensities of the Fe XXI 2p2-2p4l X-ray lines using the distorted wave method are described and compared with observations made by a crystal spectrometer on the Solar Maximum Mission about 6 minutes after the peak of a very intense flare. The comparison enables the electron density of the flare to be derived, the value being about 2 or 3 × 1012 cm-3. Some nearby Fe XXII X-ray lines, scanned 1 minute after flare peak, give an even higher value, 1013 cm-3. This is the first time corroborated values of such high densities have been obtained from ions emitted at temperatures as high as ˜10 MK. They imply very rapid radiation cooling rates and have other important consequences for flare models.

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