Opacity Effects in Soft X-Ray Spectral Lines of the Solar Corona

Details Opacity Effects in Soft X-Ray Spectral Lines of the Solar Corona Opacity Effects in Soft X-Ray Spectral Lines of the Solar Corona

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.3606s&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #36.06; Bulletin of the American Astronomical Society, Vol. 28, p.874

Astronomy and Astrophysics

Astronomy

Scientific paper

Current literature suggests that several lines in the soft X-ray portion of the coronal spectrum may not be optically thin. Here, we wish to confirm the results of Schmelz, et al (1996, Submitted to Ap.J.) who find no significant opacity effects for three of the brightest non-iron resonance lines in this part of the spectrum -- O VIII at 18.97 Angstroms, Ne IX at 13.45 Angstroms, and Mg XI at 9.17 Angstroms . A comparison is made between each of these lines and an optically thin ``reference'' line produced by the same element in the same ionization state -- O VIII at 15.18 Angstroms, Ne IX at 13.55 Angstroms, and Mg XI at 9.23 Angstroms. In the latter two cases, the comparison line is the intersystem line of the He-like triplet. 33 spectra from the Solar Maximum Mission Flat Crystal Spectrometer are analyzed, all of which were obtained from non-flaring, quasi-stable active regions.

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