New Identifications of Mn VII and Fe VIII Lines Belonging to Transitions of the Type 3p64p-3p64d and 3p53d2-3p64d

Details New Identifications of Mn VII and Fe VIII Lines Belonging to Transitions of the Type 3p64p-3p64d and 3p53d2-3p64d New Identifications of Mn VII and Fe VIII Lines Belonging to Transitions of the Type 3p64p-3p64d and 3p53d2-3p64d

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...595..517e&link_type=abstract

The Astrophysical Journal, Volume 595, Issue 1, pp. 517-521.

Astronomy and Astrophysics

Astronomy

8

Atomic Data, Line: Identification, Sun: Corona, Sun: Uv Radiation

Scientific paper

The Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer aboard the Solar and Heliospheric Observatory (SOHO) recorded a large number of spectra in the 500-1600 Å region. Many of the detected spectral lines have been identified as transitions in ions from elements with low-to-moderate atomic numbers (Z<=20). However, a substantial number of lines remained unidentified. We postulated that some of the unidentified lines are transitions between excited configurations in Fe+7. Unfortunately, Cr+5 was the last ion in the K I isoelectronic sequence where the envisioned types of transitions were previously identified. In this paper we report new identifications, in laboratory-generated spectra, of transitions between excited configurations in Mn+6 and Fe+7, two additional ions along the K I isoelectronic sequence. Since the elemental abundance of manganese in the solar atmosphere is very low, no Mn VII lines were identified in the SUMER spectra; however, the laboratory-identified Fe VIII lines were found to be present in the SUMER quiet-Sun spectra recorded above the solar limb and in sunspot spectra recorded on the solar disk.

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