Satellite lines in the solar X-ray spectrum

✍ Scribed by Werner M. Neupert

• Publisher: Springer
• Year: 1971
• Tongue: English
• Weight: 749 KB
• Volume: 18
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00149069

✦ Synopsis

Observations of solar X-ray line emission using crystal spectrometers during a large chromospheric flare have provided a list of wavelengths with a precision of 0.003 A_ in first order of diffraction and correspondingly better in higher orders. In addition to the resonance, intersystem (1 1S0-2 zP1) and forbidden (1 1S0-2 3S1) transitions of ions of the HeI isoelectronic sequence, we have recorded satellite lines arising from ions in the LiI, BeI and Bt isoelectronic sequences. These satellite features are most prominent in the iron spectrum. Apparent decreases in the ratio of forbidden and intersystem line intensities of Mgxl and Sixm during the flare are used to derive electron densities possibly as high as 1 • 1018 cm -3 in the Mgxx emitting region and 1 • 1014 cm -3 in the Sixiti region during the event. A search for satellite lines on the long-wavelength side of the Lyman-alpha line of HI-like ions has yielded no positive identifications.