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Densities in the quiet sun and coronal holes using EUV emission lines

✍ Scribed by Bhola N. Dwivedi

Publisher: Springer
Year: 1989
Tongue: English
Weight: 336 KB
Volume: 124
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00146527

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✦ Synopsis

The density dependence of solar EUV line intensity ratios from Mg VIII, Si VII, S IX and Si IX ions have been used to determine electron densities in the quiet Sun and coronal holes. The line intensity values have been computed using a model atmosphere of Kopp and Orrall (1976) in order to emphasize the utility of the lines studied which could be compared with observational data that future missions might provide.

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✍ Michael H. Francis; Robert Roussel-Dupré 📂 Article 📅 1977 🏛 Springer 🌐 English ⚖ 247 KB

We report on studies of the k 1393 line of Si ix, lormed in the transition region at about 8(I 000 K, made using the Colorado experiment on OSO-8. Results indicate that the line width is somewhat greater in coronal holes compared to the quiet Sun, implying a dilterence in the broadening mechanism. T