Comprehensive graded-height spectra of solar prominences.
Abstract
A program on prominence spectra is being carried out at the Climax station of High Altitude Observatory by David Dodgen, Richard Hansen and Keith Watson. Spectra are being obtained showing the following lines: Hydrogen Ha, Hp, H~, 118, He; He 6678, 5876, 4713, 4686, 4471, 4o26; Caii H and K; and Mg triplet at 5i8oA; as well as occasional other lines. At each wave length intensities with absolute standardization at a series of heights at intervals of 58oo km are obtained. In some cases the spectra extend up to 200,000 km. A number of spectra have already been obtained, of both quiescent and active prominences. The temperature of these has been obtained by several different methods, viz.: Doppler profiles, the Balmer decrement, the 6678/D3 ratio, and the 4686/6678 ratio. This work was supported by the Geophysics Research Directorate, the Air Force Cambridge Research Center. High A ltitude Observatory, Boulder, Colo.
- Publication:
-
The Astronomical Journal
- Pub Date:
- February 1957
- DOI:
- 10.1086/107455
- Bibcode:
- 1957AJ.....62...42Z