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Astron. Astrophys. 361, L60-L62 (2000)
Letter to the Editor
Detection of the H I n=22-21 Rydberg line in emission at the solar submillimetre limb
T.A. Clark 1,
D.A. Naylor 2 and
G.R. Davis 3
1 University of Calgary, Calgary, Department of Physics and Astronomy, Alberta T2N 1N4, Canada (taclark@acs.ucalgary.ca)
2 University of Lethbridge, Department of Physics, Lethbridge, Alberta T1K 3M4, Canada (naylor@uleth.ca)
3 University of Saskatchewan, Institute of Space and Atmospheric Studies, 116 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada (G.R.Davis@usask.ca)
Received 10 August 2000 / Accepted 4 September 2000
Abstract
This letter reports the discovery of excess emission at the
position of the HI n=22-21 Rydberg transition in
submillimetre solar spectra taken at the extreme solar limb. This
emission feature at
22.096![[FORMULA]](img1.gif)
0.003 cm-1 shows
significant limb brightening, reaching intensities of 11% above the
adjacent spectral continuum with line shapes fitted best by Gaussian
functions with widths of
0.0180.004 cm-1. This
measurement represents the highest-n Rydberg line of
HI detected to date in the solar spectrum.
Key words: line:
identification 
Sun: atmosphere
Sun: general
Sun: infrared
Send offprint requests to: T.A. Clark
This article contains no SIMBAD objects.
Contents
- 1. Introduction
- 2. Instrumentation and observations
- 3. Data analysis
- 4. Results and discussion
- 5. Conclusions
- Acknowledgements
- References
© European Southern Observatory (ESO) 2000
Online publication: October 10, 2000
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