✦ LIBER ✦
Plane grating as polar heliostat in eclipse observations of the chromosphere and prominences with special application to studies of Doppler-widened Thomson-scattered Fraunhofer lines
✍ Scribed by Yngve Öhman
- Publisher
- Springer
- Year
- 1979
- Tongue
- English
- Weight
- 368 KB
- Volume
- 62
- Category
- Article
- ISSN
- 0038-0938
No coin nor oath required. For personal study only.
✦ Synopsis
Attention is drawn to a very simple instrumental arrangement for eclipse observations of the spectra of the chromosphere and prominences using a plane grating as polar helios~at and a short focus camera. A discussion is made of an infrared chromospheric spectrum showing traces of Thomsonscattered Ca IX absorption lines in the continuous spectrum. If the effect is real, it indicates a temperature of the order of 5000 K. A simple vector formula is presented describing various types of Doppler effects appearing in radiation scattered by moving particles.