The widths of narrow lines in the spectrum of the low chromosphere, measured at the total eclipse of February 25, 1952
Abstract
The spectrum of the chromosphere was photographed at the total solar eclipse of 25th February, 1952, with a slit spectrograph, using the second order of a 6-in. Rowland concave grating. Line widths were measured in both ultra-violet and yellow. Both regions show ξ 0 near 2·5 km per sec. for heavy elements in the lowest chromosphere (average line of sight velocity about 1·8 km per sec.), in close agreement with measures made at the 1940 eclipse. There is some evidence for a small increase of velocity with height.
- Publication:
-
Vistas in Astronomy
- Pub Date:
- 1955
- DOI:
- 10.1016/0083-6656(55)90089-1
- Bibcode:
- 1955VA......1..713R