The Si IV λ 1393 line in a coronal hole compared to the quiet Sun from OSO-8 observations
Abstract
We report on studies of the λ 1393 line of Si IV, formed in the transition region at about 80 000 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 difference in the broadening mechanism. There is no evidence that the line is Doppler shifted in coronal holes relative to the quiet Sun implying there is no mass flow in holes, at the 80 000 K level, greater than 4.3 km s−1. Within the uncertainty of our experiment the integrated line intensities are the same in a coronal hole as in the quiet Sun.
- Publication:
-
Solar Physics
- Pub Date:
- August 1977
- DOI:
- 10.1007/BF00160289
- Bibcode:
- 1977SoPh...53..465F
- Keywords:
-
- Silicon;
- Solar Corona;
- Spaceborne Astronomy;
- Ultraviolet Spectroscopy;
- Emission Spectra;
- Luminous Intensity;
- Oso-8;
- Spectral Line Width;
- Solar Physics;
- Mass Flow;
- Transition Region;
- Line Width;
- Line Intensity;
- Coronal Hole;
- Extreme UV:Solar Corona;
- Solar Coronal Holes