On the Occurrence of Convective Motions in the Upper Photosphere
Abstract
We have examined whether the motion field in the photosphere in the range of optical depths 0.25< τ0< 0.6 is dominated by thermal convection or by vibrations. The observed asymmetries of infrared Fraunhofer lines indicate the presence of motions, and the fact that the asymmetry is zero for lines of low excitation and increases with the excitation potential shows that these motions are chiefly convective in this part of the photosphere: upward moving elements appear to be hotter than downward moving ones.
- Publication:
-
Solar Physics
- Pub Date:
- August 1968
- DOI:
- 10.1007/BF00147903
- Bibcode:
- 1968SoPh....4..379D
- Keywords:
-
- Convection;
- Temperature Difference;
- Recent Result;
- Present Author;
- Optical Depth