Granular-size horizontal velocities in the solar atmosphere
Abstract
Observations of horizontal motions in the granulation of the solar photosphere and the center-to-limb variations are reported. Measurements of the Fe I 5121.649, Cr I 5122.121 and Fe I 5123.730 lines were obtained by the balloon-borne spectro-stratoscope with slit direction tangential to the limb. Following correction for known instrumental effects, rms line velocities are found to increase towards the limb, and to contain a horizontal component approximately twice as large as the vertical component. The results are noted to be in agreement with those of Keil and Canfield (1978) at lower photospheric heights, and those of Beckers and Canfield (1975) at greater photospheric heights.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- March 1981
- Bibcode:
- 1981A&A....96...96M
- Keywords:
-
- Flow Velocity;
- Magnetohydrodynamic Flow;
- Photosphere;
- Solar Atmosphere;
- Solar Granulation;
- Balloon Flight;
- Line Spectra;
- Mean Square Values;
- Solar Limb;
- Solar Physics