Studies of Granular Velocities. II: Statistical Analysis of Two High-Resolution Spectrograms
Abstract
Continuum brightness and Doppler velocity fluctuations in the lines λ 6301.5 and λ 6302.5 Å of FeI, measured in two selected spectrograms, are analysed by standard statistical (power- and coherence spectrum) methods. It is shown qualitatively that the oscillatory component of the velocity fluctuations (at spatial wavelengths > 4″) decreases, while the supposedly `granular' component (at spatial wavelengths < 4″) as well as the coherence between brightness and velocity fluctuations increases with optical depth.
- Publication:
-
Solar Physics
- Pub Date:
- February 1971
- DOI:
- 10.1007/BF00162468
- Bibcode:
- 1971SoPh...16..253M
- Keywords:
-
- Coherence;
- Power Spectrum;
- Optical Depth;
- Velocity Fluctuation;
- Correction Function