The height variation of granular and oscillatory velocities.
Abstract
Previous observations of spatially-resolved vertical velocity variations in ten lines of Fe I spanning the height range 0 ≲ h ≲ 1000 km are re-analyzed using velocity weighting functions. The amplitudes and scale heights of granular and oscillatory velocities are determined, as well as those of the remaining unresolved velocities. I find that the optimal representation of the amplitude of the outward-decreasing granular velocities is an exponentially decreasing function of height, with a scale height of 150 km and a velocity at zero height of 1.27 km s−1. The optimal representation of the same quantities for oscillatory velocities is an exponential increase with height, with a scale height of 1100 km and a velocity at zero height of 0.35 km s−1. The remaining unresolved velocities decrease with height, with a scale height of 380 km and a velocity at zero height of 2.3 km s−1.
- Publication:
-
Solar Physics
- Pub Date:
- November 1976
- DOI:
- 10.1007/BF00155287
- Bibcode:
- 1976SoPh...50..239C
- Keywords:
-
- Line Spectra;
- Photosphere;
- Solar Atmosphere;
- Solar Granulation;
- Solar Spectra;
- Velocity Distribution;
- Chromosphere;
- Iron;
- Perturbation Theory;
- Spectrum Analysis;
- Vertical Distribution;
- Weighting Functions;
- Solar Physics;
- Weighting Function;
- Vertical Velocity;
- Optimal Representation;
- Velocity Variation;
- Exponential Increase