A Re-evaluation of the Granular Δ Irms
Abstract
The degradation of observed granular intensity fluctuations is determined by the combined point spread function of the instrument and the atmosphere, or by its Fourier transform, the modulation transfer function. Empirically determined point spread functions are characterized by a narrow "core" determining the size of the smallest details observable, and extended "wings" influencing the contrast level of observed small- and intermediate-scale structures. This contribution discusses the extent to which the presence of these wings has been properly corrected for in the paper by Deubner and Mattig (1975).
- Publication:
-
Small-Scale Dynamical Processes in Quiet Stellar Atmospheres
- Pub Date:
- 1984
- Bibcode:
- 1984ssdp.conf..174N