The finite Fourier transform definition of an edge on the solar disk.
Abstract
A technique for locating the edge of the sun is proposed. The technique uses a finite Fourier transform of the observed limb-darkening function to achieve reduced sensitivity to atmospheric and instrumental effects and heightened sensitivity to the shape of the intrinsic limb-darkening function. A theory is developed that predicts these sensitivities. In order to facilitate wider application, general relations are calculated. A testing program which complements the theory is also reported. The location of the edge is shown to be influenced only by solar phenomena down to the milli-arcsecond range.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 1975
- DOI:
- 10.1086/153814
- Bibcode:
- 1975ApJ...200..484H
- Keywords:
-
- Atmospheric Effects;
- Fourier Transformation;
- Instrument Errors;
- Limb Darkening;
- Mathematical Models;
- Solar Limb;
- Gauss Equation;
- Graphs (Charts);
- Hermitian Polynomial;
- Integral Equations;
- Taylor Series;
- Transfer Functions;
- Solar Physics