Adjustment and Focus of Solar Images for Magneto-Optical Filter Observations
Abstract
Provides a more accurate and reliable set of full-disk, high-resolution helioseismic measurements in the M. Wilson-Crimea-Alma-Ata network by ensuring the optimum quality of the solar images which will be generated by each network station. The method of optical layout adjustment is based on real-time, PC-based programs for improving the quality of solar images. The best focus is determined through motion of the camera followed by the checking of the mean inclination angle of the brightness curves in several equi-spaced azimuthal directions. The solar limb shape is adjusted to obtain the minimum standard deviation around the circle through the alignment of the lenses and the video camera. Finally, the camera and the re-imaging lens are positioned so as to have a common image size as well as the optimum focus. As a part of the daily observing procedure, the solar image is focused by another algorithm which is sensitive to the maximum intensity of some bright objects on the solar image.
- Publication:
-
Helioseismology
- Pub Date:
- June 1995
- Bibcode:
- 1995ESASP.376b.201D
- Keywords:
-
- Helioseismology: Methods of Observation;
- Helioseismology: Imaging