Bright points in sunspot umbrae: morphology, intensities.
Abstract
The bright point distribution in a sunspot umbra was determined by applying precise photographic photometry to three photographic plates obtained at time intervals of several minutes. The size and intensity distribution along two orthogonal axes is examined. The distance between bright points seems to be about 0.40 arcsec or about 300 km, but if a correction is applied, the distance might be approximately 40 km. While the asymmetric distribution of the bright points seems to indicate that the points have an elongated form, it is suggested that the elongations are composed of a series of more or less circular points which lie close together.
- Publication:
-
Academie des Sciences Paris Comptes Rendus Serie B Sciences Physiques
- Pub Date:
- June 1978
- Bibcode:
- 1978CRASB.286..335A
- Keywords:
-
- Luminous Intensity;
- Photometry;
- Sunspots;
- Umbras;
- Anisotropy;
- Histograms;
- Photographic Recording;
- Radiative Transfer;
- Solar Physics;
- Solar Physics;
- Sunspots:Structure;
- Sunspots: Umbrae