Center-to-limb variation of the network bright points in the solar photosphere
Abstract
A set of very high resolution photographs is used to analyze in detail the center-to-limb variation (CLV) of the contrast of the network bright points (NBPs) which form the photospheric network. The observations were made along the equator, away from active regions. On an average, the contrast increases from 8 percent at the disk center to 27 percent at mu = 0.3 and then decreases closer to the limb. However, because most NBPs disappear selectively toward the limb, this CLV is not representative of a characteristic point. A significant CLV of the contrast can be obtained only for the brightest, medium size NBPs (0.4-0.7 arcsec), their contrast measured with a 0.23-arcsec resolution increases from 22 percent at the center of the disk to 40 percent at mu = 0.4 and then decreases closer to the limb.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 1991
- Bibcode:
- 1991A&A...246..264A
- Keywords:
-
- Photosphere;
- Solar Atmosphere;
- Solar Magnetic Field;
- Faculae;
- Solar Limb;
- Solar Physics