The Relation between the Intensities of Umbra and Penumbra of Large Sunspots
Abstract
Based on pinhole photometer observations in 4-6 wavelength regions we have searched for a connection between the intensities of the umbra and the penumbra of sunspots. For the 1.67 μm wavelength region it is apparent that spots with dark umbrae also have dark penumbrae. In the other wavelength regions similar relations are found. The darkness of the spot is probably connected with the degree of complexity of the spot.
- Publication:
-
Solar Physics
- Pub Date:
- September 1974
- DOI:
- 10.1007/BF00161825
- Bibcode:
- 1974SoPh...38...73E
- Keywords:
-
- Luminous Intensity;
- Penumbras;
- Solar Atmosphere;
- Sunspots;
- Umbras;
- Absorption Spectra;
- Infrared Spectra;
- Line Spectra;
- Photometry;
- Solar Spectra;
- Solar Physics;
- Wavelength Region;
- Similar Relation;
- Photometer Observation;
- Large Sunspot