Solar radiation and solar differential rotation
Abstract
Sunspot areas and positions obtained from the Greenwhich Photoheliographic Results for 1874-1976, and typical intensities of the umbrae and penubrae, have been used to determined daily values of the solar flux at 500 nm wavelength. Overlapping time series of 512 days each are used to obtain solar rotation periods by Fourier transformation, and the periods are shown to depend upon the phase of the solar activity cycle. Sources of error involving the faculae or the variation of the umbral intensity within the activity cycle are considered.
- Publication:
-
Solar Physics
- Pub Date:
- 1987
- DOI:
- 10.1007/BF00193077
- Bibcode:
- 1987SoPh..114..181W
- Keywords:
-
- Solar Cycles;
- Solar Radiation;
- Solar Rotation;
- Penumbras;
- Power Spectra;
- Solar Flux;
- Sunspots;
- Umbras;
- Solar Physics