The Sun as a Variable Star: Solar and Stellar Irradiance Variations
Abstract
The main objective of this Colloquium was to review the most recent results on the observations, theoretical interpretations, empirical and physical models of the variations observed in solar and stellar irradiances, as well as on Sun-climate connections. The Colloquium was divided into six sessions as defined by the key topics. Included for each session were the 36 invited talks and 110 contributed poster papers. A special session of the Solar Electromagnetic Radiation Study for Solar Cycle 22 (SOLERS22) was held on 25 Jun. 1993, where the five working groups discussed their progress and future plans on measuring the absolute value of solar total and spectral irradiances and studying their temporal variations. Papers on both theoretical models and solar irradiance observations have shown that the solar energy output changes on different time scales: the short-term (from minutes to months) variations are related to surface modulations mainly caused by the evolution of active regions, the solar cycle related long-term variations are directly linked with the evolution of magnetic fields over the activity cycle, while the secular variations over centuries are associated with long-term modulations.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- January 1994
- Bibcode:
- 1994STIN...9671752P
- Keywords:
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- Solar Radiation;
- Stellar Radiation;
- Variable Stars;
- Solar Activity Effects;
- Solar Spectra;
- Electromagnetic Radiation;
- Solar Magnetic Field;
- Secular Variations;
- Eureca (Esa);
- Japanese Space Program;
- Nasa Space Programs;
- Irradiance;
- Upper Atmosphere Research Satellite (Uars);
- Stellar Luminosity;
- Solar Physics