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Solar Activity

  • Z. Mouradian
Conference paper
Part of the NATO Science Series book series (ASIC, volume 558)

Abstract

In this lecture, we start with a short introduction and give a few references for future study. Then we introduce two criteria to distinguish the quiet from the active sun: these are respectively the permanence of the structures and the presence of an inversion line of magnetic field background. In the third part we describe a few structures of the quiet sun that vary as a function of the solar activity cycle. We then discuss the two typical active sun sites: prominences and active regions. These sites usually evolve quietly until some transient event triggers an acceleration. Such transient events are the sudden disappearance of a prominence and, for active regions, flares and associated phenomena. At the end of the lecture we explain the activity indices and activity mapping, the 11-, 22- and 100-year solar activity cycles, and their effect on the quiet sun, with solar variability. We finish with a few comments on the solar-stellar relation.

Keywords

Solar Activity Solar Cycle Coronal Mass Ejection Solar Phys Sunspot Group 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 2000

Authors and Affiliations

  • Z. Mouradian
    • 1
  1. 1.Observatoire de ParisMeudonFrance

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