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Active Regions

  • M. J. Martres
  • A. Bruzek
Chapter
Part of the Astrophysics and Space Science Library book series (ASSL, volume 69)

Abstract

The terms ‘active’ and ‘activity’ are used in solar physics in a rather general and not well-defined way. Basically, ‘activity’ denotes a marked degree of variability in time associated with enhanced motions, density, temperature, emission etc. It denotes further the occurrence, or frequent occurrence of a certain (transient) phenomenon (e.g. flare activity, surge activity, X-ray activity) or the occurrence of ‘active regions’ (‘solar activity’ in general). Radio activity, for example, can imply both the occurrence of radio bursts and the longer-lasting enhancement of radio emission.

Keywords

Active Region Solar Activity Solar Phys Solar Active Region Spot 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

© D. Reidel Publishing Company, Dordrecht, Holland 1977

Authors and Affiliations

  • M. J. Martres
  • A. Bruzek

There are no affiliations available

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