Solar Cycle, Solar Rotation and Large-Scale Circulation

  • R. Howard
Part of the Astrophysics and Space Science Library book series (ASSL, volume 69)


The periodic variation in intensity or number of the various manifestations of solar activity is referred to as the solar activity cycle. Examples of features or indices that show such variations are: Wolf Number (Sunspot cycle), plages, prominences, 2800 MHz radio emission and flares. The period of this cyclic variation is approximately 11 yr (11-yr cycle), although in this century the average period has been closer to 10 yr.


Solar Activity Solar Cycle Solar Phys Differential Rotation Sunspot Cycle 
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© D. Reidel Publishing Company, Dordrecht, Holland 1977

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  • R. Howard

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