The Solar Cycle

  • Claudio Vita-FinziEmail author
Part of the SpringerBriefs in Astronomy book series (BRIEFSASTRON)


The ~11-year solar cycle was first identified in the fluctuation of the number and location of sunspots and, soon after, their magnetic polarity and the dipole component of the Sun’s magnetism as a whole. The cycle is manifested in satellite records of total and variable solar luminosity, in the open solar magnetic flux, which can be estimated from solar observation or from the aa geomagnetic index, and in the Sun’s radio emission The incidence of flares and coronal mass ejections is linked to the cycle in complex fashion. The Babcock model of sunspot generation relates the cycle to twisting of magnetic field lines by differential solar rotation; deeper links to internal dynamics are revealed by neutrino data. Periodicities which were not obvious when solar observation was limited to the photosphere may turn out to be more significant as regards the solar interior than the Schwabe or Hale cycle.


Hale cycle TSI Babcock model Solar minimum Spörer Wolf E10.7 


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Copyright information

© The Author(s) 2013

Authors and Affiliations

  1. 1.Department of MineralogyNatural History MuseumLondonUK

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