Solar Physics

, Volume 52, Issue 1, pp 53–61 | Cite as

The north-south distribution of major solar flare events, sunspot magnetic classes and sunspot areas (1955–1974)

  • J. -René Roy


The north-south incidence has been studied of 31 white-light flares observed since 1859 and of 1669 events meeting the criteria for ‘major flares’ of Dodson and Hedeman (1971) for the period 1955–1974. The asymmetry in favor of the northern hemisphere increases strikingly with the importance of the events. Similarly, magnetically complex sunspot groups (Mt. Wilson classesβγ,γ andδ) display a more pronounced asymmetry in favor of the north than non-complex groups for 1962–1970. Contrary to the flare asymmetry, the spottedness asymmetry is independent of the size of sunspots.


Flare Northern Hemisphere Solar Flare Sunspot Group Sunspot Area 
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Copyright information

© D. Reidel Publishing Company 1977

Authors and Affiliations

  • J. -René Roy
    • 1
  1. 1.Institut Herzberg d'AstrophysiqueConseil national de recherche du CanadaOttawaCanada

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