Abstract
Solar active longitudes show a characteristic migration pattern in the Carrington coordinate system if they can be identified at all. By following this migration, the longitudinal activity distribution around the center of the band can be determined. The half-width of the distribution is found to be varying in Cycles 21 – 23, and in some time intervals it was as narrow as 20 – 30 degrees. It was more extended around a maximum but it was also narrow when the activity jumped to the opposite longitude. Flux emergence exhibited a quasi-periodic variation within the active zone with a period of about 1.3 years. The path of the active-longitude migration does not support the view that it might be associated with the 11-year solar cycle. These results were obtained for a limited time interval of a few solar cycles and, bearing in mind uncertainties of the migration-path definition, are only indicative. For the major fraction of the dataset no systematic active longitudes were found. Sporadic migration of active longitudes was identified only for Cycles 21 – 22 in the northern hemisphere and Cycle 23 in the southern hemisphere.
Solar Origins of Space Weather and Space Climate
Guest Editors: I. González Hernández, R. Komm, and A. Pevtsov
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Gyenge, N., Baranyi, T., Ludmány, A. (2013). Migration and Extension of Solar Active Longitudinal Zones. In: González Hernández, I., Komm, R., Pevtsov, A., Leibacher, J. (eds) Solar Origins of Space Weather and Space Climate. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-1182-0_10
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