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On the long-term evolution of small-scale solar feature: The faculae

Anett Elek - University of Debrecen; Robertus Erdelyi - University of Sheffield, United Kingdom; Marianna Korsos - University of Wales, United Kingdom; Norbert Gyenge - University of Sheffield, United Kingdom

Session: The Solar Sources of Space Weather


The appearance and properties of solar faculae in the lower solar atmosphere are strongly connected to the highly localised magnetic fields of the Sun. Thus, faculae may be employed as "test particles" for checking out or validating the applicability of a solar dynamo theory. Faculae show the well-known global butterfly diagram, i.e. both the 11- and 22-year cycle. Although faculae do not have as strong magnetic fields as sunspots but investigating their spatial and temporal distributions reveal a clear non-axisymmetric behaviour. We report finding facular structural patterns that indicate the presence of dynamo processes operating on scales of a year and found signatures of even shorter cyclic magnetic field generation mechanisms. Facular migration patterns toward the solar poles are analysed and evidence of low-band standing wave patterns will also be discussed. Further, signatures for an active longitude of faculae will also be presented and critically addressed given the controversy about the true presence of such patterns. Our results may be the base of a new solar dynamo model.

Approaching deadlines:

Registration opens:

16 July 2020

Abstract submission opens:

16 July 2020

European Space Weather Medals:

6 September 2020

Registration deadline:

25 September 2020

Registration deadline: [extended]

10 October 2020

Abstract submission deadline:

4 September 2020