An active region quasi-biennial oscillation

Details An active region quasi-biennial oscillation An active region quasi-biennial oscillation

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535..153s&link_type=abstract

In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2

Physics

Solar Active Regions, Quasi-Biennial Oscillations

Scientific paper

A quasi-biennial fluctuation has been detected in the time-series of the sunspot umbra/penumbra (U/P) area ratio on the basis of the Debrecen Photoheliographic Data. The study is based on an intermittent period of nearly eight years; the material comprises more than 18,000 individual sunspots. The present contribution reports preliminary pieces of information about the temporal behaviour of the U/P ratio and period analyses. The physical background of the phenomenon is as yet unclear but it seems to belong to the growing family of mid-term fluctuations.

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