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Persistent Active Longitudes in Sunspot Activity: Sun-as-a-Star Approach

Published online by Cambridge University Press:  26 May 2016

S. V. Berdyugina  and
I. G. Usoskin
S. V. Berdyugina
Affiliation:
Institute of Astronomy, ETHZ, 8092 Zurich, Switzerland Astronomy Division, PO Box 3000, 90014 University of Oulu, Finland
I. G. Usoskin
Affiliation:
Sodankylä Geophysical Observatory (Oulu unit), 90014 University of Oulu, Finland

Abstract

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Using a new Sun-as-a-star approach we analyze sunspot group data for the past 120 years and reveal that sunspots are formed preferably in two persistent migrating active longitudes 180° apart. Their migration is determined by changes of the mean latitude of sunspots and the surface differential rotation. The two active regions periodically alternate being the dominant region with a period of about 3.7 years similar to the “flip-flop” phenomenon known in starspot activity. The fact that the Sun shows the same pattern of magnetic activity as highly active stars strengthens the solar paradigm for magnetic activity on cool stars.

Type
Part 3: The Sun as a Prototype and Laboratory for Stellar Physics
Information
Symposium - International Astronomical Union , Volume 219: Stars as Suns : Activity, Evolution and Planets , 2004 , pp. 128 - 132
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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