On the nonaxisymmetricity of the sunspot distribution: kinematic frame constructions and their implications

Details On the nonaxisymmetricity of the sunspot distribution: kinematic frame constructions and their implications On the nonaxisymmetricity of the sunspot distribution: kinematic frame constructions and their implications

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...8e..57k&link_type=abstract

Solar and Stellar Activity Cycles, 26th meeting of the IAU, Joint Discussion 8, 17-18 August 2006, Prague, Czech Republic, JD08,

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Using the Greenwich sunspot data for 120 years it was recently observed that activity regions on the solar surface tend to lie along smoothly changing longitude strips 180 degrees apart from each other. These new claims are based on an analysis method which uses certain kinematic frame parameterization to "filter off" the effects of the solar differential rotation. In this poster we present a systematic analysis of such kinematic frames and the resulting longitudinal distributions of sunspots. We show that these kind of frames can indeed be useful, for example to construct simple statistical methods to estimate the coherence times of short-lived longitudinally concentrated structures on the solar surface. We find, however, no evidence for century-scale persistent two active longitudes in any frame system investigated (rigidly nor differentially rotating). The parameter space is full of combinations producing any precrafted form (the bimodal form has deserved the most attention as it is equivalent of two active longitudes found in active rapid rotators) of longitudinal distribution desired; all these solutions, however, appear as pure statistical fluctuations.

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