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Revealing of periodicities in the variations of differential rotation of the Sun
Author(s) -
Gigolashvili M. Sh.,
Gogoladze N. A.,
Khutsishvili E. V.
Publication year - 1995
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.2103160505
Subject(s) - differential rotation , asymmetry , physics , solar rotation , rotation (mathematics) , astrophysics , differential (mechanical device) , noise (video) , spots , solar physics , geometry , stars , mathematics , biology , botany , quantum mechanics , artificial intelligence , computer science , image (mathematics) , thermodynamics
It is presumed that a north‐southern asymmetry of a solid‐body rotation of large spots, depending on even and odd solar activity cycles (Gigolashvili and Khutsishvili 1 1989, 1990) may possibly be explained by the asymmetry of the appearance of large structures with strong magnetic fields in the corresponding hemispheres. Spectral analysis of the observational data shows the presence of cyclic variations of differential rotation of large‐ and middle‐sized spots. Variations of differential rotation of small spots are either absent or overlapped by noise. It is also supposed that the discovered and most frequently realized component of the spectrum of solar differential rotation variations — a four‐years periodicity — may be either a real phenomenon or the result of overlapping of multiple quasi bi‐annual variations.