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Title:
On the solar rotation and activity
Authors:
Brajša, R.; Wöhl, H.; Ruždjak, D.; Vršnak, B.; Verbanac, G.; Svalgaard, L.; Hochedez, J.-F.
Affiliation:
AA(Hvar Observatory, Faculty of Geodesy, University of Zagreb, Kačićeva 26, HR-10000 Zagreb, Croatia), AB(Kiepenheuer-Institut für Sonnenphysik, Schöneckstr. 6, D-79104 Freiburg, Germany), AC(Hvar Observatory, Faculty of Geodesy, University of Zagreb, Kačićeva 26, HR-10000 Zagreb, Croatia), AD(Hvar Observatory, Faculty of Geodesy, University of Zagreb, Kačićeva 26, HR-10000 Zagreb, Croatia), AE(Geophysical Institute, Faculty of Science, University of Zagreb, Horvatovac bb, HR-10000 Zagreb, Croatia), AF(Easy Toolkit, Inc., Houston, Texas, USA), AG(Observatoire Royal de Belgique, Ave. Circulaire 3, B-1180 Bruxelles, Belgium)
Publication:
Astronomische Nachrichten, Vol.328, Issue 10, p.1013 (AN Homepage)
Publication Date:
12/2007
Origin:
AN
Keywords:
Sun: activity, Sun: rotation
DOI:
10.1002/asna.200710867
Bibliographic Code:
2007AN....328.1013B

Abstract

The interaction between differential rotation and magnetic fields in the solar convection zone was recently modelled by Brun (2004). One consequence of that model is that the Maxwell stresses can oppose the Reynolds stresses, and thus contribute to the transport of the angular momentum towards the solar poles, leading to a reduced differential rotation. So, when magnetic fields are weaker, a more pronounced differential rotation can be expected, yielding a higher rotation velocity at low latitudes taken on the average. This hypothesis is consistent with the behaviour of the solar rotation during the Maunder minimum. In this work we search for similar signatures of the relationship between the solar activity and rotation determined tracing sunspot groups and coronal bright points. We use the extended Greenwich data set (1878-1981) and a series of full-disc solar images taken at 28.4 nm with the EIT instrument on the SOHO spacecraft (1998-2000). We investigate the dependence of the solar rotation on the solar activity (described by the relative sunspot number) and the interplanetary magnetic field (calculated from the interdiurnal variability index). Possible rotational signatures of two weak solar activity cycles at the beginning of the 20th century (Gleissberg minimum) are discussed.
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