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A helicity proxy from horizontal solar flow patterns

Lookup NU author(s): Dr G Rudiger, Professor Axel Brandenburg


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Motivated by new observations of solar surface flow patterns of mesogranulation, theoretical computations of the horizontal divergence-vorticity correlation are presented. Because of its close relation to the helicity in rotating turbulence such observations and discussions are of particular importance for the conventional dynamo theory. For the northern hemisphere we find a small, but always negative, divergence-vorticity correlation. Both an analytical Second Order Correlation Approximation for slow rotation as well as a numerical simulation (originally done for accretion disks) for fast rotation yield very similar results.

Publication metadata

Author(s): Rudiger G, Brandenburg A, Pipin VV

Publication type: Article

Publication status: Published

Journal: Astronomische Nachrichten

Year: 1999

Volume: 320

Issue: 3

Pages: 135-140

Print publication date: 01/07/1999

ISSN (print): 0004-6337

ISSN (electronic): 1521-3994

Publisher: Wiley - V C H Verlag GmbH & Co. KGaA


DOI: 10.1002/1521-3994(199907)320:3<135::AID-ASNA135>3.0.CO;2-7


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