2008/01/15 by A. Brandenburg, E. A. Spiegel, E.A. Spiegel · 2 citations
Biochemistry, Genetics and Molecular Biology · Engineering · Physics and Astronomy · #Fluid dynamics and aerodynamics studies #Geomagnetism and Paleomagnetism Studies #Solar and Space Plasma Dynamics #astro-ph
paper · pdf · doi:10.1002/asna.200810973
published as Astron. Nachr. 329, 351-358 (2008) · 8 pages, 6 figures, Astron. Nachr. (submitted)
arxiv created 2008/01/15 · openalex publication_date 2008/04/08 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Abstract We introduce on/off intermittency into a mean field dynamo model by imposing stochastic fluctuations in either the alpha effect or through the inclusion of a fluctuating electromotive force. Sufficiently strong small scale fluctuations with time scales of the order of 0.3–3 years can produce long term variations in the system on time scales of the order of hundreds of years. However, global suppression of magnetic activity in both hemispheres at once was not observed. The variation of the magnetic field does not resemble that of the sunspot number, but is more reminiscent of the 10 Be record. The interpretation of our results focuses attention on the connection between the level of magnetic activity and the sunspot number, an issue that must be elucidated if long term solar effects are to be well understood. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)