New estimations of the relation between the alpha-effect and magnetic field fluctuations
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad Nacional Autónoma de México
2000
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| _version_ | 1876486394412531712 |
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| author | N. A. Silant´ev |
| author_facet | N. A. Silant´ev |
| contents | New estimations of the relation between the alpha-effect and magnetic field fluctuations N. A. Silant´ev Física, Astronomía y Matemáticas MHD MAGNETIC FIELDS It is shown that the \exact" Diamond-Vainshtein formula connecting thealpha-e ect coecient with the correlator of magnetic eld uctuations is not valid.Instead, the analogous formula with turbulent di usivity is proposed but only asa crude approximate relation. Two exact integral relations connecting the meanmagnetic eld and its uctuating part in steady state between the magnetic eldand a turbulent velocity eld are derived from the equations of magnetohydrody-namics. These relations may be used by numerical simulations of the magneticeld evolution to check the accuracy of the calculations. The new estimation of thealpha-coecient permits the e ective dynamo mechanism of enhancement of themean magnetic eld in turbulent conducting media, even for a moderate level ofmagnetic uctuations. 2000 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57100925 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.9 |
| format | Artículo científico |
| id | redalyc_57100925 |
| institution | Redalyc |
| language | en |
| publishDate | 2000 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | New estimations of the relation between the alpha-effect and magnetic field fluctuations N. A. Silant´ev Física, Astronomía y Matemáticas MHD MAGNETIC FIELDS New estimations of the relation between the alpha-effect and magnetic field fluctuations N. A. Silant´ev Física, Astronomía y Matemáticas MHD MAGNETIC FIELDS It is shown that the \exact" Diamond-Vainshtein formula connecting thealpha-e ect coecient with the correlator of magnetic eld uctuations is not valid.Instead, the analogous formula with turbulent di usivity is proposed but only asa crude approximate relation. Two exact integral relations connecting the meanmagnetic eld and its uctuating part in steady state between the magnetic eldand a turbulent velocity eld are derived from the equations of magnetohydrody-namics. These relations may be used by numerical simulations of the magneticeld evolution to check the accuracy of the calculations. The new estimation of thealpha-coecient permits the e ective dynamo mechanism of enhancement of themean magnetic eld in turbulent conducting media, even for a moderate level ofmagnetic uctuations. 2000 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57100925 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.9 |
| title | New estimations of the relation between the alpha-effect and magnetic field fluctuations |
| topic | Física, Astronomía y Matemáticas MHD MAGNETIC FIELDS |
| url | https://www.redalyc.org/articulo.oa?id=57100925 |