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http://hdl.handle.net/2248/2755
Title: | A model of the 'steady' and 'fluctuating' parts of the sun's internal magnetic field |
Authors: | Gokhale, M. H Hiremath, K. M |
Keywords: | Solar interior Solar magnetic field Solar physics Solar rotation Helioseismology Stellar models |
Issue Date: | 10-Apr-1993 |
Publisher: | American Astronomical Society |
Citation: | Astrophysical Journal, Vol. 407, No. 1, Part 1, pp. 359 - 366 |
Abstract: | We model the structure of the 'steady' (slowest varying) part of the sun's internal poloidal magnetic field assuming it to be (for given reasons and in the relevant domain) a current-free field whose field lines 'isorotate' according to the sun's internal rotation given by helioseismology. This part of the field can be described as that of a central dipole and a central hexapole both parallel to the rotation axis and embedded in a uniform external field. The field structure contains a critical surface (running along the base of the convection zone in the low latitudes), where a discontinuity of about 7 nHz per unit flux in the gradient of rotation may be winding a poloidal field into a toroidal field about 2 MG in about 10 exp 5 - 10 exp 9 yr. Small deviations from isorotation indicate presence of MHD perturbations whose latitude structure and time scales may be similar to those dominant in the solar cycle. |
URI: | http://hdl.handle.net/2248/2755 |
ISSN: | 0004-637X |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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Gokhale.pdf | 1.36 MB | Adobe PDF | View/Open |
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