Wound Magnetostatics and Flaring

Authors: Boily C.M.¹; Lynden-Bell D.²

Source: Astrophysics and Space Science, Volume 243, Number 1, 1996 , pp. 29-32(4)

Publisher: Springer

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Abstract:

We discuss the winding of a force-free axisymmetric magnetic field rooted on a heavy conductor on z = 0. In quadrupolar symmetry the field expands in the half-space z > 0 and the toroidal flux concentrates on a conical surface. After a mean twist of 208°, the conical layer hosts large toroidal current loops with reversal of the magnetic flux on either side. The evolution of the field structure is described by scale-free static solutions B ~ r-(p+2), with p taking values between 0 and 2. The large expansion factor of the field structure is suggestive of flaring originating on the solar photosphere.

Keywords: mhd; Solar flares

Language: English

Document Type: Regular paper

Affiliations: 1: I.U.C.A.A., Post Bag 4, Ganeshkhind, Pune 411 007, India 2: Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA

Publication date: 1996-01-01