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Issue A&A
Volume 398, Number 3, February II 2003
Page(s) 801 - 807
Section Cosmology
DOI http://dx.doi.org/10.1051/0004-6361:20021691



A&A 398, 801-807 (2003)
DOI: 10.1051/0004-6361:20021691

A force-free field with constant alpha in an oblate cylinder: A generalization of the Lundquist solution

M. Vandas1 and E. P. Romashets2

1  Astronomical Institute, Academy of Sciences, Bocní II 1401, 141 31 Praha 4, Czech Republic
    e-mail: vandas@ig.cas.cz
2  Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences, Troitsk, Moscow Region, 142190, Russia
    e-mail: romash@izmiran.rssi.ru

(Received 10 September 2002 / Accepted 30 October 2002 )

Abstract
A force-free magnetic field with constant alpha for a circular cylindrical flux rope (Lundquist solution) is widely used to describe the magnetic field configuration in interplanetary flux ropes. Observations as well as MHD simulations indicate that interplanetary flux ropes are not circular but have an oblate shape. Here we present an analytical solution for a force-free magnetic field with constant alpha in an elliptic flux rope which may be regarded as a direct generalization of the Lundquist solution. An alternative simpler solution for a force-free magnetic field with constant alpha in an oblate flux rope is discussed.


Key words: magnetic fields -- Sun: coronal mass ejections (CMEs)

Offprint request: M. Vandas, vandas@ig.cas.cz




© ESO 2003


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