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Flux Ropes Embedded In A Radial Magnetic Field: Analytic Solutions For The External Magnetic Field

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Abstract

We present a new exact solution of the magnetostatic equations, describing a flux rope embedded in a radial magnetic field. Its axis is perpendicular to the radial direction and parallel to the ecliptic plane and it has a radius r 0 and an arbitrary angular distance θ0 to the polar axis of the Sun. We outline the general method of how one can gain a new solution of the magnetostatic equations by rotating the vector potential of a known solution by an angle θ0 in the r−θ plane. Using the flux-rope solution, a construction procedure for an approximate solution which describes a torus around the polar axis and which is embedded in a radial magnetic field is given. The method has considerable potential as a tool for initializing numerical simulations.

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Schmidt, J.M. Flux Ropes Embedded In A Radial Magnetic Field: Analytic Solutions For The External Magnetic Field. Solar Physics 197, 135–148 (2000). https://doi.org/10.1023/A:1026547911807

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