Reversed Field Configuration in Force-Free State

Abstract

Two reversed field configurations in force-free state of rot B=αB have been considered; one is a straight cylindrical configuration with α(r) dependent on radial coordinate r and the other is a toroidal one.
The cylindrical configuration is obtained by choosing functional form of α(r) in such a way that it closely match experimental results.
The toroidal configuration is analyzed by using an expansion procedure. A new description of F-Θ diagram has been introduced in order to explain experiments.