Abstract
It is generally assumed that magnetic fields inside interplanetary magnetic clouds and flux ropes in the solar photosphere are force-free. In order to model such fields, the solution of rot B = α B is commonly used where α = const. But comparisons of this solutions with observations show significant difference. To treat this problem,we examine the solutions with α = α 0 / ( 1 + r / r 0 ) 3 / 2 .
Published Version
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