Frei zerfallende Magnetfelder von Kugelschalen
The decay constants of free decaying magnetic fields of sphere shells are calculated. In the regionr1<r<r0 the electrical conductivity isσ. For different values of the parameterγ=r0/(r0-r1) the following models are considered: The conductivity is zero forr>r0 andr<r1 (model 1). The conductivity is zero forr>r0, and forr<r1 the magnetic field is excluded by infinite conductivity (model 2). The magnetic field is excluded forr>r0 andr<r1 (model 3).