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Circuit models involving bulk currents and inductances are often used to estimate the energies of coronal magnetic field configurations,
in particular configurations associated with solar flares. The accuracy of circuit models is tested by comparing calculated
energies of linear force-free fields with specified boundary conditions with corresponding circuit estimates. The circuit
models are found to provide reasonable (order of magnitude) estimates for the energies of the non-potential components of
the fields, and to reproduce observed functional dependences of the energies. However, substantial departure from the circuit
estimates is observed for large values of the force-free parameter, and this is attributed to the influence of the non-potential
component of the field on the path taken by the current. 相似文献
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