NASA NTRS · 19780043403
The exterior source surface for force-free fields
Abstract
Consideration is given to the exterior source surface for force-free fields. The spherical harmonic expansion is presented for boundary values on two concentric spheres. An upper limit on a constant which measures the strength of coronal currents is found to be a function of the lowest multipole moment of the prescribed boundary values. The solar atmosphere is in the class of magnetic fields for which the study is applicable.
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Barbosa, D. D.. 1978-01-01. The exterior source surface for force-free fields. https://ntrs.nasa.gov/citations/19780043403
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