Inversion method for deriving physical properties of subsurface magnetic field from surface magnetic field evolution
We presented a method for solving an inverse problem of flux emergence that transports subsurface magnetic field from the invisible solar interior to the solar atmosphere, thereby producing active regions on the Sun. A key feature of this method is to introduce flux-emergence function characterizeing how the flux emergence proceeds. Using this function we derived physical properties of the subsurface field from observed evolution of the surface field via the inversion applied to an evolutionary relation between two observables, emerged magnetic flux and injected relative magnetic helicity. The evolutionary relation between these two quantities may be used for quantitative classification of active regions.
Reference
Magara, T.
Journal of the Korean Astronomical Society, 50, 179
