An ambiguity-free determination of Jz in solar active regions
M. Semel and
Received 11 July 1996 / Accepted 24 July 1997
We propose a way to derive a radial electric current density from vector magnetograms that is free of any particular choice of the two possible azimuths for the plane of the sky field. The method is applied to active region data obtained with the Advanced Stokes Polarimeter (ASP). A comparison of this current density with that derived for two particular sets of possible azimuth assignments allows one to evaluate the appropriateness of each set. In addition one may verify the detection of currents in general and the occurrence of current sheets, i.e. field discontinuities, in particular.
Key words: Sun: magnetic fields; plages; sunspots
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© European Southern Observatory (ESO) 1998
Online publication: February 4, 1998