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The existence of the radial component of the electric current flowing toward the Sun is revealed in numerical simulation. The total strength of the radial current is3 10 9 A. The only way to full the electric current continuity is to close the radial electric current by means of eld- aligned currents at the polar region of the Sun. Thus, the surface density of the closure current flowing along the solar surface can be estimated as 4 A/m, and the magnetic eld produced by this current is B 5 10 6 T, i.e. several percent of the intrinsic magnetic eld of the Sun. This seems to mean that any treatment of the solar magnetic eld generation should take into account the heliospheric current circuit as well as the currents flowing inside the Sun.

MHD simulation of the three-dimensional structure of the heliospheric current sheet