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- W3144367026 abstract "Reliable magnetic field measurements are still restricted to the photosphere and information on chromospheric and coronal magnetic fields stems mainly from the extrapolation of measured photospheric fields. The comparison of extrapolated force-free magnetic fields with chromospheric and coronal observations indicates that in active regions the current helicity, H C = B • ∇ × B, is predominantly negative in the northern and positive in the southern hemisphere. This dependence is presumably a result of the different actions of the Coriolis forces in the two hemispheres. There is a simple relation between current helicity and the α-effect. In the case of amplification of a mean magnetic field by the α-effect (1) both fluctuating and mean magnetic fields possess current helicities, (2) the current helicities of fluctuating and mean magnetic fields have opposite signs and (3) the modulus of the first one exceeds that of the second one. The magnetic fields and currents of active regions as a whole may be considered as fluctuations in the sense of a mean-field theory of the global field of the Sun. Alternatively, properties of the magnetic fields and currents of individual active regions may be ascribed to mean fields. Both possibilities are discussed with reference to the relation between current helicity and the α-effect and the sign rule for the current helicity." @default.
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- W3144367026 date "1990-01-01" @default.
- W3144367026 modified "2023-09-25" @default.
- W3144367026 title "Current helicity and the generation of magnetic field aligned currents." @default.
- W3144367026 hasPublicationYear "1990" @default.
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