Vertical Gradients of the Magnetic Fields in Active Regions

Details Vertical Gradients of the Magnetic Fields in Active Regions Vertical Gradients of the Magnetic Fields in Active Regions

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..168...65g&link_type=abstract

Solar Physics, Volume 168, Issue 1, pp.65-74

Physics

2

Scientific paper

In this paper, we describe the results of an investigation of magnetic field structures in two active regions. The photospheric magnetic fields were measured simultaneously in all three components with the Crimean vector magnetograph in the Fe i 5250 line. In our analysis, we compare the observed magnetic field with the potential field. The potential field vector was calculated according to the potential-field theory, and the H z component was taken as a boundary condition. From these data vertical gradients are calculated from the condition div H = 0. Averaged gradients of both fields increase with the H z field intensity and within the error limits they do not differ from one another for field strengths up to ≈ 1200 G. For larger H z the potential field gradients become higher than those of the observed field. In large spots, observed field gradients are about two times less than those of the potential field. It is shown that this difference is connected with the observed field twisting.

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