Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pbeio..38...40l&link_type=abstract
Astrophysics Reports. Publications of the Beijing Astronomical Observatory, No. 38, p. 40 - 48 (2002). In: Proceedings of the Ni
Astronomy and Astrophysics
Astrophysics
Vector Magnetic Field, Projection Effect, Magnetic Shear, Current Helicity
Scientific paper
We made corrections for the projection effects of the Huairou solar vector magnetograms by transferring the observed vector magnetogram in the image plane to the heliographic plane (planar correction) and heliospheric coordinate system (spherical correction). The magnetograms after the correction are considerably different from that in the image plane, and the planar correction and the spherical correction lead to slightly different magnetic configuration, especially when the active region involved is far away from the disk center. We also discuss the influences of the corrections on magnetic activity parameters, such as magnetic shear, current helicity, etc. It is shown that the neutral line is obviously distorted after the transform. The transforms generally decrease the average shear angle on the neutral line when the active region is in the eastern hemisphere, and increase it in the western hemisphere by several degrees. In most of the cases studied, the correction reduces the current helicity imbalance, and sometimes the correction even changes it sign. It was found that the current helicity imbalance may change its sign in its evolution when there are apparent fluxes emerging from the lower photosphere. The corrections increase the noise level of Bz greatly, and decrease the noise level of Bt a little. The accuracy of the magnetic field measurement at Huairou are estimated to the better. The accuracy of the magnetic field measurement at Huairou are estimated to be better than 20 G and 150 G for the longitudinal and the transverse component, respectively.
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