Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002chjaa...2..174l&link_type=abstract
Chinese Journal of Astronomy & Astrophysics, Vol. 2, p. 174-182
Astronomy and Astrophysics
Astrophysics
6
Sun: Magnetic Fields, Sun: Activity, Sun: Photosphere
Scientific paper
Projection effects in Huairou solar vector magnetograms are corrected by transferring or mapping the observed vector magnetogram in the image plane to the heliographic plane (planar correction) and to the heliospheric coordinate system (spherical correction). The magnetograms after the correction are considerably different. The planar correction and the spherical correction lead to slightly different magnetic configurations, especially when the active region involved is far from the disk center. We also discuss the effects 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 mapping. The mapping generally decreases the average shear angle on the neutral line by several degrees when the active region is in the eastern hemisphere, and increases it when in the western hemisphere. In most of the cases studied, the correction reduces the current helicity imbalance, and sometimes even changes its sign. It is 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 slightly. The accuracy of the magnetic field measurement at Huairou is estimated to be better than 20 G and 150 G for the longitudinal and the transverse component, respectively.
No associations
LandOfFree
Projection Effects on Physical Parameters Obtained from Solar Vector Magnetograms does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Projection Effects on Physical Parameters Obtained from Solar Vector Magnetograms, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Projection Effects on Physical Parameters Obtained from Solar Vector Magnetograms will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-840018