Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993cha%26a..17..423w&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 17, Issue 4, p. 423-430.
Astronomy and Astrophysics
Astrophysics
6
Solar Active Region, Transverse Magnetic Field
Scientific paper
The analyses have been made with the emphasis on four existing criteria for calibrating the azimuth of the photospheric transverse magnetic field measured with a heliomagnetograph. The results indicate that the potential criterion, Krall's criterion, i.e. Bt . ▽Bz < 0 and Wu-Ai's criterion, i.e. ∂Bz/∂z(∂Bx/∂x+∂By/∂y) <= 0, are applicable to different cases, and the criterion based on the assumption about azimuth continuity of the transverse field is unreliable for the magnetograms with discrete data. On the basis of these analyses, a synthesized method for determining the azimuth of the transverse magnetic field on solar photosphere has been suggested in this paper. The main points of the method are as follows:
The transverse magnetic field observed with a heliomagnetograph could be calibrated, respectively, by means of potential criterion and Krall's criterion, and two different results could be obtained. By comparing the both results with one another, we can find that the azimuth distributions of transverse field are the same in some areas, which are named as areas with certain transverse field (CA), and different in other areas, which are named as areas with uncertain transverse field(UA). In order to determine the transverse field in UA, we introduce an assumption that the values of α (the factor of force-free magnetic field) at neighbouring points are close. According to this assumption, the distribution of α in UA could be determined through extrapolating from the CA, and hence the azimuth distribution of the transverse field in UA could be determined as well.
An observational example shown in this paper preliminarily demonstrates the availability of the synthesized method.
Lin Yuan-Zhang
Wang Hua-Ning
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