Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268..749c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 2, p. 749-764.
Astronomy and Astrophysics
Astrophysics
16
Magnetic Field Configurations, Photosphere, Solar Magnetic Field, Astronomical Models, Coordinate Transformations, Force-Free Magnetic Fields
Scientific paper
A relatively simple method for the removal of the 180 deg ambiguity in the azimuth of the observed transverse photospheric magnetic field is proposed; it applies to both center of disk and off-disk center observations. The method consists in selecting that sign which corresponds to a decrease with height of the heliographic magnetic field. For this, the observed field components at a point have to be first transformed into heliographic components and then the selection rule must be applied. After application of the method to simulated observations, heliographic analytical solutions were used as a benchmark test. Both center-of-disk and off-disk-center cases were considered; in the last case, all latitude angles between 0 deg and 90 deg were treated. The results were expressed as percentage of success in determining the correct sign of the observed transverse component as a function of the complexity of the heliographic magnetic field configuration as well as of the value of the latitude angle. In the center of disk case, the percentage of success varies between 100 percent and a minimum of about 90 percent, as depending on the complexity of the magnetic configuration; the performance of the method can be further improved by increasing the number of grid points. In the off disk-center case, the method is limited to relatively low latitude angles.
Cuperman Sami
Li Jiying
Semel Meir
No associations
LandOfFree
Alternative method for the removal of the 180 ambiguity in the sign of the observed transverse photospheric magnetic field 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 Alternative method for the removal of the 180 ambiguity in the sign of the observed transverse photospheric magnetic field, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alternative method for the removal of the 180 ambiguity in the sign of the observed transverse photospheric magnetic field will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1271836