Coronal Magnetograms of Solar Active Regions

Details Coronal Magnetograms of Solar Active Regions Coronal Magnetograms of Solar Active Regions

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spnr.conf..111r&link_type=abstract

Solar Physics with the Nobeyama Radioheliograph, Proceedings of Nobeyama Symposium 2004, held in Kiyosato, Japan, October 26- 29

Physics

Scientific paper

The state of the art in the coronal magnetography through quasi-transverse (QT-) propagation of microwaves is discussed. The measurements are based on the fact that the circular polarization modification depends on the intensity of the magnetic field in the QT-region, where microwaves pass through the magnetic field lines at the right angle. The obtained coronal megnetograms are a series of 2D partial magnetograms, covering on each day a part of the active region. The Nobeyama Radioheliograph provides the coronal magnetograms of 110 - 50 G and the Siberian Solar Radio Telescope those of 30 - 10 G. The first results are encouraging in the sense that the features of the measured coronal magnetograms are consistent with the geometry of the QT-region. Two problems of the coronal magnetography are outlined: (1) the correct identification of QT effects and (2) the determination of the only unknown coordinate, i.e., the QTR height.

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