Physics
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...57..267h&link_type=abstract
Solar Physics, vol. 57, Apr. 1978, p. 267-278.
Physics
5
Magnetic Field Configurations, Potential Fields, Solar Corona, Solar Magnetic Field, Sunspots, Circular Polarization, Linear Polarization, Magnetic Measurement, Magnetic Signatures, Polarized Electromagnetic Radiation
Scientific paper
Photospheric line-of-sight and transverse-magnetic-field data obtained, with a vector magnetograph system for an isolated sunspot are described. A study of the linear polarization patterns and of the calculated transverse field lines indicates that the magnetic field of the region is very nearly potential. The H-alpha fibril structures of this region as seen in high-resolution photographs corroborate this conclusion. Consequently, a potential-field calculation is described using the measured line-of-sight fields together with assumed Neumann boundary conditions; both are necessary and sufficient for a unique solution. The computed transverse fields are then compared with the measured transverse fields to verify the potential-field model and assumed boundary values. The implications of these comparisons for the validity of magnetic-field extrapolations using potential theory are discussed.
Hagyard Mona J.
Teuber D.
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