The effects of viewing angle on the inference of magnetic shear in preflare active regions

Details The effects of viewing angle on the inference of magnetic shear in preflare active regions The effects of viewing angle on the inference of magnetic shear in preflare active regions

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..119...77w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 119, no. 1, 1989, p. 77-86.

Physics

10

Solar Activity, Solar Flares, Solar Magnetic Field, Force-Free Magnetic Fields, Inference, Photosphere

Scientific paper

Analytic models for nonpotential force-free fields representative of preflaring active regions have been used to determine the degree of magnetic shear along the magnetic neutral line of these fields as a function of location and orientation of the active region on the solar disk. The results indicate that, with the exception of regions close to the disk center, the position of the inferred neutral line differs significantly from the actual neutral line. It is suggested that the significant variation of the inferred degree of shear with the position and orientation of the region is due to such factors as geometric projection effects, the shift of the inferred neutral line relative to its true position, and the variations in the reference potential field.

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