Half-Turn Rotation of a Polarity Inversion Line and Associated Quadrupolar-Like Structure in the Sun

Details Half-Turn Rotation of a Polarity Inversion Line and Associated Quadrupolar-Like Structure in the Sun Half-Turn Rotation of a Polarity Inversion Line and Associated Quadrupolar-Like Structure in the Sun

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jkas...44..143m&link_type=abstract

Journal of the Korean Astronomical Society, vol. 44, no. 5, pp. 143-150

Astronomy and Astrophysics

Astronomy

1

Sun: Magnetic Topology, Sun: Surface Magnetism, Magnetohydrodynamics, Methods: Numerical

Scientific paper

This paper reports a characteristic motion of a polarity inversion line (PIL) formed at the solar surface, which is newly found by performing a three-dimensional magnetohydrodynamic simulation of flux emergence in the Sun. A magnetic flux tube composed of twisted field lines is assumed to emerge below the surface, forming a bipolar region with a PIL at the surface. A key finding is the successive half-turn rotation of the PIL, leading to the formation of a quadrupolar-like region at the surface and a magnetic configuration in the corona; this configuration is reminiscent of, but essentially different from the so-called inverse-polarity configuration of a filament magnetic field. We discuss a physical mechanism for producing the half-turn rotation of a PIL, which gives new insights into the magnetic structure formed via flux emergence. This presents a reasonable explanation of the configuration of a filament magnetic field suggested by observations.

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