Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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HALF-TURN ROTATION OF A POLARITY INVERSION LINE AND ASSOCIATED QUADRUPOLAR-LIKE STRUCTURE IN THE SUN

  • Magara, Tetsuya (Department of Astronomy and Space Science, School of Space Research, Kyung Hee University) ;
  • An, Jun-Mo (School of Space Research, Kyung Hee University) ;
  • Lee, Hwan-Hee (School of Space Research, Kyung Hee University) ;
  • Kang, Ji-Hye (School of Space Research, Kyung Hee University)
  • Received : 2011.06.08
  • Accepted : 2011.08.05
  • Published : 2011.10.31
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Abstract

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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