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

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

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh51a1990m&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH51A-1990

Astronomy and Astrophysics

Astrophysics

[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7531] Solar Physics, Astrophysics, And Astronomy / Prominence Eruptions

Scientific paper

We report a characteristic motion of a polarity inversion line (PIL) formed on the solar surface, which is newly found by performing a three-dimensional simulation of flux emergence on 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 as well as a coronal magnetic configuration that is reminiscent of, but essentially different from the so-called inverse-polarity configuration of filament magnetic field. We discuss a physical mechanism for producing the half-turn rotation of a PIL, which gives a new insight into the magnetic structure formed via flux emergence. This presents a reasonable explanation of the origin and nature of the magnetic field forming a filament whose fine structure has been revealed in detail by recent observations.

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