Chirality of the Magnetic Field in Solar Filaments
Takashi Sakurai
National Astronomical Observatory of Japan
Main category
Natural Sciences (Astrophysics and Astrononmy)
The fine structure in solar filaments has been known to show the chiral nature depending on the hemisphere, and it is presumed to be a manifestation of the helicity in the magnetic field generated by the solar dynamo. To investigate the chirality of the filament magnetic field, we carried out a statistical study of the magnetic field orientation in solar filaments based on our daily full-Sun, full-Stokes spectropolarimetric observations with the He I 10830 line. The analysis of more than 400 filaments revealed that the average direction of the magnetic field in filaments generally deviates from their axis by 10-30 degrees, and the direction of the deviation strongly depends on the hemisphere where the filaments appear. This hemispheric pattern is consistent with the well-known chirality pattern of the fine structure seen in filaments, and for some of the filaments we can confirm that the magnetic field direction is parallel to their fine structure.
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