Statistical Study of the Magnetic Field in Solar Filaments

We carried out a statistical study of the magnetic field orientation in solar filaments based on our daily full-Sun, full-Stokes spectropolarimetric observations using the He I 10830 line. The analysis of more than 400 filaments revealed that the sense of rotation of the magnetic field direction in filaments with respect to their axes shows strong hemispheric dependence, and that the angle of rotation of the magnetic field concentrates between 10-30 degrees. The hemispheric pattern of the filament magnetic field is consistent with that known in the fine structure of filaments and the magnetic field of limb prominences.