The Hβ Chromospheric Magnetic Field in a Quiescent Filament

We observed the line-of-sight magnetic field in the chromosphereand photosphere of a large quiescent filament on the solar disk on September 6, 2001 using the Solar Magnetic Field Telescope in Huairou Solar Observing Station. The chromospheric and photospheric magnetograms together with Hβ filtergrams of the filament were examined. The filament was located on the neutral line of the large scale longitudinal magnetic field in the photosphere and the chromosphere. The lateral feet of the filament were found to be related to magnetic structures with opposite polarities. Two small lateral feet are linked to weak parasitic polarity. There is a negative magnetic structure in the photosphere under a break of the filament. At the location corresponding to the filament in the chromospheric magnetograms, the magnetic strength is found to be about 40-70 Gauss (measuring error about 39 Gauss). The magnetic signal indicates the amplitude and orientation of the internal magnetic field in the filament. We discuss several possible causes which may produce such a measured signal. A twisted magnetic configuration inside the filament is suggested .

The Hβ Chromospheric Magnetic Field in a Quiescent Filament

We observed the line-of-sight magnetic field in the chromosphereandphotosphere of a large quiescent filament on the solar disk on September 6, 2001using the Solar Magnetic Field Telescope in Huairou Solar Observing Station. Thechromospheric and photospheric magnetograms together with Hβ filtergrams of thefilament were examined. The filament was located on the neutral line of the largescale longitudinal magnetic field in the photosphere and the chromosphere. Thelateral feet of the filament .were found to be related to magnetic structures with op-posite polarities. Two small lateral feet are linked to weak parasitic polarity. Thereis a negative magnetic structure in the photosphere under a break of the filament.At the location corresponding to the filament in the chromospheric magnetograms,the magnetic strength is found to be about 40-70 Gauss (measuring error about 39Gauss). The magnetic signal indicates the amplitude and orientation of the internalmagnetic field in the filament. We discuss several possible causes which may pro-duce such a measured signal. A twisted magnetic configuration inside the filamentis suggested .