Japan Geoscience Union Meeting 2019

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[J] Poster

P (Space and Planetary Sciences ) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM19] Frontiers in the solar physics

Sun. May 26, 2019 1:45 PM - 3:15 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Shinsuke Imada(Institute for Space-Earth Environmental Research, Nagoya University), Takaaki Yokoyama(School of Science, University of Tokyo), Toshifumi Shimizu(Institute of Space and Astronautical Science, JAXA), Yukio Katsukawa(National Astronomical Observatory of Japan, National Institute of Natural Sciences)

[PEM19-P11] Observations of Photospheric Magnetic Structure below a Solar Dark Filament

*Takaaki Yokoyama1, Yukio Katsukawa2, Masumi Shimojo2 (1.School of Science, The University of Tokyo, 2.National Astronomical Observatory of Japan)

Keywords:Sun, filament, photosphere

The structure of the photospheric vector magnetic field below a dark filament on the Sun is studied using the observations of the Spectro-Polarimeter attached to the Solar Optical Telescope onboard Hinode. Special attention is paid to discriminate the two suggested models, a flux rope or a bent arcade. "Inverse-polarity'' orientation is possible below the filament in a flux rope, whereas "normal-polarity'' can appear in both models. We study a filament in active region NOAA 10930, which appeared on the solar disk during 2006 December. To know whether it is in the normal orientation or in the inverse one under 180-degree ambiguity of the transverse field, the center-to-limb variation is used for the solution under an assumption that the filament does not drastically change its magnetic structure during the passage. When the filament is near the east limb, we found that the line-of-site magnetic component below is positive, while it is negative near the west limb. This change of sign indicates that the horizontal photospheric field perpendicular to the polarity inversion line beneath the filament has an "inverse-polarity'', that is indicating a flux-rope structure of the filament supporting field.