日本地球惑星科学連合2019年大会

講演情報

[J] ポスター発表

セッション記号 P (宇宙惑星科学) » P-EM 太陽地球系科学・宇宙電磁気学・宇宙環境

[P-EM19] 太陽物理学の最前線

2019年5月26日(日) 13:45 〜 15:15 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:今田 晋亮(名古屋大学宇宙地球環境研究所)、横山 央明(東京大学大学院理学系研究科)、清水 敏文(宇宙航空研究開発機構宇宙科学研究所)、勝川 行雄(自然科学研究機構国立天文台)

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

*横山 央明1勝川 行雄2下条 圭美2 (1.東京大学大学院理学系研究科、2.国立天文台)

キーワード:太陽、フィラメント、光球

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.