Mass motions in active region filaments |
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| Authors: | Hanaoka Yoichiro Kurokawa Hiroki |
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| Institution: | (1) Hida Observatory, Kyoto University, 506-13 Kamitakara, Gifu, Japan |
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| Abstract: | Mass motions in active region filaments of regions NOAA 4171 and McMath 16208 are analyzed. Both regions were continuously observed with the Zeiss Lyot filter for about a week at the Hida Observatory. As for NOAA 4171, Dopplergrams are made from the H filtergrams of 7 wavelengths for the qualitative study of the velocity fields in the filament, and Beckers' cloud model analysis is employed for a quantitative study of them. Dopplergrams of McMath 16208 are also constructed for qualitative analyses to determine whether the results derived from the analysis of NOAA 4171 are applicable to this region.The following results are obtained. Matter in the long-lived filaments, which lie along the magnetic neutral lines, flows generally horizontally and along the axes of the filaments. Since the matter in the filaments is considered to flow along the magnetic field, the magnetic fields in the filaments must be highly sheared. The same patterns of mass flow are found in the same filaments on successive days; some of them last for at least several days. Some filaments show long-lived symmetrical downflows to both of their ends in which the velocity is about 30 km s-1. Such flows are seen both in NOAA 4171 and McMath 16208. We show a morphological model of such flows.Contributions from the Kwasan and Hida Observatory, Kyoto University, No. 295. |
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