EDP Sciences
Free access
Volume 412, Number 1, December II 2003
Page(s) 267 - 270
Section Diffuse matter in space
DOI http://dx.doi.org/10.1051/0004-6361:20034115

A&A 412, 267-270 (2003)
DOI: 10.1051/0004-6361:20034115

Spectro-polarimetric observation of the fine structure of a quiescent filament

W. G. Zong1, Y. H. Tang1, C. Fang1, P. Mein2, N. Mein2 and A. A. Xu1

1  Department of Astronomy, Nanjing University, 210093, Nanjing, PR China
2  Observatoire de Paris, Section de Meudon, 92195, Meudon, France

(Received 24 July 2003 / Accepted 21 August 2003)

This paper presents the spectro-polarimetric measurements of a big quiescent filament observed by the MSDP mode of the THEMIS on August 24, 2000. The H $\alpha$, CaII 8542 and NaI D2 line profiles of a segment of the filament were obtained. By use of the H $\alpha$ images with high spatial resolution, the two barb endpoints were identified. The parameters at the barbs' endpoints, including intensity, velocity and longitudinal magnetic field were measured. Using the data with high spatial resolution (0.16 '' per pixel), we have found the following results. 1) There was mass motion at the barb endpoints in the chromosphere, the values and the directions of the mass motion at the barb endpoints change in several minutes. 2) The two barb endpoints are located between the majority polarities and the minority polarities.

Key words: line: profiles -- Sun: filaments -- Sun: magnetic fields

Offprint request: Y. H. Tang, yhtang@nju.edu.cn

© ESO 2003