Fine Structure of Prominences and Filaments

The fine structures of prominences and filaments are involved in many phenomena such as formation and magnetostatic support, instabilities and eruptions. After a short introduction (Section 1), we concentrate on quiescent prominences, and we review some recent results about resolved structures (Section 2), statistical properties of “threads” (Section 3), and detailed analysis of average line profiles (Section 4). We mention magnetic field measurements (Section 5) and thermal problems (Section 6). New magnetostatic models (Section 7) are very promising. We discuss briefly the problem of the scale of fine structures, and we suggest some directions for further works (Section 8).