JOP131 SPECTRO-POLARIMETRIC DIAGNOSTICS OF PROMINENCES AND FILAMENTS WITH SOHO AND THEMIS Received: 28 April 2001 Schmieder B., Heinzel P., Malherbe J.M., Vial J.C., Roudier T., Aulanier G. For MEDOC#10 EIT will join this JOP date: between the 14 may to 20 May 2001 (7 days between 8:00-12:00 UT with the slit of SUMER crosses the disk at 800 or less) Abstract: ' Observations of prominences and filaments by SUMER in Lyman lines and continuum and by THEMIS (MTR polarimetric) in Balmer, Iron , He and Calcium IR lines. Modelization of the interface between the prominence and the corona using non LTE radiative tranfer code MALI ' Aim of the study: We would like to get new observations of prominences filaments by SUMER in Lyman lines and continuum. First results (Schmieder et al. 1998, Schmieder et al. 1999 and Heinzel et al. 2001) are very interesting and encouraging for new kind of 2D-transfer modelling and PCTR-diagnostics (Heinzel and Anzer 2001). We can also somewhat modify the observational sequencies in order to meet better the theoretical constrains (mainly the spatial resolution). It seems that Lyman line series observations can give us informations on the prominence-corona transition region (PCTR), its thickness and its temperature gradients. With such a study it seems possible to determine the mutual relation between the magnetic field configuration of the prominence and its PCTR. Also we could answer basic questions concerning the location of the cool material inside a dipped magnetic field lines. If the observations are done on the disk, extrapolations of the photospheric magnetic field could be achieved and be a test to the Heinzel and Anzer conclusions of the dip existence. Another interesting study is a comparison of the absorption of the coronal-line emissions (TRACE, CDS) by the Lyman continuum of H and by He resonance continua with theoretical model predictions (the work is currently in progress). If we know the Lyman continuum emission from SUMER and H-alpha plus other lines from severe intruments (SUMER, CDS, TRACE, GBO's), we can impose realistic constraints on the non-LTE radiative tranfer models and obtain a more accurate solutions for the physical parameters of prominences and filaments. We also plan to study pre-eruptive stages of prominences/filaments if appropriate targets are available (or even eruptive phases). This is very important to understand the onset of CME's. SOHO intruments: SUMER, CDS Space intstruments: TRACE About GBO: THEMIS in TMR mode with full Stokes polarimetry (I,Q,U,V) would scan the filament/prominence in several lines: H-alpha (6563) and H-beta (4861) of H I, Ca II (8542, and in a second priority 8498) He I D3 5876 (The D3 line is suitable particularly for the prominence). Fe I 6301, 6302 (for the photospheric magnetic field measurement below the filament or eventually Fe I 8688) It will be the first time that a high resolution multiline slit spectro-polarimetry is made with THEMIS for prominences/filaments, simultaneously with UV spectra from space. Othe GBO instruments will join the campaign: Pic du Midi (MSDP Halpha), Bialkow (Wroclaw), Ondrejov Observatory. References: Aulanier G.,Dermoulin P., 1998, A et A. Schmieder B., Heinzel P., Kucera T., Vial J.C. Flament Observations with SOHO SUMER/CDS: The behaviour of Lyman Lines 1998, Solar Physics, 181, 309 Schmieder B., Heinzel P., Vial J.C., Rudawy P. Lyman lines as good spectral diagnostics of prominence-corona transition region 1999, Solar Physics, 189, 109 Heinzel P., Schmieder B., Vial J.C., Kotrc P.: SOHO/SUMER observations of the hydrogen Lyman spectrum in solar prominences 2001, A and A, in press Heinzel P. and Anzer U.: 2D magnetic support in prominences, 2001, ApJ. in preparation Possible observers: THEMIS: Malherbe (Rudawy, Kotrc ?) MEDOC Heinzel (Vial)