Plasma diagnostic of a solar prominence from hydrogen and helium   resonance lines
  We present the first comparison of profiles of H et He resonance lines observed by SUMER with theoretical profiles computed with our non-LTE radiative transfer code. We use the H I Lyman-beta, H I Lyman-epsilon, and He I 584 A lines. Our code allows us to obtain the plasma parameters in prominences in conjunction with a multi-line, multi-element set of observations. The plasma temperature in the prominence core is ~ 8600 K and the pressure is 0.03 dyn/cm^2. The Ly-beta line is formed in a higher temperature region (more than 11000 K). 
N. Labrosse (1), J.-C. Vial (2), P. Gouttebroze (2) ((1) Institute of   Mathematical and Physical Sciences, University of Wa...