PROMINENCE PARAMETERS DERIVED FROM MAGNETIC-FIELD MEASUREMENTS AND NLTE DIAGNOSTICS

In this paper we present a detailed analysis of a number of quiescent prominences for which the components of the magnetic field as well as the electron density and emission measure were previously obtained fro m quasi-simultaneous measurements in hydrogen Her and helium D-3 lines . From magnetic equilibrium models of the Kippenhahn-Schluter type one can calculate the gas pressure, density, column mass and geometrical width. The same set of physical parameters can also be derived from a NLTE hydrogen-line analysis. We have studied the mutual correlations b etween these two sets of parameters. Very large differences, reaching an order of magnitude, were found between these two sets, both for ind ividual prominences and for the mean values over all prominences used in this investigation. Finally, we discuss some implications of our re sults.