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In this study we show how hydrogen and helium lines modelling can be used tomake a diagnostic of active and eruptive prominences. One motivation for thiswork is to identify the physical conditions during prominence activation anderuption. Hydrogen and helium lines are key in probing different parts of theprominence structure and inferring the plasma parameters. However, theinterpretation of observations, being either spectroscopic or obtained withimaging, is not straightforward. Their resonance lines are optically thick, andthe prominence plasma is out of local thermodynamic equilibrium due to thestrong incident radiation coming from the solar disk. In view of the shift ofthe incident radiation occurring when the prominence plasma flows radially, itis essential to take into account velocity fields in the prominence diagnostic.Therefore we need to investigate the effects of the radial motion of theprominence plasma on hydrogen and helium lines. The method that we use is theresolution of the radiative transfer problem in the hydrogen and helium linesout of local thermodynamic equilibrium. We study the variation of the computedintegrated intensities in H and He lines with the radial velocity of theprominence plasma. We can confirm that there exist suitable lines which can beused to make a diagnostic of the plasma in active and eruptive prominences inthe presence of velocity fields.

Diagnostics of active and eruptive prominences through hydrogen and helium lines modelling