The document discusses plasma diagnostic observations of eruptive solar prominences from SDO/AIA at 304 Angstroms. New non-LTE radiative transfer calculations allow plasma parameters like temperature, column mass, and radial velocity to vary, unlike previous models. The observations and new models show that the Helium II 304 Angstrom line intensity can either decrease or increase with increasing radial velocity, depending on changes in the plasma parameters. Allowing parameters to vary produces a range of intensities that matches the range seen in SDO/AIA observations qualitatively.