Doppler-velocity Drifts Detected in a Solar Prominence

Abstract We analyzed multiline observations of a quiescent prominence from the slit spectrograph located at Ondřejov Observatory. Dopplergrams and integrated intensity maps whole were obtained in six spectral lines: Ca ii H, H ϵ , β He i D3, α IR. By combining with non-LTE radiative-transfer modeling, we carefully identified areas an optically thin regime. The comparison Doppler-velocity scatterplots different lines shows existence differences velocity ions neutrals called drift. drift is local nature, present mostly edges area large gradient, as can be tentatively expected based on multifluid MHD models. could not explore time evolution drift, since our data set consists single scan only. Our paper brings another contribution to rather controversial problem detection effects solar prominences.