Multiple velocities observed in HeI 1083 nm

We present a time sequence of slit spectra of Hei 1083.03 nm (and H) taken with the German Vacuum Tower Telescope at Tenerife. We find the signature of an onset of a downflow accelerating up to 42 km/s . The Hei 1083.03 nm line splits into two well separated components during the event, one of which shows the usual absorption profile of material which is almost at rest. We calculate the velocity, line depth and area of both line profiles. Possible explanations for these observed multiple velocities are discussed.