Seminar talk by Eberhard Wiehr

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Title: The velocity excess of ions over neutrals in solar prominences

by Eberhard Wiehr (Institut für Astrophysik, Göttingen, Germany)

Time varying Doppler shifts of NaD and SrII in a quiescent prominence are coherent in phase but show 15% larger amplitude of the ions. This is equally found for HeI 5015 and FeII 5018 and suggests a drag effect between neutrals and ions, when moved by the magnetic field. The non-thermal velocities, responsible for the SrII broadening are not related to its Doppler shifts.