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Measurement of velocity fields in prominence plasma with SUMER/CDS on SOHO

TitleMeasurement of velocity fields in prominence plasma with SUMER/CDS on SOHO
Publication TypeConference Paper
Year of Publication2002
AuthorsCirigliano, D., Vial J.-C., and Rovira M.
EditorWilson, A.
Conference NameFrom Solar Min to Max: Half a Solar Cycle with SOHO
Date PublishedJun
Abstract

Disk and quiescent prominence observations have been obtained with the CDS (Coronal Diagnostic Spectrograph) and SUMER (Solar Ultraviolet Measurement of Emitted Radiation) instruments, on board SOHO. The purpose is to investigate the macroscopic velocities of several species in the prominence plasma as compared to the quiet Sun velocities. To calculate the solar disk velocities we have taken into account the bi-modal distribution of UV structures in the quiet Sun. The macroscopic velocities in prominences were computed from the Doppler shifts in every line spectrum, taking those in the solar disk as reference. We have obtained absolute values for the macroscopic velocities ranging from 5 km/s to 40 km/s. We have also attempted to separate the central core vs. the external border behaviours of the macroscopic velocities.