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SUMER/SOHO Observations of Long Period Oscillations in an Active Region Filament

Published online by Cambridge University Press:  13 May 2016

S. Régnier
Affiliation:
Institut d'Astrophysique Spatiale, Unité Mixte CNRS-Université Paris XI, Bâtiment 121, F-91405 Orsay Cedex, France
J. Solomon
Affiliation:
Institut d'Astrophysique Spatiale, Unité Mixte CNRS-Université Paris XI, Bâtiment 121, F-91405 Orsay Cedex, France
J. C. Vial
Affiliation:
Institut d'Astrophysique Spatiale, Unité Mixte CNRS-Université Paris XI, Bâtiment 121, F-91405 Orsay Cedex, France

Abstract

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During the MEDOC campaign #4 (October 1999), we observed an active region filament with the SUMER/SoHO spectrometer using the 584.33 Å HeI line. After a description of the HeI line profile in the filament, we present a Fourier analysis of SUMER long time observations. This analysis allows to detect oscillations in several ranges of periodicities: 6–20 min, 40–90 min. We discuss these periodicities in terms of Alfvén and magnetoacoustic waves obtained with a filament model developed by Joarder & Roberts (1993).

Type
Session III: Active Region Structure and Dynamics
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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