Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243..501t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 2, March 1991, p. 501-511.
Astronomy and Astrophysics
Astrophysics
37
H Alpha Line, Solar Limb, Solar Prominences, Chromosphere, Fourier Analysis, Magnetohydrodynamic Waves, Power Spectra, Velocity Distribution
Scientific paper
Center-to-limb observations of time sequences of the velocity field in filaments have been made with the MSDP spectrograph operating on the Meudon solar tower. The velocity power spectra made over whole filament regions show a broad maximum around 200 s period. The power in the filaments is reduced compared with the chromosphere power near the disk center by a factor of 2-4, while at nu = 0.9 they are more comparable. Nevertheless, the MSDP spectrograph allows a 2D analysis and it is found that high oscillation amplitudes are detected in discrete areas, principally at the edges of the filaments and in chromospheric fibrils close to the filament, with well defined periods around 250 s, 200 s, and 150 s. The oscillations are transverse to the direction of the fine structures. A wave propagation velocity along the fibrils has been derived from the observations and could correspond to an Alfven velocity.
Schmieder Brigitte
Thompson William T.
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