Periodic and quasiperiodic Doppler velocity variations in solar prominences along one spatial direction

Details Periodic and quasiperiodic Doppler velocity variations in solar prominences along one spatial direction Periodic and quasiperiodic Doppler velocity variations in solar prominences along one spatial direction

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...204..286b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 204, no. 1-2, Oct. 1988, p. 286-300.

Astronomy and Astrophysics

Astrophysics

34

Doppler Effect, Solar Prominences, H Alpha Line, Periodic Variations, Power Spectra, Solar Oscillations, Solar Spectra, Spatial Distribution

Scientific paper

Temporal variations of the Doppler displacement of the Hα-emission line were measured in four quiescent prominences in autumn 1986 at the recently installed Gregory telescope on Tenerife. As detector, a 100×100 pixel diode array was used. The length of the time series was up to seven hours. The slit was oriented parallel to the solar limb in the first case and perpendicular in the others. In November 1987 another prominence was observed with a 256×256 pixel camera simultaneously in Ca+H and Hɛ over five hours. In this case, the slit was oriented parallel to the solar limb. The result for the two lines are in good agreement. The authors earlier result of periods near one hour is confirmed. Short periods near five and three minutes are found in some parts of the prominences. They might be interpreted as a reaction of the prominence on the photospheric and chromospheric oscillations. For the time series of more than five hours indications of eigenmodes of the prominences are found.

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