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Exploring short period oscillations in filaments

Published online by Cambridge University Press:  01 September 2007

D. Y. Kolobov ,
N. I. Kobanov  and
S. A. Chupin
D. Y. Kolobov
Affiliation:
Institute of Solar-Terrestrial Physics, P.O. Box 291, 664033, Irkutsk, Russia email: [email protected]
N. I. Kobanov
Affiliation:
Institute of Solar-Terrestrial Physics, P.O. Box 291, 664033, Irkutsk, Russia email: [email protected]
S. A. Chupin
Affiliation:
Institute of Solar-Terrestrial Physics, P.O. Box 291, 664033, Irkutsk, Russia email: [email protected]
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Abstract

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The authors analyse sources of false Doppler velocity signals of high frequencies (10 mHz and higher) in observations of filaments. In ground-based observations, spectrograph noise and image shifting at the spectrograph entrance slit are the main causes of the false signal. It is shown that using differential methods and telluric lines as reference lines significantly reduces the influence of the first factor. Periodical image shifting along the spectrograph slit can be compensated for during data reduction. In some cases detected high-frequency oscillations appear to be real.

Keywords

Sun: filamentsSun: oscillationsSun: chromosphere
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S247: Waves & Oscillations in the Solar Atmosphere: Heating and Magneto-Seismology , September 2007 , pp. 178 - 181
Copyright
Copyright © International Astronomical Union 2008

References

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