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Nikolai Kobanov   Submitted: 2008-02-07 05:27

We present the results of investigations into chromospheric velocity oscillations in sunspots, carried out at the Sayan Solar Observatory. It is shown that the "chevron" structures in the halftone diagrams demonstrate wavetrain properties. Such structures are indicators of a propagating wave process and they are typical of many sunspots. In the authors? opinion, three-minute umbral oscillations are not the source of running penumbral waves (RPW). It is very likely that umbral oscillations and RPW initially propagate along different magnetic field lines. We explain the decrease in RPW propagation velocity and frequency in the outer penumbra, as compared with the inner, by the combined action of different frequency modes. To better reveal the properties of these modes frequency filtering was used. Our measurements of the RPW (five-minute mode) wavelength and RPW propagation velocity in different sunspots vary from 12'' to 30'' and from 28 to 60 ? 70 km s-1 correspondingly.

Authors: N. I. Kobanov, D. Y. Kolobov and D. V. Makarchik
Projects: None

Publication Status: Solar Physics, 2006, V.238, 231-244
Last Modified: 2008-02-07 07:47
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