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Height distribution of the power of 3-min oscillations over sunspots
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Kobanov, N. I., Kolobov, D. Y., Chupin, S. A. and Nakariakov, Valery M.. (2011) Height distribution of the power of 3-min oscillations over sunspots. Astronomy & Astrophysics, Vol.525 . Article no. A41. ISSN 0004-6361
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Official URL: http://dx.doi.org/10.1051/0004-6361/200913533
Abstract
Context. The height structure of 3-min oscillations over sunspots is studied in the context of the recently discovered effect of height inversion: over the umbra, the spatial location of the maximum of chromospheric 3-min oscillation power corresponds to the relative decrease in the power of photospheric oscillations. Aims. We investigate whether the height inversion of the power of 3-min oscillations is a common feature of the spatial structure of the oscillations for the majority of sunspots. Methods. Spectrogram sequences of Ha 6563 angstrom and Fe I 6569 angstrom over sunspots, acquired with very high cadency (about 2 s or better) are obtained. The distribution of the oscillation power of the line-of-sight velocity signal is studied by using methods of wavelet frequency filtration and Fourier analysis. Results. The effect of the height inversion is found in 9 of 11 analyzed active regions. The interpretation of this effect is possibly connected to both the decrease in the level of photosphere in sunspot umbrae and the magnetic field topology.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QB Astronomy |
| Divisions: | Faculty of Science > Physics |
| Journal or Publication Title: | Astronomy & Astrophysics |
| Publisher: | EDP Sciences |
| ISSN: | 0004-6361 |
| Date: | January 2011 |
| Volume: | Vol.525 |
| Number of Pages: | 5 |
| Page Range: | Article no. A41 |
| Identification Number: | 10.1051/0004-6361/200913533 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| Funder: | Royal Society (Great Britain), Federal Agency for Science and Innovation |
| Grant number: | 10-02-00153-a (Royal Society) ; 02.740.11.0576, RFBR 08-02-91860-KO_a (Federal Agency for Science and Innovation) |
| URI: | http://wrap.warwick.ac.uk/id/eprint/4598 |
Data sourced from Thomson Reuters' Web of Knowledge
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