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Long period oscillations in sunspots
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Chorley, N., Hnat , B., Nakariakov, V. M. (Valery M.), Inglis, Andrew R. and Bakunina, I. A. (2010) Long period oscillations in sunspots. Astronomy & Astrophysics, Vol.513 (No.A27). doi:10.1051/0004-6361/200913683 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361/200913683
Abstract
Long period oscillations of the gyroresonant emission from sunspot atmospheres are studied. Time series data generated from the sequences of images obtained by the Nobeyama Radioheliograph operating at a frequency of 17 GHz for three sunspots have been analysed and are found to contain significant periods in the range of several tens of minutes.Wavelet analysis shows that these periods
are persistent throughout the observation periods. The presence of the oscillations is confirmed by several methods (periodogram, wavelets, Fisher randomisation and empirical mode decomposition). Spatial analysis using the techniques of period, power, correlation and time lag mapping reveals regions of enhanced oscillatory power in the umbral regions. Also seen are two regions of coherent
oscillation of about 25 pixels in size, that oscillate in anti-phase with each other. Possible interpretation of the observed periodicities is discussed, in terms of the shallow sunspot model and the leakage of the solar g-modes.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Sunspots, Solar oscillations | ||||
| Journal or Publication Title: | Astronomy & Astrophysics | ||||
| Publisher: | EDP Sciences | ||||
| ISSN: | 0004-6361 | ||||
| Official Date: | April 2010 | ||||
| Dates: |
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| Volume: | Vol.513 | ||||
| Number: | No.A27 | ||||
| DOI: | 10.1051/0004-6361/200913683 | ||||
| Status: | Peer Reviewed | ||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||
| Funder: | Royal Society (Great Britain), Engineering and Physical Sciences Research Council (EPSRC), Shibasaki, K. (Kiyoto) |
Data sourced from Thomson Reuters' Web of Knowledge
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