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Modulation of gyrosynchrotron emission in solar and stellar flares by slow magnetoacoustic oscillations
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Nakariakov, V. M. (Valery M.) and Melnikov, V. F. (Victor Fedorovich) (2006) Modulation of gyrosynchrotron emission in solar and stellar flares by slow magnetoacoustic oscillations. Astronomy & Astrophysics, Vol.446 (No.3). pp. 1151-1156. doi:10.1051/0004-6361:20053944 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361:20053944
Abstract
Gyrosynchrotron emission generated by non-thermal electrons in solar and stellar coronal flares can be efficiently modulated by slow magnetoacoustic oscillations in the flaring loops. The modulation mechanism is based upon perturbation of the efficiency in the Razin suppression of optically thin gyrosynchrotron emission. Modulation of the emission is in anti-phase with the density perturbation in the slow wave. The observed emission modulation depth can be up to an order of magnitude higher than the slow wave amplitude. This effect is more pronounced at lower frequencies. Observations with spatial resolution, together with analysis of the modulation frequency, are shown to be sufficient for providing the information needed to identify the mode.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Solar flares, Sun -- Corona, Solar oscillations, Stellar oscillations, Stars -- Corona | ||||
| Journal or Publication Title: | Astronomy & Astrophysics | ||||
| Publisher: | EDP Sciences | ||||
| ISSN: | 0004-6361 | ||||
| Official Date: | February 2006 | ||||
| Dates: |
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| Volume: | Vol.446 | ||||
| Number: | No.3 | ||||
| Page Range: | pp. 1151-1156 | ||||
| DOI: | 10.1051/0004-6361:20053944 | ||||
| Status: | Peer Reviewed | ||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||
| Funder: | Royal Society (Great Britain), Engineering and Physical Sciences Research Council (EPSRC), Leverhulme Trust (LT), Rossiĭskiĭ fond fundamentalʹnykh issledovaniĭ [Russian Foundation for Basic Research] (RFBR) | ||||
| Grant number: | 04-02-39029 (RFFI), 04-02-16753 (RFFI), GR/R77940/1 (EPSRC) |
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