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Flare-generated acoustic oscillations in solar and stellar coronal loops
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Tsiklauri, D., Nakariakov, Valery M., Arber, T. D. and Aschwanden, Markus J.. (2004) Flare-generated acoustic oscillations in solar and stellar coronal loops. Astronomy & Astrophysics, Vol.422 (No.1). pp. 351-355. ISSN 0004-6361
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Official URL: http://dx.doi.org/10.1051/0004-6361:20040299
Abstract
Long period longitudinal oscillations of a flaring coronal loop are studied numerically. In the recent work of Nakariakov et al. (2004) it has been shown that the time dependence of density and velocity in a flaring loop contain pronounced quasi-harmonic oscillations associated with the 2nd harmonic of a standing slow magnetoacoustic wave. In this work we investigate the physical nature of these oscillations in greater detail, namely, their spectrum (using the periodogram technique) and how heat positioning affects mode excitation. We found that excitation of such oscillations is practically independent of the location of the heat deposition in the loop. Because of the change of the background temperature and density, the phase shift between the density and velocity perturbations is not exactly a quarter of the period; it varies along the loop and is time dependent, especially in the case of one footpoint (asymmetric) heating.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QB Astronomy |
| Divisions: | Faculty of Science > Physics |
| Library of Congress Subject Headings (LCSH): | Solar flares, Stellar oscillations, Sun -- Corona, Stars -- Corona |
| Journal or Publication Title: | Astronomy & Astrophysics |
| Publisher: | EDP Sciences |
| ISSN: | 0004-6361 |
| Date: | July 2004 |
| Volume: | Vol.422 |
| Number: | No.1 |
| Page Range: | pp. 351-355 |
| Identification Number: | 10.1051/0004-6361:20040299 |
| Status: | Peer Reviewed |
| Access rights to Published version: | Open Access |
| Funder: | Particle Physics and Astronomy Research Council (Great Britain) (PPARC), Nuffield Foundation (NF) |
| Grant number: | NUF-NAL 04 (Nuffield) |
| References: | Arber, T. D., Longbottom, A.W., Gerrard, C. L.,&Milne, A. M. 2001, J. Comput. Phys., 171, 151 Aschwanden, M. J. 1987, Sol. Phys., 111, 113 Aschwanden, M. J., & Alexander, D. 2001, Sol. Phys., 204, 93 Aschwanden, M. J., Brown, J. C., & Kontar, E. P. 2002, Sol. Phys., 210, 383 Mathioudakis, M., Seiradakis, J. H., Williams, D. R., et al. 2003, A&A, 403, 1101 McKenzie, D. E., & Mullan, D. J. 1997, Sol. Phys., 176, 127 Nakariakov, V. M., Tsiklauri, D., Kelly, A., Arber, T. D., & Aschwanden, M. J. 2004, A&A, 414, L25 Ofman, L., Nakariakov, V. M., & DeForest, C. E. 1999, ApJ, 514, 441 Ofman, L., & Wang, T. J. 2002, ApJ, 580, L85 Peres, G., Rosner, R., Serio, S., & Vaiana, G. S. 1982, ApJ, 252, 791 Priest, E. R. 1982, Solar Magnetohydrodynamics (Holland, Dordrecht: D. Reidel Publ. Comp.) Rosner, R., Tucker, W. H., & Vaiana, G. S. 1978, ApJ, 220, 643 Scargle, J. 1982, ApJ, 263, 835 Terekhov, O. V., Shevchenko, A. V., Kuz’min, A. G., et al. 2002, Astron. Lett., 28, 397 Tsiklauri, D., Aschwanden, M. J., Nakariakov, V. M., & Arber, T. D. 2004, A&A, 419, 1149 Wang, T., Solanki, S. K., Curdt, W., Innes, D. E., & Dammasch, I. E. 2002, ApJ, 574, L101 Wang, M., & Xie, R. X. 2000, Chin. Astron. Astrophys., 24, 95 Zaitsev, V. V., & Stepanov, A. V. 1989, SvA Lett., 15, 66 |
| URI: | http://wrap.warwick.ac.uk/id/eprint/3599 |
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