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Abstrakty
We study by numerical means the MHD oscillations in a solar coronal loop. Obtained numerical results show that impulses, which are launched in the ambient plasma, excite oscillations in mass density profiles that reveal asymmetry in a cross-section of the loop. This asymmetry is a consequence of the fact that while a part of the loop is compressed its other part is rarefied, resulting from transverse loop oscillations. Due to a lack of spatial resolution this feature has not been observed in the earlier numerical studies of impulsively generated waves. The numerical simulations reveal distinctive time-signatures which are collected at a detection point inside the loop. For the chosen set of physical parameters, these signatures reveal a dozen or so seconds oscillations in the mass density. These oscillations are usually more complex further out from the trigger. A sufficiently large slow magnetosonic wave generates shocks which temporal evolution we trace in mass density profiles.
Słowa kluczowe
Czasopismo
Rocznik
Tom
Strony
211--220
Opis fizyczny
Bibliogr. 18 poz., rys., wykr., zdj.
Twórcy
autor
- Institute of Physics, UMCS, ul. Radziszewskiego 10, 20-031 Lublin, Poland
autor
- Institute of Physics, UMCS, ul. Radziszewskiego 10, 20-031 Lublin, Poland
Bibliografia
- Aschwanden, M. 2003, Proc. NATO Workshop, Budapest, 0309505.
- Fryxell, B., et al. 2000, Astrophys. J. Suppl. Ser., 131, 273.
- Godunov, S.K. 1959, Mat. Sb., 47, 271.
- LeVeque, R.J. 2002, “Finite-volume methods for hyperbolicproblems”, Cambridge.
- Murawski, K. 2002, “Analytical and numerical methods for wave propagation in fluids”, World Scientific, Singapore.
- Murawski, K., and Roberts, B. 1993, Solar Phys, 144, 255.
- Murawski, K., and Roberts, B. 1994, Solar Phys., 151, 305.
- Murawski, K., Aschwanden, M., and Smith, J. 1998, Solar Phys., 179, 313.
- Nakariakov, V.M. 2003, in: “The Dynamic Sun”, Ed. B. Dwivedi, CUP, 3,4.
- Nakariakov, V.M., and Ofman, L. 2001, Astron. Astrophys., 372, L53.
- Nakariakov, V.M., Tsiklauri, D., Kelly, A., Arber, T.D., and Aschwanden, M. J. 2004, MNRAS, in press.
- Porter, L.J., Klimchuk, J.A., and Sturrock, P.A. 1994, Astrophys. J., 435, 482.
- Powell, K. 1999, J. Comp. Phys., 154, 284.
- Priest, E.R. 1982, “Solar magnetohydrodynamics”, D. Reidel Publ. Comp., Dardrecht, Holland.
- Roberts, B. 2000, Solar Phys., 193, 139.
- Roberts, B., Edwin, P.M., and Benz, A.O. 1984, Astrophys. J., 279, 857.
- Rudawy, P., et al. 2004, Astron. Astrophys., 416, 1179.
- Schrijver, C.J., et al. 1999, Solar Phys., 187, 261.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-eab62b82-c15d-4168-b51c-a0462f7669c2