Transverse oscillations of a double-structured solar filament

0534078 - ASÚ 2021 RIV FR eng J - Článek v odborném periodiku
Jelínek, P. - Karlický, Marian - Smirnova, V.V. - Solov'ev, A.A.
Transverse oscillations of a double-structured solar filament.
Astronomy & Astrophysics. Roč. 637, May (2020), č. článku A42. ISSN 0004-6361. E-ISSN 1432-0746
Grant CEP: GA ČR(CZ) GA18-09072S; GA ČR(CZ) GA19-09489S; GA ČR(CZ) GC20-09922J
Institucionální podpora: RVO:67985815
Klíčová slova: Sun * filaments * prominences
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.803, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.1051/0004-6361/201936836

We study the transverse oscillations of a double-structured solar filament.Methods. We modelled the filament numerically via a 2D magnetohydrodynamic (MHD) model, in which we solved a full set of time-dependent MHD equations by means of the FLASH code, using the adaptive mesh refinement method. We used the wavelet analysis method as a diagnostic tool for analysing periods in simulated oscillations. We present a model of a solar filament combined with semi-empirical C7 model of the quiet solar atmosphere. This model is an alternative model of a filament based on the magnetostatic solution of MHD equations. We find that this double-structured filament oscillates with two different eigen frequencies. The ratio is approximately 1.75 (similar to 7.4 min/similar to 4.2 min), which is characteristic for this type of filament model. To show the details of these oscillations we present a time evolution of the plasma density, temperature, plasma beta parameter, and the ratio of gravity to magnetic pressure taken along the vertical axis of the filament at x=0. The periods found by numerical simulations are then discussed in comparison with those observed.
Trvalý link: http://hdl.handle.net/11104/0312298