التفاصيل البيبلوغرافية
| العنوان: |
Magnetic swirls and associated fast magnetoacoustic kink waves in a solar chromospheric flux tube |
| المؤلفون: |
Murawski, K., Kayshap, P., Srivastava, A. K., Pascoe, D. J., Jelínek, P., Kuźma, B., Fedun, V. |
| سنة النشر: |
2017 |
| المجموعة: |
Astrophysics |
| مصطلحات موضوعية: |
Astrophysics - Solar and Stellar Astrophysics |
| الوصف: |
We perform numerical simulations of impulsively generated magnetic swirls in an isolated flux tube which is rooted in the solar photosphere. These swirls are triggered by an initial pulse in a horizontal component of the velocity. The initial pulse is launched either: (a) centrally, within the localized magnetic flux tube; or (b) off-central, in the ambient medium. The evolution and dynamics of the flux tube is described by three-dimensional, ideal magnetohydrodynamic equations. These equations are numerically solved to reveal that in case (a) dipole-like swirls associated with the fast magnetoacoustic kink and $m=1$ Alfv\'en waves are generated. In case (b), the fast magnetoacoustic kink and $m=0$ Alfv\'en modes are excited. In both these cases, the excited fast magnetoacoustic kink and Alfv\'en waves consist of similar flow pattern and magnetic shells are also generated with clockwise and counter-clockwise rotating plasma within them, which can be the proxy of dipole-shaped chromospheric swirls. The complex dynamics of vortices and wave perturbations reveals the channelling of sufficient amount of energy to fulfill energy losses in the chromosphere ($\sim$ 10$^{4}$ W m$^{-1}$) and in the corona ($\sim$ 10$^{2}$ W m$^{-1}$). Some of these numerical findings are reminiscent of signatures in recent observational data. |
| نوع الوثيقة: |
Working Paper |
| DOI: |
10.1093/mnras/stx2763 |
| URL الوصول: |
http://arxiv.org/abs/1710.08179 |
| رقم الانضمام: |
edsarx.1710.08179 |
| قاعدة البيانات: |
arXiv |