G. Vigeesh, V. Fedun, S. S. Hasan, R. Erdélyi
We present results of a three-dimensional numerical simulation of
magnetohydrodynamic wave propagation in a solar magnetic flux tube. Our study
aims at understanding the properties of various MHD wave modes generated by
different photospheric motions. We consider two scenarios observed in the solar
photosphere, namely, granular buffeting and vortex-like motion, among the
simplest mechanism for the generation of waves within a strong magnetic flux
concentration. We show that, granular buffeting is likely to produce stronger
slow and fast magneto-acoustic waves as compared to swirl motions.
Correspondingly, the energy flux transported differ as a result of this driving
motions. We also show that the waves generated by granular buffeting are likely
to produce stronger emission in the chromospheric network. We argue that
different mechanisms of wave generation are active during the evolution of a
magnetic element in the intergranular lane, resulting in temporally varying
emission at chromospheric heights.
View original:
http://arxiv.org/abs/1109.6471
No comments:
Post a Comment