Recent theoretical results on coronal heating

被引:34
作者
Gomez, DO
Dmitruk, PA
Milano, LJ
机构
[1] Univ Buenos Aires, Dept Phys, RA-1428 Buenos Aires, DF, Argentina
[2] Natl Solar Observ, Sunspot, NM 88349 USA
[3] Inst Astron & Fis Espacio, RA-1428 Buenos Aires, DF, Argentina
关键词
D O I
10.1023/A:1005283923956
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The scenario of magnetohydrodynamic turbulence in connection with coronal active regions has been actively investigated in recent years. According to this viewpoint, a turbulent regime is driven by footpoint motions and the incoming energy is efficiently transferred to small scales due to a direct energy cascade. The development of fine scales to enhance the dissipation of either waves or DC currents is therefore a natural outcome of turbulent models. Numerical integrations of the reduced magnetohydrodynamic equations are performed to simulate the dynamics of coronal loops driven at their bases by footpoint motions. These simulations show that a stationary turbulent regime is reached after a few photospheric times, displaying a broadband power spectrum and a dissipation rate consistent with the energy loss rates of the plasma confined in these loops. Also, the functional dependence of the stationary heating rate with the physical parameters of the problem is obtained, which might be useful for an observational test of this theoretical framework.
引用
收藏
页码:299 / 318
页数:20
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