Damping of Slow Magnetoacoustic Waves in an Inhomogeneous Coronal Plasma

Journal of astrophysics and astronomy

Nagendra Kumar¹  Anil Kumar¹  Pradeep Kumar1 2¹  Shiv Singh² 

[1] Department of Mathematics, K.G.K. (P.G.) College, Moradabad 244 001, Uttar Pradesh, India.$$;Department of Physics, Hindu College, Moradabad 244 001, Uttar Pradesh, India.$$

关键词: Sun: corona;    active region;    coronal loops;    TRACE;    MHD waves;    heating.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

We study the propagation and dissipation of slow magnetoacoustic waves in an inhomogeneous viscous coronal loop plasma permeated by uniform magnetic field. Only viscosity and thermal conductivity are taken into account as dissipative processes in the coronal loop. The damping length of slow-mode waves exhibit varying behaviour depending upon the physical parameters of the loop in an active region AR8270 observed by TRACE. The wave energy flux associated with slow magnetoacoustic waves turns out to be of the order of 106 erg cm-2 s-1 which is high enough to replace the energy lost through optically thin coronal emission and the thermal conduction belowto the transition region. It is also found that only those slow-mode waves which have periods more than 240 s provide the required heating rate to balance the energy losses in the solar corona. Our calculated wave periods for slow-mode waves nearly match with the oscillation periods of loop observed by TRACE.

【 授权许可】

Unknown