Bilal Ramzan (Institute of Astronomy, National Central University, Zhongli Dist.,Taoyuan City, Taiwan (R.O.C.)D.O. Chernyshov (I.E.Tamm Theoretical Physics Division of P.N.Lebedev Institute of Physics, Leninskii pr. 53, 119991 Moscow, Russia)Chung-Ming Ko (Institute of Astronomy, National Central University, Zhongli Dist.,Taoyuan City, Taiwan (R.O.C.)
Cosmic rays are highly charged particles co-exist with interstellar matter in our Galaxy. The energy densities of cosmic rays, thermal gas and magnetic field are comparable. Cosmic rays interact with magnetized thermal plasma via hydromagnetic waves. They exert pressure on the plasma and excite waves by streaming instability. The dissipation of wave may heat the plasma. We model the system as a multi-fluid system which consists of thermal plasma, cosmic rays and two opposite propagated Alfven waves. We examine the effect of cosmic rays and waves on the structure and properties of interstellar clouds.