Frequency dependence of resonant absorption and over-reflection of magnetosonic waves in nonuniform structures with shear mass flow

Processes of resonant absorption and over-reflection of magnetosonic modes may occur in nonuniform plasmas with a shear mass flow along the magnetic f ield. In this work, we study how these two phenomena depend on the frequenc y omega of waves propagating in a given direction prescribed by polar angle s theta and phi of wave vector k. Plasma is assumed nonuniform within a tra nsitional layer that separates two semi-infinite uniform regions. The consi dered wave propagates only in one of the two regions and is reflected from the nonuniform transitional layer either totally or partially depending on the efficiency of resonant processes. The resonant absorption and over-reflection are strongly dependent on wave frequency for both the slow and fast magnetosonic mode as shown in correspo nding figures. Under conditions relevant to the solar atmosphere, we found that typical MH D waves with periods from few seconds up to much larger values of several m inutes and more, can be resonantly absorbed and also over-reflected. This i mportant fact has to be taken into account in making models of energy trans ports in the corona.