Alfven gravity waves in viscous solar plasma: Effect of the background flow

We study the Propagation and damping properties of Alfven gravity waves in the presence of the vertical magnetic field in the viscous solar plasma under influence of the background flow by deriving a fourth order dispersion relation in terms of the Doppler shifted frequency. We derive the dispersion relation under WKB and Boussinesq approximation. We study the damping of Alfven gravity waves for the wave frequencies less than and greater than the Brunt-VaisaIa frequency. We find that the Brunt-Vaisala frequency divides the frequency ranges where the weakly or strongly damped oscillations occur. The background flow exhibits a strong effect on weakly damped oscillations and a weak effect on the strongly damped oscillations. We also notice that the damping of both the strong and weakly damped oscillations depend on the Brunt-Viiisalii frequency and wave number. The effect of the background flow is also being governed by the Brunt-Vaisai frequency and wave number. We also study the properties of gravity wave mode after filtering the Alfven wave mode by minimizing the magnetic field and noticed that the background flow shows a very strong effect on the gravity wave mode. (C) 2018 COSPAR. Published by Elsevier Ltd. All rights reserved.