Alfven Wave Conversion and Reflection in the Solar Chromosphere and Transition Region

Series solutions are used to explore the mode conversion of slow, Alfven and fast magnetohydrodynamic waves injected at the base of a two-isothermal-layer stratified atmosphere with a uniform magnetic field, crudely representing the solar chromosphere and corona with intervening discontinuous transition region. This sets a baseline for understanding the ubiquitous Alfvenic waves observed in the corona, which are implicated in coronal heating and solar wind acceleration. It is found that all three injected wave types can partially transmit as coronal Alfven waves in varying proportions dependent on frequency, magnetic field inclination, wave orientation, and distance between the Alfven/acoustic equipartition level and the transition region. However, net Alfvenic transmission is limited for plausible parameters, and additional magnetic field structuring may be required to provide sufficient wave energy flux.