Damping and the period ratio P_1/2P_2 of non-adiabatic slow mode

摘要

We investigate the combined effects of thermal conduction, compressive viscosity and optically thin radiative losses on the period ratio, P_1/2P_2, (P_1 is the period of the fundamental mode and P_2 is the period of its first harmonic) of a slow mode propagating one dimensionally. We obtain the dispersion relation and solve it to study the influence of non-ideal effects on the period ratio. The dependence of period ratio on thermal conductivity, compressive viscosity and radiative losses has been shown graphically. It is found that the effect of thermal conduction on the period ratio is negligible while compressive viscosity and radiation have sufficient effects for small loops and large loops respectively.