Numerical Simulations of Two-Fluid Magnetoacoustic Waves in the Solar Atmosphere by J. Kraśkiewicz et al. on Wednesday 30 November

We study vertical variations of wave-periods of magnetoacoustic two-fluid

waves in the partially ionized lower solar atmosphere, consisting of ion

(proton) + electron and neutral (atomic hydrogen) fluids, which are coupled by

ion-neutral collisions. The study allows finding the wave period cutoffs and

their variations in the solar atmosphere, as well as establishing the role of

these cutoffs in determining the wave propagation conditions. The atmosphere is

permitted by a uniform vertical magnetic field. We perform numerical

simulations in the framework of a one-dimensional (1D), two-fluid model in

which plane waves are exited by a harmonic driver in the vertical ion and

neutral velocities, operating at the bottom of the solar photosphere. We

observe excitation of waves with cutoff wave-periods in addition to waves set

directly by the driver. We also see that some waves exited by that driver can

reach the solar corona. Despite of its limitations such as the lack of

non-adiabatic and non-ideal terms and a simple 1D structure, the developed

two-fluid model of the solar atmosphere sheds a new light on the role of

cutoffs in setting up the wave propagation conditions in the solar atmosphere

and finding periods of waves that may carry their energy from the solar surface

to the corona.

arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.16463v1