Magnetoacoustic oscillations in spatially periodic solar coronal structures

This paper is concerned with the propagation properties of the magnetoacoustic wave across the magnetic field embedded in plasma whose density varies periodically along the propagation direction. Such spatial structures are arcades of solar post-flare coronal loops. The model problem of wave propagation along the arcade implies analyzing the dispersion properties of the Hill equation. Oscillations in the range of seconds are the response of the arcade to an impulsive disturbance.