  We examine the scattering of acoustic p-mode waves from a thin magnetic
fibril embedded in a gravitationally stratified atmosphere. The scattering is
mediated through the excitation of slow sausage waves on the magnetic tube, and
only the scattering of the monopole component of the wavefield is considered.
Since such tube waves are not confined by the acoustic cavity and may freely
propagate along the field lines removing energy from the acoustic wavefield,
the excitation of fibril oscillations is a source of acoustic wave absorption
as well as scattering. We compute the mode mixing that is achieved and the
absorption coefficients and phase shifts. We find that for thin tubes the mode
mixing is weak and the absorption coefficient is small and is a smooth function
of frequency over the physically relevant band of observed frequencies. The
prominent absorption resonances seen in previous studies of unstratified tubes
are absent. Despite the relatively small absorption, the phase shift induced
can be surprisingly large, reaching values as high as 15 degree for f modes.
Further, the phase shift can be positive or negative depending on the incident
mode order and the frequency.
