Propagation of nonadiabatic magnetoacoustic waves in a threaded prominence with mass flows

TL;DR

This study examines how mass flows influence collective nonadiabatic magnetoacoustic waves in solar prominence threads, revealing that synchronized wave modes depend on specific flow velocities and plasma conditions.

Contribution

It introduces a detailed model of prominence threads with mass flows and analyzes their impact on collective wave modes using T-matrix acoustic scattering theory.

Findings

Wave modes with collective dynamics require similar Doppler-shifted frequencies.

Synchronization of waves depends on specific plasma and flow parameters.

Flow velocities critically influence the existence of collective oscillations.

Abstract

High resolution observations of solar filaments suggest the presence of groups of prominence threads, i.e. the fine-structures of prominences, which oscillate coherently (in phase). In addition, mass flows along threads have been often observed. Here, we investigate the effect of mass flows on the collective fast and slow nonadiabatic magnetoacoustic wave modes supported by systems of prominence threads. Prominence fine-structures are modeled as parallel, homogeneous and infinite cylinders embedded in a coronal environment. The magnetic field is uniform and parallel to the axis of threads. Configurations of identical and nonidentical threads are both explored. We apply the T-matrix theory of acoustic scattering to obtain the oscillatory frequency and the eigenfunctions of linear magnetosonic disturbances. We find that the existence of wave modes with a collective dynamics, i.e. those that produce significant perturbations in all threads, is only possible when the Doppler-shifted individual frequencies of threads are very similar. This can be only achieved for very particular values of the plasma physical conditions and flow velocities within threads.