Magnetomechanical supersonic waves in dark molecular clouds

We propose and investigate the magnetoelastodynamic mechanism of the wave m otions of poorly ionized superparamagnetic gas-dust interstellar medium cap able of sustaining long-ranged magnetization. It is suggested that the mole cular linewidths inferred from recent Zeeman measurements of the magnetic f ield toward the core position in dark interstellar molecular clouds may be due to transverse magnetomechanical waves traveling with supersonic, but su b-Alfvenic, speed.