Abstract
We utilize chromospheric observations obtained at MLSO of the 2006 December 6 Moreton wave, which exhibits two distinct fronts, and subsequent filament activation to conduct a comprehensive analysis of the wave-filament interaction. By determining the period, amplitude, and evolution of the oscillations in the activated filament, we make certain inferences regarding the physical properties of both the wave and the filament. The large-amplitude oscillations induced in the filament by the wave passage last on the order of 180 minutes and demonstrate a complicated mixture of transverse and perpendicular motion with respect to the filament spine. These oscillations are predominantly along the filament axis, with a period of ~29 minutes and maximum line-of-sight velocity amplitude of ~41 km s−1. A careful examination of the complex oscillatory response of the filament elucidates some of the fundamental characteristics of the related Moreton wave. Specifically, we infer the maximum total kinetic energy involved in the interaction, the structure and topology of the passing wave, and discuss implications for the topology of the responding magnetic structure supporting the filament. The results of this observational study equip us with a better understanding of how filaments become activated and the nature of their responses to large propagating disturbances.
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