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We investigate the interaction between two filaments and the subsequentfilament eruption event observed from different view angles by Hinode, theSolar and Heliospheric Observatory (SOHO), and the Solar Terrestrial RelationsObservatory (STEREO). In the event, the two filaments rose high, interactedwith each other, and finally were ejected along two different paths. We measurethe bulk-flow velocity using spectroscopic data. We find significant outflowsat the speed of a few hundreds of km/s during the filament eruption, and alsosome downflows at a few tens of km/s at the edge of the eruption region in thelate stage of the eruption. The erupting material was composed of plasmas witha wide temperature range of 10^4-10^6 K. These results shed light on thefilament nature and the coronal dynamics.

Interaction and Eruption of Two Filaments Observed by Hinode, SOHO, and STEREO