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Extreme ultraviolet (EUV) waves are impressive coronal propagatingdisturbances. They are closely associated with various eruptions, and can usedfor the global coronal seismology and the acceleration of solar energeticparticles. Hence, the study of EUV waves plays an important role in solareruptions and Space Weather. Here we present an EUV wave associated with afilament activation that did not evolve into any eruption. Due to thecontinuous magnetic flux emergence and cancellation around its one end, thefilament rose with untwisting motion, and the filament mass flowed towardsanother end along the rising fields. Intriguingly, following the filamentactivation, an EUV wave formed with a fast constant speed ($\sim$500 kms$^{-1}$) ahead of the mass flow, and the overlying coronal loops expanded bothin lateral and radial directions. Excluding the possibility of a remote flareand an absent coronal mass ejection, we suggest that the EUV wave was onlyclosely associated with the filament activation. Furthermore, their intimatespacial and temporal relationship indicates that the EUV wave was likelydirectly triggered by the lateral expansion of overlying loops. We propose thatthe EUV wave can be interpreted as linear fast-mode wave, and the most vitalkey for the successful generation of the EUV wave is the impulsive early-phaselateral expansion of overlying loops that was driven by the activated filamentmass flow without any eruption.

An Extreme Ultraviolet Wave Associated with A Solar Filament Activation