Fine Structures of an EUV Wave Event from Multi-Viewpoint Observations

In this study, we investigate an extreme ultraviolet (EUV) wave event on 2010 February 11, which occurred as a limb event from the Earth viewpoint and a disk event from the STEREO–B viewpoint. We use the data obtained by the Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory (SDO) in various EUV channels. The EUV wave event was launched by a partial prominence eruption. Similar to some EUV wave events in previous works, this EUV wave event contains a faster wave with a speed of $\sim$445$\pm$6 km s${}^{-1}$, which we call coronal Moreton wave, and a slower wave with a speed of $\sim$298$\pm$5 km s${}^{-1}$, which we call “EIT wave”. The coronal Moreton wave is identified as a fast-mode wave and the “EIT wave” is identified as an apparent propagation due to successive field-line stretching. We also observe a stationary front associated with the fast mode EUV wave. This stationary front is explained as mode conversion from the coronal Moreton wave to a slow-mode wave near a streamer.