Interactions of a Solar Coronal Wave with Solar Coronal Structures

Since solar coronal waves were discovered, whether these waves are true waves has been an actively studied subject which is still inconclusive. On August 4, 2011, the Solar Dynamics Observatory (SDO) observed a coronal wave in the 19.3nm channel. We have found from the SDO data that the coronal wave interacted with several coronal structures. When the coronal wave encountered a filament channel, the coronal wave was split into a reflection component and a transmission component with the latter propagating along the original direction of the wave. When the coronal wave passed through an active region with a high speed a new bright semi-arc wave front was formed. Based on our analysis, we think the semi-arc wave front may belong to a refraction component of the coronal wave due to certain interaction with the active region. After the refraction component passed through the active region, its wave front appeared in the semi-arc shape. The coronal wave was also reflected when it interacted with two bright structures in the corona. All the reflections/refraction as found imply that this coronal wave is a true wave.