Starship Asterisk*

I wonder what the mechanism of the tsunami is and what the speed can tell us about the properties of the material involved. Is it a pressure wave or an electromagnetic wave? Are we seeing the expanding edge of a semi-spherical phenomenon, i.e. is the wave also traveling down into the Sun? Are such w...

Also, I'm a little confused about it being found by SOHO. I know SOHO is the most prolific comet finder ever, I think finding hundreds as they swing near enough to the sun to pass into its narrow field of view, but comets generally are very dull after passing close to the sun. In contrast, the APOD...