Contributed by Johannes Löhner-Böttcher. Posted on September 16, 2015
Multiple-wavelength high-resolution observations reveal running penumbral waves in the middle photosphere, with an apparent horizontal speed of up to 51 km/s.
Contributed by Junwei Zhao. Posted on August 29, 2015
A newly discovered, fast-moving wave propagates outward along sunspots’ radial direction and may provide new diagnostics of the sunspot subsurface structure.