Contributed by Marta García Rivas. Posted on June 14, 2021
Similar to sunspots, the stable regions of pores on the Sun are also found to be defined by a critical value of the vertical component of the magnetic field. The critical value is comparable to that found in stable sunspots.
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.