Search Publications

Running waves observed by Hinode

Liang, H. F.; Yang, W. G.; Ma, L. +1 more

High cadence (up to 9.6 s) intensity images of a sunspot within the active region NOAA 10953 were obtained by the SOT onboard Hinode with the line H α 6563 Å on April 30, 2007. The running difference images show that running waves periodically appear within the sunspot umbra and propagate outward forming full circles or partial arcs. The propagati…