Su, J. T; Ji, K. F; Cao, W; Banerjee, D; Priya, T. G; Zhao, J. S; Bai, X. Y; Chen, J; Zhang, M; Ji, H. S
(IOP Publishing, 2016-02)
We study the umbral waves as observed by chromospheric imaging observations of two sunspots with the New
Solar Telescope at the Big Bear Solar Observatory. We find that the wavefronts (WFs) rotate clockwise and form ...