Moreton wave

They are named for American astronomer Gail Moreton, an observer at the Lockheed Solar Observatory in Burbank, and Harry E. Ramsey, an observer who spotted them in 1959 at The Sacramento Peak Observatory.

[2][3][4] He discovered them in time-lapse photography of the chromosphere in the light of the Balmer alpha transition.

They observed a 100,000-km-high wave of hot plasma and magnetism, moving at 250 km/s, in conjunction with a big coronal mass ejection in February 2009.

[8] He links them to type II radio bursts, which are radio-wave discharges created when coronal mass ejections accelerate shocks.

[9] Moreton waves can be observed primarily in the Hα band.