There were few follow-up studies for decades. Then the 1995 launch of theSolar and Heliospheric Observatory (SOHO) led to observation of coronal waves, which cause Moreton waves. Moreton waves were a research topic again. (SOHO'sEIT instrument discovered another, different wave type called "EIT waves".)[6] The reality of Moreton waves (also known as fast-modeMHD waves) has also been confirmed by the twoSolar Terrestrial Relations Observatory (STEREO) spacecraft. They observed a 100,000-km-high wave of hot plasma and magnetism, moving at 250 km/s, in conjunction with a bigcoronal mass ejection in February 2009.[7][8]Moreton measured the waves propagating at aspeed of 500–1500 km/s.[7] Yutaka Uchida interpreted Moreton waves as MHD fast mode shock waves propagating in the corona.[9] He links them to type II radio bursts, which are radio-wave discharges created when coronal mass ejections accelerate shocks.[10]
Moreton waves can be observed primarily in theHα band.[11]
^Balasubramaniam, K. S.; Cliver, E. W.; Pevtsov, A.; Temmer, M.; Henry, T. W.; Hudson, H. S.; Imada, S.; Ling, A. G.; Moore, R. L.; Muhr, N.; Neidig, D. F.; Petrie, G. J. D.; Veronig, A. M.; Vršnak, B.; White, S. M. (1 November 2010). "ON THE ORIGIN OF THE SOLAR MORETON WAVE OF 2006 DECEMBER 6".The Astrophysical Journal.723 (1):587–601.doi:10.1088/0004-637X/723/1/587.
^Moreton, G. E. (1960). "Hα Observations of Flare-Initiated Disturbances with Velocities ~1000 km/sec".Astronomical Journal.65: 494.Bibcode:1960AJ.....65U.494M.doi:10.1086/108346.
^Sakurai, Takashi (3 September 2002)."SolarNews Newsletter". Solar Physics Division, American Astronomical Society. Archived fromthe original on 27 August 2011. Retrieved15 June 2011.
