Moreton wave
A Moreton wave, Solar Tsunami, or Moreton-Ramsey wave is 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
.
There were few follow-up studies for decades. Then the 1995 launch of the
Solar 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 big coronal mass ejection in February 2009.[6][7]
Moreton measured the waves propagating at a speed of 500–1500 km/s.[6] Yutaka Uchida interpreted Moreton waves as MHD fast mode shock waves propagating in the corona.[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.[10]
See also
- Asteroseismology
- Gravity wave
- Helioseismology
- OSO 8
- Solar prominence
- Solar spicule
- Solar transition region
References
- ^ Phillips, Tony (November 24, 2009). "Monster Waves on the Sun are Real". NASA. Retrieved 16 July 2010.
- doi:10.1086/108346.
- doi:10.1086/127549.
- doi:10.1086/147098.
- S2CID 120367644.
- ^ a b Atkins, William (26 November 2009). "STEREO spacecraft finds gigantic tsunami on Sun". iTWire. Retrieved 16 July 2010.
- PhysOrg.com. Retrieved 16 July 2010.
- ^ Sakurai, Takashi (3 September 2002). "SolarNews Newsletter". Solar Physics Division, American Astronomical Society. Archived from the original on 27 August 2011. Retrieved 15 June 2011.
- ^ Layton, Laura (May 15, 2009). "STEREO Spies First Major Activity of Solar Cycle 24". NASA. Retrieved 15 June 2011.
- .
- More of Moreton's papers can be found here (SAO/NASA System).
External links
- "Have you ever heard the Sun?" - many recordings (MP3 format) of solar radio emissions including a solar flare shockfront.
