Moreton wave
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Animation of a Moreton wave which occurred on December 6, 2006
A Moreton wave is the chromospheric signature of a large-scale solar coronal shock wave . Described as a kind of solar "tsunami", they are generated by solar flares. They are named for American astronomer Gail Moreton, who first reported their existence as found in observations by Harry Ramsey.
Moreton waves propagate at a speed of 500-1500 km/s, and occur where a coronal Magnetohydrodynamic fast-mode weak shock wave intersects the chromosphere according to a well-known theory of Yutaka Uchida that links them to radio type II bursts. Moreton waves can be observed primarily in the Hα band.[1]
[edit] References
- ^ N. Narukage, et al. (2004). "Moreton waves observed at Hida Observatory" (PDF). Proceedings IAU Symposium 2004 (223): 367–370. doi:. http://journals.cambridge.org/production/action/cjoGetFulltext?fulltextid=288483. Retrieved on 2006-12-11.
[edit] External links
- Definition at the Encyclopedia of Astrobiology, Astronomy and Space flight
- Space.com article mentioning Moreton waves
- Animated picture of a Moreton wave
- Moreton waves and coronal waves The Astrophysical Journal, 572:L99–L102, 2002 June 10.
- EVIDENCE OF EIT AND MORETON WAVES IN NUMERICAL SIMULATIONS at Montana State University.
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