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Flare and Moreton Wave From AR 11227 May 29, 2011 | Time-lapse ( Takes a moment for frames to load.) Thomas Ashcraft | Mail | Heliotown | New Mexico The C8.7 flare lasted from 2100 UT to 2130 UT. The Moreton wave is still being analyzed. This flare also produced moderate Type II radio sweeps. and coronal mass ejection. Radio chart below
Raw image full size time-lapse here 5 MB: http://www.heliotown.com/SMWmay292011_2106_2115UT_Ashcraft.gif Telescope : Lunt 60/50mm double -stacked H-a .5Å : Camera : DMK 41 Here is another Moreton Wave captured on February 14, 2011: : From Wikipedia: 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, an observer at the Lockheed Solar Observatory in Burbank who spotted them in 1959. 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 and Heliospheric Observatory led to observation of coronal waves, which cause Moreton waves. Moreton waves were a research topic again. The reality of Moreton waves (aka fast-mode MHD -magnetohydrodynamic - waves) has also been confirmed by the two STEREO spacecraft. They observed a 100,000-km high wave of hot plasma and magnetism, moving at 250 km/second, in conjunction with a big coronal mass ejection in February 2009. 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 Hydrogen-alpha band. _____________________________________________________________________________ Links to other Moreton wave movies and images: http://www.mssl.ucl.ac.uk/surf/ydac/nuggets/2002/020208/halpha_nov03.mpg http://iopscience.iop.org/1538-4357/560/1/L105/15374.fg1.html http://www.mssl.ucl.ac.uk/surf/ydac/nuggets/2002/020208/020208.html
Great view: http://www.nso.edu/staff/bala/moretonwave_java.html http://iopscience.iop.org/0004-637X/685/1/629/fulltext http://www.mssl.ucl.ac.uk/surf/ydac/nuggets/1998/981225/981225.html
General flare movies in H-a: http://center.stelab.nagoya-u.ac.jp/web1/cawses/2004/ob0045/movie/ http://articles.adsabs.harvard.edu//full/2004IAUS..223..367N/0000369.000.html |
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