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Propagation of Moreton Waves View all abstracts by submitter

Yuzong Zhang   Submitted: 2011-04-08 02:57

With FMT and SMART telescopes at Hida Observatory of Kyoto University,13 events of Moreton waves were captured at Hα center,±0.5 Å and ±0.8 Å wavebands since 1997. Withsuch samples, we have studied the statistical properties of thepropagation of Moreton waves. Moreton waves were all restricted insectorial zones with the mean value of 92°. However, theiraccompanied EIT waves, observed simultaneously with SOHO/EIT atExtreme-ultraviolet wavelength, were much isotropic with quiteextended scope of 193°. The average propagation speed of theMoreton waves and the corresponding EIT waves were 664 kms-1 and 205 km s-1, respectively. Moreton waveswere propagating either under the large-scale close magnetic fluxloops, or firstly in the sectorial region where two sets of magneticloops separated each other and diverged, and then stopped before theopen magnetic flux region. The location swept by Moreton waves hadrelatively weak magnetic field compared to the magnetic fields attheir sidewalls. The ratio of magnetic flux density between thesidewalls and path falls in the range of 1.4 to 3.7 at the height of0.01 solar radii. Additionally, we roughly estimated the distributionof fast magnetosonic speed between the propagating path and sidewallsin an event on 1997 November 3, and found the relatively low fastmagnetosonic speed in the path. We also found that the propagatingdirection of Moreton waves coincided with the direction of filamenteruption in a few well-observed events. This favors an interpretationof 'Piston' model, although further studies are necessary fordefinitive conclusion.

Authors: Y.Z. Zhang, R. Kitai, N. Narukage, T. Matsumoto, S. Ueno, K. Shibata and J.X. Wang
Projects: None

Publication Status: PASJ (in press)
Last Modified: 2011-04-08 08:18
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