Are EIT waves slow mode blast waves?

Details Are EIT waves slow mode blast waves? Are EIT waves slow mode blast waves?

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh53a1047k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH53A-1047

Computer Science

Sound

7509 Corona, 7519 Flares, 7827 Kinetic And Mhd Theory

Scientific paper

We describe properties and characteristics of EIT waves and dimmings as observed by SOHO, and we show that they better correspond to propagating waves than to any diffusion process. We show that they have clearly pronounced similarities with the blast waves. There is a density and temperature increase around leading edge of the wave front and decrease behind. Presumably, they propagate from the region where the magnetic field decreases due to reconnection. However the velocities of these waves are typically small with respect to the Alfven speed. Blast waves are commonly associated with explosions or rapid energy releases. They were intensively studied theoretically and self-similar solutions of equations were found for sound waves without a magnetic field and for fast magnetosonic waves. We show that similar types of solutions exist for slow mode waves when they propagate obliquely to the magnetic field. Several observational features argue in favour of the hypothesis that EIT waves are slow mode blast waves.

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