Are "EIT Waves" Fast-Mode MHD Waves?

Details Are "EIT Waves" Fast-Mode MHD Waves? Are "EIT Waves" Fast-Mode MHD Waves?

2007-04-23

arxiv.org/abs/0704.2828v1

Astrophys.J.664:556-562,2007

Astronomy and Astrophysics

Astrophysics

to be published in the Astrophysical Journal

Scientific paper

10.1086/519013

We examine the nature of large-scale, coronal, propagating wave fronts (``EIT waves'') and find they are incongruous with solutions using fast-mode MHD plane-wave theory. Specifically, we consider the following properties: non-dispersive single pulse manifestions, observed velocities below the local Alfven speed, and different pulses which travel at any number of constant velocities, rather than at the ``predicted'' fast-mode speed. We discuss the possibility of a soliton-like explanation for these phenomena, and show how it is consistent with the above-mentioned aspects.

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