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Astron. Astrophys. 359, 766-776 (2000)

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Propagation of shock waves in the solar corona with 2-D loop structures

D. Odstril and M. Karlický

Astronomical Institute, 251 65 Ondejov, Czech Republic (odstrcil,karlicky@asu.cas.cz)

Received 3 April 2000 / Accepted 4 May 2000

Abstract

Motivated by recent observations of type II radio bursts, we study propagation of shock waves by the two-dimensional numerical magnetohydrodynamic model. Explosion of a hot plasma is investigated for various ratios of the mass density and magnetic field intensity in a fan of coronal loops. Ducting of shock waves occurs along loop-like structure and ducting of possible radio emission in under-dense coronal loops is expected. This provides an alternative to classical explanation that two distinctly separated type II radio bursts are caused by two different shocks. The presented results support the idea that a single solar flare energy release with a single shock can generate coronal disturbances observed as two separate type II radio bursts.

Key words: Magnetohydrodynamics (MHD) – shock waves – methods: numerical – Sun: corona – Sun: radio radiation

Send offprint requests to: D. Odstril

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© European Southern Observatory (ESO) 2000

Online publication: July 7, 2000
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