Volume 590, June 2016
|Number of page(s)||5|
|Published online||16 May 2016|
Simulated interaction of magnetohydrodynamic shock waves with a complex network-like region ⋆
Instituto de Astrofísica de Canarias,
La Laguna, Tenerife,
2 Centre for mathematical Plasma Astrophysics, Department of Mathematics, KU Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium
3 Departamento de Astrofísica, Universidad de La Laguna, 38205, La Laguna, Tenerife, Spain
4 Main Astronomical Observatory, NAS 03680 Kyiv, Ukraine
Received: 15 March 2016
Accepted: 27 April 2016
We provide estimates of the wave energy reaching the solar chromosphere and corona in a network-like magnetic field topology, including a coronal null point. The waves are excited by an instantaneous strong subphotospheric source and propagate through the subphotosphere, photosphere, chromosphere, transition region, and corona with the plasma beta and other atmospheric parameters varying by several orders of magnitude. We compare two regimes of the wave propagation: a linear and nonlinear regime. While the amount of energy reaching the corona is similar in both regimes, this energy is transmitted at different frequencies. In both cases the dominant periods of waves at each height strongly depend on the local magnetic field topology, but this distribution is only in accordance with observations in the nonlinear case.
Key words: magnetohydrodynamics (MHD) / shock waves / waves / Sun: atmosphere / Sun: corona / Sun: magnetic fields
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© ESO, 2016
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