MHD Mode Conversion around a 2D Magnetic Null Point

Details MHD Mode Conversion around a 2D Magnetic Null Point MHD Mode Conversion around a 2D Magnetic Null Point

2009-07-09

arxiv.org/abs/0907.1541v1

Cool Stars, Stellar Systems and the Sun: 15th Cambridge Workshop, CP1094, 752-755, (2009)

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

4 pages, 2 figures

Scientific paper

10.1063/1.3099224

Mode conversion occurs when a wave passes through a region where the sound and Alfven speeds are equal. At this point there is a resonance, which allows some of the incident wave to be converted into a different mode. We study this phenomenon in the vicinity of a two-dimensional, coronal null point. As a wave approaches the null it passes from low- to high-beta plasma, allowing conversion to take place. We simulate this numerically by sending in a slow magnetoacoustic wave from the upper boundary; as this passes through the conversion layer a fast wave can clearly be seen propagating ahead. Numerical simulations combined with an analytical WKB investigation allow us to determine and track both the incident and converted waves throughout the domain.

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