First local helioseismic experiments with CO5BOLD

Details First local helioseismic experiments with CO5BOLD First local helioseismic experiments with CO5BOLD

2007-01-02

arxiv.org/abs/astro-ph/0701029v2

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures, to appear in Astron. Nachrichten, proceedings of the First HELAS Local Helioseismology Workshop "Roadmap f

Scientific paper

10.1002/asna.200610738

With numerical experiments we explore the feasibility of using high frequency waves for probing the magnetic fields in the photosphere and the chromosphere of the Sun. We track a plane-parallel, monochromatic wave that propagates through a non-stationary, realistic atmosphere, from the convection-zone through the photosphere into the magnetically dominated chromosphere, where it gets refracted and reflected. We compare the wave travel time between two fixed geometrical height levels in the atmosphere (representing the formation height of two spectral lines) with the topography of the surface of equal magnetic and thermal energy density (the magnetic canopy or beta=1 contour) and find good correspondence between the two. We conclude that high frequency waves indeed bear information on the topography of the `magnetic canopy'.

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