First local helioseismic experiments with CO5BOLD
Abstract
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 β=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'.
- Publication:
-
Astronomische Nachrichten
- Pub Date:
- March 2007
- DOI:
- 10.1002/asna.200610738
- arXiv:
- arXiv:astro-ph/0701029
- Bibcode:
- 2007AN....328..323S
- Keywords:
-
- Sun: helioseismology;
- Sun: magnetic fields;
- Sun: chromosphere;
- Astrophysics
- E-Print:
- 6 pages, 4 figures, to appear in Astron. Nachrichten, proceedings of the First HELAS Local Helioseismology Workshop "Roadmap for European Local Helioseismology", Nice, 2006