Dynamic Hydrogen Ionization in Simulations of the Solar Chromosphere

Details Dynamic Hydrogen Ionization in Simulations of the Solar Chromosphere Dynamic Hydrogen Ionization in Simulations of the Solar Chromosphere

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..354..306l&link_type=abstract

Solar MHD Theory and Observations: A High Spatial Resolution Perspective ASP Conference Series, Vol. 354, Proceedings of the Con

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Since the assumption of statistical equilibrium does not hold under the conditions of the dynamical solar chromosphere, the time dependence of the rate equations has to be taken into account when calculating ionization stages of elements. We present a method based on the work by Sollum (1999) to calculate the dynamic hydrogen ionization degree and electron density in the 3-D radiation-hydrodynamics code CO^5BOLD. In our model chromosphere, both quantities are more constant over time and horizontal position than LTE theory predicts. We compare synthetic brightness temperature images at λ=1~mm calculated with LTE and time-dependent NLTE electron densities. Both formation height and average brightness temperature change significantly compared to LTE when using time-dependent electron densities.

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