Observational Evidence for Shocks in the Solar Photosphere - New TESOS/VTT Results

Details Observational Evidence for Shocks in the Solar Photosphere - New TESOS/VTT Results Observational Evidence for Shocks in the Solar Photosphere - New TESOS/VTT Results

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.36r&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

High-resolution spectroscopic observations recently acquired with the TESOS spectrometer at the Vacuum Tower Telescope (VTT, Observatorio del Teide, Tenerife) are used to test predictions regarding strongly dynamic events in the photosphere as obtained from three-dimensional numerical simulations with the CO5BOLD-code.
Time series of two-dimensional maps of the Fe I 543.4 nm spectral line profile at different centre-to-limb positions are investigated in a statistical sense by comparing the distributions of individual spectral parameters derived from observations with the corresponding distributions from synthesized spectra calculated with the LINFOR3D code from the simulations. Appropriate degradation of the synthesized spectra was applied in order to take the limited spatial resolution of the telescope, seeing effects, and the scattered instrumental light into account.
At the actual spatial resolution of 0.5 arc sec, the statistics show that signatures of the photospheric dynamics, including the most dynamical events like occasional supersonic flows of plasma in the nearly horizontal direction, are very similar in both observations and simulations.
Discrepancies are found only for those spectral parameters (residual line intensity, Doppler line core shifts), which are affected by non-LTE effects, since non-LTE effects are not taken into account in the synthesis of the Fe I 543.4nm spectral line.

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