Observations and Simulations of Ca II H and Ca II 8662

Physics

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Scientific paper

We study chromospheric dynamics by analyzing long high spatial resolution time series of spectra of the Ca II H line and the Ca II infrared line at 8662 Å, recorded simultaneously near disk center of the sun. The observations were made at the VTT, Tenerife. The time series have a temporal resolution of 3 (8662) and 6 s (H), respectively. After the statistical analysis of the observation results, we used 1-D chromosphere simulation codes to make a series of computations with purely acoustic waves to obtain a time series of synthetic line profiles for Ca II H. A comparison of observational and theoretical results shows profound differences between these model calculations and the observations. A more detailed description of this work is in preparation and will be published in a main astronomy journal.

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