Simultaneous observations of solar Ca II H and Ca II 8662 lines and numerical simulation of these lines

We study chromospheric dynamics by analyzing long (5000 s) high spatial resolution time series of spectra of the Ca II H line and the Ca II infrared line at 8662 A recorded simultaneously near disk center of the sun. The observations were made at the Vacuum Tower Telescope, 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 have made with 1-D chromosphere simulation codes a series of computations using pure acoustic and longitudinal MHD waves to get finally a time series of synthetic line profiles for Ca II H and Ca II 8662. A comparison of observation and theoretical results is done.