The typical blazar S5 0716 + 714 is very interesting due to its rapid and large amplitude variability and high duty cycle of micro-variability in optical band .
We analyze the observations in I , R and V bands obtained with the 1.0 m telescope at Weihai observatory of Shandong University from 2011 to 2018 .
The model of synchrotron radiation from turbulent cells in a jet has been proposed as a mechanism for explaining micro-variability seen in blazar light curves .
Parameters such as the sizes of turbulent cells , the enhanced particle densities , and the location of the turbulent cells in the jet can be studied using this model .
The model predicts a time lag between variations as observed in different frequency bands .
Automatic model fitting method for micro-variability is developed , and the fitting results of our multi-frequency micro-variability observations support the model .
The results show that both the amplitude and duration of flares decomposed from the micro-variability light curves confirm to the log-normal distribution .
The turbulent cell size is within the range of about 5 to 55 AU , and the time lags of the micro-variability flares between the I-R and R-V bands should be several minutes .
The time lags obtained from the turbulence model are consistent with the fitting statistical results , and the time lags of flares are correlated with the time lags of the whole light curve .