New Vacuum Solar Telescope Fringe Removal Based on “Fringes Flat Field”

The solar chromosphere data products of the New Vacuum Solar Telescope (NVST) have been affected by the interference fringes since its first operation. These fringes have a serious impact on the quality of NVST high-resolution data, which are reconstructed by short-exposure data. In order to improve the quality of NVST high-resolution data, this article proposes a method based on “Fringes Flat Field” to remove the interference fringes in NVST short-exposure data. We made the “Fringes Flat Field” using Adaptive Wavelet Transform (AWT) and Butterworth low-pass filter. The results of the experiments are satisfactory, and the method cannot only remove the fringes effectively, but keep the solar structures from being lost.