Changing Photospheric Vector Magnetic Fields Associated with a B4.2-class Solar Flare

Su Jiangtao, National Astronomical Observatories, Chinese Academy of Sciences
Liu Yu, National Astronomical Observatories, Yunnan observatory, Chinese Academy of Sciences
Shen Yuandeng, National Astronomical Observatories, Yunnan observatory, Chinese Academy of Sciences

Abstract
Recent observations have provided evidence that the solar photospheric magnetic fields could have rapid and permanent changes in both longitudinal and transverse components associated with large (X- or M-class) solar flares. However, little work on small ones has been reported on this field. In this paper we find the observational evidence of changing photospheric vector magnetic fields associated with a B4.2-class flare obtained with the Solar Magnetic Field Telescope (SMFT) installed at Huairou Solar Observing Station (HSOS) of Nation Astronomical Observatories of Chinese Academy of Sciences.