The gradients of line-of-sight magnetic fields in active region NOAA 6
659 on 1991 June 8 have been calculated based on the photospheric and
chromospheric Magnetograms taken at Huairou Solar Observing Station. W
e found that high gradients coincided with high strengths of the trans
verse magnetic fields, implying a complicated configuration of the mag
netic field in the lower atmosphere. For this extraordinarily flare-pr
olific region, a possible relationship between the gradients and the f
lares was inferred.