Parameters of the midlatitude positive bays (MPB) Calculated at Space Research and Technology Institute, Sofia, Bulgaria Station: PAG Date of observation: 19.12.2017 beginning time = 1257 min.(UT), 20:57 UT Xbegin = -5.736 nT time of max = 1312 min.(UT), 21:52 UT Xmax = 5.664 nT Y at Xmax = -3.878 nT endtime = 1347 min.(UT), 22:27 UT Xend = -0.422 nT amplitude = 11.400 nT base duration time = 90 min. 2sigma = 3.365 nT duration at 2sigma = 28 min. flagbegin = 2 flagend = 0 flagxcheck = 0