Parameters of the midlatitude positive bays (MPB) Calculated at Space Research and Technology Institute, Sofia, Bulgaria Station: PAG Date of observation: 31.12.2017 beginning time = 1260 min.(UT), 21: 0 UT Xbegin = -1.246 nT time of max = 1286 min.(UT), 21:26 UT Xmax = 5.552 nT Y at Xmax = 3.486 nT endtime = 1334 min.(UT), 22:14 UT Xend = -3.684 nT amplitude = 6.798 nT base duration time = 74 min. 2sigma = 2.181 nT duration at 2sigma = 16 min. flagbegin = 0 flagend = 0 flagxcheck = 0