Parameters of the midlatitude positive bays (MPB) Calculated at Space Research and Technology Institute, Sofia, Bulgaria Station: PAG Date of observation: 04.09.2017 beginning time = 1377 min.(UT), 22:57 UT Xbegin = -17.966 nT time of max = 1430 min.(UT), 23:50 UT Xmax = 17.806 nT Y at Xmax = 8.670 nT endtime = 1474 min.(UT), 24:34 UT Xend = -10.622 nT amplitude = 35.772 nT base duration time = 97 min. 2sigma = 8.322 nT duration at 2sigma = 42 min. flagbegin = 0 flagend = 0 flagxcheck = 0