Parameters of the midlatitude positive bays (MPB) Calculated at Space Research and Technology Institute, Sofia, Bulgaria Station: PAG Date of observation: 04.05.2013 beginning time = 1265 min.(UT), 21: 5 UT Xbegin = -3.160 nT time of max = 1292 min.(UT), 21:32 UT Xmax = 5.316 nT Y at Xmax = 2.832 nT endtime = 1342 min.(UT), 22:22 UT Xend = -3.470 nT amplitude = 8.476 nT base duration time = 77 min. 2sigma = 3.183 nT duration at 2sigma = 30 min. flagbegin = 0 flagend = 0 flagxcheck = 0