Parameters of the midlatitude positive bays (MPB) Calculated at Space Research and Technology Institute, Sofia, Bulgaria Station: PAG Date of observation: 04.06.2009 beginning time = 1370 min.(UT), 22:50 UT Xbegin = -4.106 nT time of max = 1409 min.(UT), 23:29 UT Xmax = 5.274 nT Y at Xmax = -0.210 nT endtime = 1459 min.(UT), 24:19 UT Xend = -1.758 nT amplitude = 9.380 nT base duration time = 89 min. 2sigma = 3.419 nT duration at 2sigma = 34 min. flagbegin = 0 flagend = 0 flagxcheck = 0