Parameters of the midlatitude positive bays (MPB) Calculated at Space Research and Technology Institute, Sofia, Bulgaria Station: PAG Date of observation: 04.04.2008 beginning time = 1335 min.(UT), 22:15 UT Xbegin = -17.236 nT time of max = 1364 min.(UT), 22:44 UT Xmax = 12.340 nT Y at Xmax = 10.508 nT endtime = 1405 min.(UT), 23:25 UT Xend = -3.526 nT amplitude = 29.576 nT base duration time = 70 min. 2sigma = 6.566 nT duration at 2sigma = 4 min. flagbegin = 2 flagend = 0 flagxcheck = 0