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 = 1210 min.(UT), 20:10 UT Xbegin = -6.498 nT time of max = 1245 min.(UT), 20:45 UT Xmax = 7.792 nT Y at Xmax = -2.808 nT endtime = 1335 min.(UT), 22:15 UT Xend = -17.236 nT amplitude = 14.290 nT base duration time =125 min. 2sigma = 6.566 nT duration at 2sigma = 8 min. flagbegin = 4 flagend = 4 flagxcheck = 2