Parameters of the midlatitude positive bays (MPB) Calculated at Space Research and Technology Institute, Sofia, Bulgaria Station: PAG Date of observation: 28.04.2007 beginning time = 1347 min.(UT), 22:27 UT Xbegin = -3.414 nT time of max = 1367 min.(UT), 22:47 UT Xmax = 10.046 nT Y at Xmax = 4.088 nT endtime = 1402 min.(UT), 23:22 UT Xend = -6.092 nT amplitude = 13.460 nT base duration time = 55 min. 2sigma = 11.405 nT duration at 2sigma = 0 min. flagbegin = 0 flagend = 0 flagxcheck = 0