Parameters of the midlatitude positive bays (MPB) Calculated at Space Research and Technology Institute, Sofia, Bulgaria Station: PAG Date of observation: 23.05.2009 beginning time = 1267 min.(UT), 21: 7 UT Xbegin = 0.596 nT time of max = 1285 min.(UT), 21:25 UT Xmax = 7.250 nT Y at Xmax = 2.242 nT endtime = 1314 min.(UT), 21:54 UT Xend = -3.616 nT amplitude = 6.654 nT base duration time = 47 min. 2sigma = 2.403 nT duration at 2sigma = 24 min. flagbegin = 0 flagend = 0 flagxcheck = 0