Parameters of the midlatitude positive bays (MPB) Calculated at Space Research and Technology Institute, Sofia, Bulgaria Station: PAG Date of observation: 31.05.2008 beginning time = 1087 min.(UT), 18: 7 UT Xbegin = -3.400 nT time of max = 1118 min.(UT), 18:38 UT Xmax = 11.152 nT Y at Xmax = 0.464 nT endtime = 1141 min.(UT), 19: 1 UT Xend = -2.708 nT amplitude = 14.552 nT base duration time = 54 min. 2sigma = 5.181 nT duration at 2sigma = 23 min. flagbegin = 0 flagend = 0 flagxcheck = 0