Parameters of the midlatitude positive bays (MPB) Calculated at Space Research and Technology Institute, Sofia, Bulgaria Station: PAG Date of observation: 31.05.2010 beginning time = 1310 min.(UT), 21:50 UT Xbegin = -5.876 nT time of max = 1351 min.(UT), 22:31 UT Xmax = 8.418 nT Y at Xmax = 0.390 nT endtime = 1371 min.(UT), 22:51 UT Xend = -2.844 nT amplitude = 14.294 nT base duration time = 61 min. 2sigma = 7.462 nT duration at 2sigma = 4 min. flagbegin = 0 flagend = 0 flagxcheck = 0