Parameters of the midlatitude positive bays (MPB) Calculated at Space Research and Technology Institute, Sofia, Bulgaria Station: PAG Date of observation: 31.07.2007 beginning time = 1326 min.(UT), 22: 6 UT Xbegin = -1.140 nT time of max = 1358 min.(UT), 22:38 UT Xmax = 4.968 nT Y at Xmax = 0.978 nT endtime = 1383 min.(UT), 23: 3 UT Xend = -0.126 nT amplitude = 6.108 nT base duration time = 57 min. 2sigma = 3.277 nT duration at 2sigma = 21 min. flagbegin = 0 flagend = 0 flagxcheck = 0