Parameters of the midlatitude positive bays (MPB) Calculated at Space Research and Technology Institute, Sofia, Bulgaria Station: PAG Date of observation: 15.09.2009 beginning time = 1353 min.(UT), 22:33 UT Xbegin = 1.696 nT time of max = 1367 min.(UT), 22:47 UT Xmax = 4.812 nT Y at Xmax = -0.900 nT endtime = 1399 min.(UT), 23:19 UT Xend = -6.772 nT amplitude = 3.116 nT base duration time = 46 min. 2sigma = 3.407 nT duration at 2sigma = 12 min. flagbegin = 0 flagend = 0 flagxcheck = 0