Parameters of the midlatitude positive bays (MPB) Calculated at Space Research and Technology Institute, Sofia, Bulgaria Station: PAG Date of observation: 20.08.2009 beginning time = 1314 min.(UT), 21:54 UT Xbegin = -8.626 nT time of max = 1348 min.(UT), 22:28 UT Xmax = 7.358 nT Y at Xmax = 1.426 nT endtime = 1379 min.(UT), 22:59 UT Xend = -0.732 nT amplitude = 15.984 nT base duration time = 65 min. 2sigma = 4.901 nT duration at 2sigma = 19 min. flagbegin = 0 flagend = 0 flagxcheck = 0