Parameters of the midlatitude positive bays (MPB) Calculated at Space Research and Technology Institute, Sofia, Bulgaria Station: PAG Date of observation: 20.08.2011 beginning time = 1349 min.(UT), 22:29 UT Xbegin = -4.276 nT time of max = 1379 min.(UT), 22:59 UT Xmax = 5.726 nT Y at Xmax = 0.170 nT endtime = 1452 min.(UT), 24:12 UT Xend = -3.540 nT amplitude = 10.002 nT base duration time =103 min. 2sigma = 3.436 nT duration at 2sigma = 36 min. flagbegin = 0 flagend = 0 flagxcheck = 0