Fig. 4From: Substorm and pseudo-substorm Pi2 pulsations observed during the interval of quasi-periodic magnetotail flow bursts: A case studyPi2 parameters obtained by the moving-time-window calculation of KAK magnetic field data. (a) Ellipticity, defined positive for clockwise sense of rotation. (b) Azimuth of the major axis of polarization. The angle is measured from the positive H axis, positive counterclockwise. (c) Band-integrated Pi2 amplitude.Back to article page