Fig. 7.
From: The STEL induction magnetometer network for observation of high-frequency geomagnetic pulsations
The H component of the magnetic field fluctuations as observed at 1028:00–1030:00 UT on February 27, 2009 at the five stations from higher (top) to lower (bottom) latitudes. The vertical scale indicated at the left side of the panel is calculated at the peak sensitivity of each station. The original data sampled at 64 Hz are averaged over sets of 4 data points (16 Hz) in order to reduce the noise. The polarity of the MSR data is reversed in order to account for the difference between the sensor polarity of the magnetometer at MSR and that of the other stations.