Propagation of irregular magnetic pulsation using cross wavelet and maximum time energy methods

Abstract

The propagation of Pi2 pulsation provides more invaluable information about the dynamics of the magnetosphere and the transmission of energy during magnetic substorms. Several authors used ground based magnetometers and in situ spacecraft data to map Pi2s propagation using different methods. Few methods have been used to calculate the time of propagation with some cautions. So, several authors compared results with different methods. The current paper compares the time of Pi2 propagation and direction calculated by Maximum Time Energy (MTE) method with the cross wavelet method (XWT). Results show that regardless the low correlation coefficient<0.75 and the complicated waveform of the Pi2 pulsations or even a non-isolated event, the cross wavelet method has good results with the suggested Pi2 propagation mechanism from lower to higher latitudinal region than the Maximum Time Energy method.