Analysis of geomagnetic irregular pulsations using the short-time Fourier transform
In order to analyze the geomagnetic phenomena with high time resolution, the power spectrum one minute value of the geomagnetic 10Hz sampling data Memambetsu Magnetic Observatory is obtained using the short-time Fourier transform (STFT).
In order to confirm the one minute value is effective for phenomena analysis, we compared the one minute value of the power spectrum with the Memambetsu Pi2 lists reported by Kakioka Magnetic Observatory from 2012 to 2013. As the result, it showed a good correspondence between the period and the amplitude. Therefore, the STFT is effective method for understanding of geomagnetic short period phenomena.