Fig. 2From: Automated detection of geomagnetic storms with heightened risk of GICSquared first time derivative (FD) of the time series. The form is similar to the MODWT of the function, but the signal is noisier. This could sometimes make it more difficult to clearly define the edges of a peak. The high-frequency part of the SSC is marked on either side by the two dashed gray lines Back to article page