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Fig. 4 | Earth, Planets and Space

Fig. 4

From: Automated detection of geomagnetic storms with heightened risk of GIC

Fig. 4

Time derivative of the Akaike information criterion (AIC). There is a definite peak at the time of SSC. The peak is picked out as an SSC detection if its maximum exceeds a multiple of the variance of the whole function. Note that both edges of the function show noisy behavior. This method looks at windows of data, and the timing is important, making it effective to use overlapping windows when evaluating larger data sets. The high-frequency part of the SSC is marked on either side by the two dashed gray lines

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