Fig. 8.From: Wavelet-based multiscale analysis of geomagnetic disturbanceHorizontal component temporal behaviour, as seen by one-minute values at the CLF and HER observatories, and associated wavelet spectral exponents. (a) Storms of 15 May, 1997 (left) and 15 July, 2000 (right). (b) Storms of 7 September, 2002 (top and left) and 14 November, 2004 (right).Back to article page