Fig. 9.
From: Wavelet-based multiscale analysis of geomagnetic disturbance
Horizontal component temporal behaviour, as seen by one-minute values at the THL observatory, and associated wavelet spectral exponents. From top-left (1st column) to bottom-right (2nd column) are shown in chronological order the events of 15 May, 1997, 15 July, 2000, 7 September, 2002, October, 2003, 4 November, 2003 and 20 November, 2003.