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Table 3 Details of intense geomagnetic storms with Dst < −50 nT and effects on VLF signals during data analysis

From: Space weather effects on the low latitude D-region ionosphere during solar minimum

Storm days Dst VLF amplitude perturbations
14 to 16 Dec 2006 −146 nT Seen on NWC and NPM
24 to 25 March 2007 −72 nT None
21 to 22 May 2007 −63 nT None
25 to 26 October 2007 −52 nT None
20 to 21 November 2007 −59 nT No data
8 to 9 March 2008 −72 nT None
11 to 12 October 2008 −54 nT None