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Table 2 List of substorms in the St. Patrick’s Day 2015 geomagnetic storm and the duration of their expansion phases have been derived from ground magnetic perturbations reflected in AL index, Wp index, IL index and H-component of geomagnetic disturbances

From: Global and local Joule heating during substorms in St. Patrick’s Day 2015 geomagnetic storm

Event no Event list AL (minimum) (nT) Wp index (maximum) (nT) IL index (minimum) (nT) Variance of H-comp × 104 (nT)2 Expansion-phase onset (UT) End of expansion phase (UT)
1 March 17–18 − 2300 2.64 − 1662 10.08 22:58 (01:44 MLT) 00:41 (03:27 MLT)
2 March 18–19 − 841 0.34 − 879 4.83 22:28 (00:49 MLT) 01:54 (04:15 MLT)
3 March 20 − 551 0.3 − 673 3.37 00:18 (02:59 MLT) 02:40 (05:21 MLT)
4 March 20 − 440 0.29 − 804 3.85 19:16 (22:13 MLT) 20:21 (23:19 MLT)
5 March 20–21 − 884 1.0 − 1049 6.07 22:05 (00:37 MLT) 00:30 (03:02 MLT)
  1. Their time span in MLT is given within brackets