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Fig. 5 | Earth, Planets and Space

Fig. 5

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

Fig. 5

Ground signatures of magnetospheric substorm associated with Pi2 pulsations, observed at the station OUJ during 19:00—05:00 UT on 17–18 March 2015. From top to bottom: a Wp index, b AL index, c H-component of magnetic disturbances observed at the station OUJ and d associated Pi2 event (filtered in the ULF band of 6.5–25 mHz) at OUJ. The onset of Pi2 is marked with a vertical dashed line at 22:58 UT (01:44 MLT in OUJ) on 17 March 2015

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