Fig. 1.

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Comparison of PCN values for June 2015 from download from http://pcindex.org on 30 June termed “prompt” values and download on 25 October 2017 termed “final” PCN values. The upper panel presents (in blue line) values of the solar wind merging electric field (E M) and (in red line) the IMF B Y component (OMNI data). The bottom panel presents the differences between prompt and final PCN values.
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