Fig. 1


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Three examples of large field fluctuations . (a) An auroral substorm at BRW, Alaska, (b) an SSC at GUA, Guam, 6° N, 144° W CGM), and (c) Pc5 pulsations (0945–1015 UT) at NAQ, Greenland. The 99.97th percentile of is also shown.

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