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Comment on “Tail Reconnection Triggering Substorm Onset”

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Science  12 Jun 2009:
Vol. 324, Issue 5933, pp. 1391
DOI: 10.1126/science.1167726

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Angelopoulos et al. (Research Articles, 15 August 2008, p. 931) reported that magnetic reconnection in Earth’s magnetotail triggered the onset of a magnetospheric substorm. We provide evidence that (i) near-Earth current disruption, occurring before the conventional tail reconnection signatures, triggered the onset; (ii) the observed auroral intensification and tail reconnection are not causally linked; and (iii) the onset they identified is a continuation of earlier substorm activities.

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