Technical Comments

Response to 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.1168045

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Lui challenges our conclusion that magnetic reconnection triggered the onset of a magnetospheric substorm. However, Lui incorrectly uses the auroral electrojet index instead of ground auroral and magnetic field pulsation signatures to determine substorm onset; single velocity and magnetic field components instead of full vectors and particle distributions to identify reconnection onset; and preliminary auroral electrojet–low index (AL) instead of ground magnometer, auroral, and magnetotail data to claim pre-existing activity.

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