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Science 12 June 2009: Vol. 324. no. 5933, p. 1391 DOI: 10.1126/science.1168045
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Technical Comments
Response to Comment on "Tail Reconnection Triggering Substorm Onset"
Vassilis Angelopoulos,1,*
James P. McFadden,2
Davin Larson,2
Charles W. Carlson,2
Stephen B. Mende,2
Harald Frey,2
Tai Phan,2
David G. Sibeck,3
Karl-Heinz Glassmeier,4
Uli Auster,4
Eric Donovan,5
Ian R. Mann,6
I. Jonathan Rae,6
Christopher T. Russell,1
Andrei Runov,1
Xu-Zhi Zhou,1
Larry Kepko7
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.
1 Institute of Geophysics and Planetary Physics, Department of Earth and Space Sciences, University of California at Los Angeles, Los Angeles, CA 90095, USA.
2 Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA 94729, USA.
3 Code 674, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA.
4 Technical University of Braunschweig, Braunschweig, D-38106, Germany.
5 Department of Physics and Astronomy, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
6 Department of Physics, University of Alberta, Edmonton, Alberta T6G 2M7, Canada.
7 Space Science Center, University of New Hampshire, Durham, NH 03824, USA.
* To whom correspondence should be addressed. E-mail: vassilis{at}ucla.edu
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