We thank two anonymous reviewers for their useful comments and suggestions. We thank Benno Blumenthal for the IRI Data Library. This paper was funded in part by a grant/cooperative agreement from the National Oceanic and Atmospheric Administration (NOAA), contract NA07GP0213 with the Trustees of Columbia University. The views expressed herein are those of the authors and do not necessarily reflect the views of NOAA or any of its subagencies. The second author was supported by the National Science Foundation (ATM0332910), National Aeronautics and Space Administration (NNG04GG46G), and the National Oceanographic and Atmospheric Administration (NA04OAR4310034).
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