8 Acknowledgments
I am grateful to Yi-Ming Wang (NRL) and Rick DeVore (NRL) for their comments on the formative
drafts of this manuscript, and to Harry Warren (NRL) for helping me to put the manuscript in the format
required by Living Reviews in Solar Physics. I appreciate the thoughtful comments of two referees
who suggested several of the references listed in the epilogue. Financial support was provided
by the NASA Sun-Earth Connection Program and by an NRL/ONR Accelerated Research
Initiative.