tokens: We thank K. Dalmasse, S. Guidoni, A. Higginson, S. Masson, and K. Muglach for illuminating discussions and helpful suggestions, and we greatly appreciate J. Karpen's contribution of the artwork shown in Figure 1 . K.J.K. acknowledges support for this work by a cooperative agreement between the Catholic University of America and the NASA Goddard Space Flight Center, as well as additional funding received through the NASA Earth and Space Science Fellowship program. The participation of S.KA. and C.R.D. was sponsored by NASA's Heliophysics Theory and Supporting Research programs. The numerical simulations were supported by a grant of NASA High End Computing resources to C.R.D.
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