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tokens: We thank D. Gurnett for the Voyager wave spectrogram, N. Schwadron for the IBEX Ribbon spectrogram, and J. Harding for preparing Figures 1 , 2 , and 4 . I.H.C. thanks H. Elliott, V. Florinski, D. McComas, D. Melrose, N. Pogorelov, G. Zank, and E. Zirnstein for helpful advice and discussions. He also thanks the University of Sydney for support under its Special Studies Program (SSP), J. LaBelle and G. Zank for hosting his SSP visits to Dartmouth College and the University of Alabama at Huntsville (UAH), respectively, and the staff and colleagues at Dartmouth, UAH, and SwRI for their support and interest during his visits. S.A.F.’s research at SwRI was supported by NASA through the Explorer Program.