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We revisit a multi-spacecraft study of the element abundances of solarenergetic particles (SEPs) in the 23 January 2012 event, where the power-lawpattern of enhancements versus the mass-to-charge ratio A/Q for the elements Cthrough Fe was partly disrupted by a break near Mg, which turned out to be anunfortunate distraction. In the current article we find that extending thatleast-squares fits for C - Fe down to H at A/Q = 1 lends much more credence tothe power laws, even though H itself was not included in the fits. We alsoinvestigate the extent of an adiabatically invariant "reservoir" ofmagnetically-trapped particles behind the shock wave in this event.

Virtues of Including Hydrogen in the Patterns of Element Abundances in Solar Energetic Particles