The fluxes of anomalous oxygen (<i>E</i> ranging from 3.5-6.8 MeV/amu), as measured by the EPAC instrument on ULYSSES, show a recurrent variation with the solar rotation period, Fabric Refreshers which is anticorrelated with the fluxes of particles accelerated at the shocks of a corotating interaction region (CIR), and correlated with the fluxes LC of galactic cosmic rays known to be modulated by the CIR.
The amplitude of this variation is much higher than expected for galactic cosmic rays of the same rigidity.