Voyager observations of low-energy ions during solar cycle 23 Original Research Article

We report on observations at Voyagers 1 and 2, in the outer heliosphere, of ions with energies ∼30 keV to 30 MeV. The period of interest is from 2001 through 2002 DOY 268, during which both spacecraft observe significant variations in energetic ion intensities as large-scale plasma disturbances associated with intense periods of solar activity in 2000–2002 reach the outer heliosphere.