Oxygen and iron ions at high heliolatitudes

The fluxes of O and Fe ions at high heliolatitudes measured by the HiScale instrument on Ulysses reflect the dynamical processes that affect the charg ed particle populations in the heliosphere. Both the O and Fe ions show mor e latitude dependence in the first (solar minimum) orbit to high southern h eliolatitudes than during the second (solar maximum) orbit. The ion fluxes are larger during the solar minimum orbit; the flux levels are influenced b y the occurrence of corotating interaction regions. The Fe/O abundance rati os are found to be similar at 1 AU and at high heliolatitudes.