OVER THE SOUTHERN SOLAR POLE - LOW-ENERGY INTERPLANETARY CHARGED-PARTICLES

The heliosphere instrument for spectrum, composition, and anisotropy ( HISCALE) recorded the fluxes of low-energy ions and electrons (>50 kil oelectron volts) when Ulysses crossed the southern solar polar region and revealed that the large-scale structure of the heliosphere to at l east similar to-75 degrees was significantly influenced by the near-eq uatorial heliospheric current sheet. Electrons in particular were acce lerated by the current sheet-produced and poleward-propagating interpl anetary reverse shock at helioradii far from the Ulysses location. At heliolatitudes higher than similar to-75 degrees on the Ulysses ascent to the pole and similar to-50 degrees on the descent, small, less reg ular enhancements of the lowest energy electron fluxes were measured w hose relations to the current sheet were less clear. The anomalous com ponent of low-energy (similar to 2 to 5 megaelectron volts per nucleon ) oxygen flux at the highest heliolatitudes was found to be similar to 10(-8) [per square centimeter per second per steradian (per kiloelect ronvolt per nucleon)]; the anomalous Ne/O ratio was similar to 0.25.