MEASUREMENT OF ANOMALOUS COSMIC-RAY OXYGEN AT HELIOLATITUDES SIMILAR-TO-25-DEGREES TO SIMILAR-TO-64-DEGREES

We report measurements of the oxygen component (0.5 - 22 MeV/nucl) of the interplanetary cosmic ray flux as a function of heliolatitude. The measurements reported here were made with the Wart telescope of the H I-SCALE low energy particle instrument on the Ulysses spacecraft as th e spacecraft climbed from approximately 24-degrees to approximately 64 -degrees south solar heliolatitude during 1993 and early 1994. As a fu nction of heliolatitude, the O abundance at 2-2.8 MeV/nucl drops sharp ly at latitudes above the heliospheric current sheet. The oxygen spect rum obtained above the current sheet has a broad peak centered at an e nergy of approximately 2.5 MeV/nucl that is the anomalous O component at these latitudes. There is little evidence for a latitude dependence in the anomalous O fluxes as measured above the current sheet. Within the heliospheric current sheet, the O measurements are composed of bo th solar and anomalous origin particles.