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Measurement of anomalous cosmic ray oxygen at heliolatitudes ∼25° to ∼64°
AT&T Bell Laboratories, Murray Hill, NJ
AT&T Bell Laboratories, Murray Hill, NJ
Applied Physics Laboratory, The Johns Hopkins University, Laurel, MD
Department of Physics, University of Kansas, Lawrence
Applied Physics Laboratory, The Johns Hopkins University, Laurel, MD
Applied Physics Laboratory, The Johns Hopkins University, Laurel, MD
University of Birmingham, UK
University of Thrace, Xanthi, Greece
Space Sciences Laboratory, University of California, Berkeley
Observatoire de Paris, Meudon, France
Space Sciences Laboratory, University of California, Berkeley
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 HI‐SCALE low energy particle instrument on the Ulysses spacecraft as the spacecraft climbed from ∼24° to ∼64° south solar heliolatitude during 1993 and early 1994. As a function of heliolatitude, the O abundance at 2–2.8 MeV/nucl drops sharply at latitudes above the heliospheric current sheet. The oxygen spectrum obtained above the current sheet has a broad peak centered at an energy of ∼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 both solar and anomalous origin particles.
Received 22 August 1994; accepted 2 November 1994; .
Citation: (1995), Measurement of anomalous cosmic ray oxygen at heliolatitudes ∼25° to ∼64°, Geophys. Res. Lett., 22(4), 333–336.
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