Measurement of anomalous cosmic ray oxygen at heliolatitudes approximately 25 deg to approximately 64 deg

Details Measurement of anomalous cosmic ray oxygen at heliolatitudes approximately 25 deg to approximately 64 deg Measurement of anomalous cosmic ray oxygen at heliolatitudes approximately 25 deg to approximately 64 deg

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..333l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 4, p. 333-336

Astronomy and Astrophysics

Astronomy

2

Abundance, Anomalies, Atomic Spectra, Cosmic Rays, Flux (Rate), Heliosphere, Interplanetary Medium, Oxygen, Astronomical Spectroscopy, Solar Wind, Ulysses Mission

Scientific paper

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 Heliosphere Instrument for Spectra, Composition, and Anisotropy at Low Energies (HI-SCALE) low energy particle instrument on the Ulysses spacecraft as the spacecraft climbed from approximately 24 deg to approximately 64 deg 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 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 both solar and anomalous origin particles.

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