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GEOPHYSICAL RESEARCH LETTERS, VOL. 22, NO. 23, PAGES 3353–3356, 1995

Anomalous Cosmic Ray Oxygen and Neon (∼2.4 MeV/nucl) at High Southern Heliolatitudes

L. J. Lanzerotti

AT&T Bell Laboratories, Murray Hill.


C. G. Maclennan

AT&T Bell Laboratories, Murray Hill.


Abstract

We report measurements of the anomalous oxygen and neon as measured with the HI-SCALE instrument on Ulysses at high southern heliolatitudes. Using both energy spectral features and C/O ratios, 2.0-2.8 MeV/nucl anomalous O is not distinguishable below a latitude of ∼40°S. The heliolatitude gradient is found to be +0.06 ± 0.50% / degree for the heliolatitude range 40°S to 80°S for an assumed radial gradient of 15% per AU. For the assumption of no radial gradient, the heliolatitude gradient is 0.39 ±0.42% / degree. The O flux at this energy is ∼2×10−8/(cm² sr s MeV/nucl); the Ne flux is ∼5×10−9 /(cm² sr s MeV/nucl).

Received 16 June 1995; accepted 19 October 1995.

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Citation: Lanzerotti, L. J., and C. G. Maclennan (1995), Anomalous Cosmic Ray Oxygen and Neon (∼2.4 MeV/nucl) at High Southern Heliolatitudes, Geophys. Res. Lett., 22(23), 3353–3356.