Latitudinal and radial gradients of anomalous and galactic cosmic rays in the outer heliosphere

Details Latitudinal and radial gradients of anomalous and galactic cosmic rays in the outer heliosphere Latitudinal and radial gradients of anomalous and galactic cosmic rays in the outer heliosphere

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..174c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, March 1987, p. 174-177.

Physics

46

Galactic Cosmic Rays, Heliosphere, Radial Distribution, Radiation Distribution, Solar Cycles, Oxygen Spectra, Pioneer 10 Space Probe, Plasma Drift, Voyager Project

Scientific paper

Measurements from instruments on Voyagers 1 and 2 and Pioneer 10 are used to derive simultaneous radial and latitudinal gradients of anomalous cosmic-ray oxygen during the latter part of 1985. It is found that in the energy interval from 7.1-30.6 MeV/nucleon the latitudinal gradient is -3 to -4 percent/deg. The sign of the latitudinal gradient is opposite to that reported for the last solar cycle when the solar magnetic field polarity was reversed, as predicted by propagation models in which curvature and gradient drifts are significant. The ratios of the radial and latitudinal gradients of anomalous oxygen, anomalous helium, and galactic cosmic rays are similar, also in agreement with drift theory predictions. Based on drift theory, these observed ratios, which are near unity, lead to estimates of the perpendicular diffusion coefficient/particle velocity ratio in the range 3-8 x 10 to the 22nd sq cm/sec at 24.9 AU for particles with rigidities of about 2-3 GV.

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