The solar latitude and radial dependence of the anomalous cosmic-ray helium component

Details The solar latitude and radial dependence of the anomalous cosmic-ray helium component The solar latitude and radial dependence of the anomalous cosmic-ray helium component

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227l.147m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 227, Feb. 1, 1979, p. L147-L152.

Astronomy and Astrophysics

Astrophysics

18

Helium, Interplanetary Medium, Solar Cosmic Rays, Solar Wind, Kinetic Energy, Latitude, Pioneer Space Probes, Radial Distribution, Solar Protons

Scientific paper

Observations are presented of the spatial intensity gradients of 11-20-MeV per nucleon anomalous helium made with Pioneer 10 and Pioneer 11 over the radial range 1-11.3 AU for Pioneer 10 and to a heliographic latitude of 16 deg at 3.75 AU for Pioneer 11. Evidence is found for a significant gradient in heliographic latitude, with flux increasing away from the equatorial plane at the rate of about 2% to 3% per degree of latitude. This result shows that the common assumption of spherical symmetry for solar modulation is incorrect. By comparison with gradients measured for 29-67-MeV per nucleon helium and for 11-20-MeV and 29-67-MeV protons, it is found that both the radial and latitudinal gradients of the low-energy anomalous helium are the largest of those measured. The implications of these results for the origin of the anomalous component and for solar modulation are briefly discussed.

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