Physics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....5....1f&link_type=abstract
In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 5 p 1-4 (SEE N85-34991 23-93)
Physics
Anisotropy, Density (Number/Volume), Heliosphere, Solar Cosmic Rays, Solar Cycles, Solar Magnetic Field, Solar Wind, Cerenkov Counters, Pioneer 10 Space Probe, Scattering, Solar Protons, Variations
Scientific paper
Previous studies at lower energies have shown that the cosmic ray density gradients vary in space and time, and many authors currently are suggesting that the radial gradient associated with solar cycle modulation is supported largely by narrow barriers which encircle the Sun and propagate outward with the solar wind. If so, the anisotropy is a desirable way to detect spatial gradients, because it can be associated with the local solar wind and magnetic field conditions. With this in mind, the anisotropy measurements made by the UCSD Cerenkov detectors on Pioneers 10 and 11 are studied. It is shown that the local anisotropy varies greatly, but that the long term average is consistent with the global radial gradient measured between two spacecraft over a baseline of many AU.
Fillius Walker
Huen Ip Wing
Roelof Edmond C.
Smith Edward. J.
Wood David
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