Physics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29g..35v&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 7, pp. 35-1, CiteID 1131, DOI 10.1029/2001GL014099
Physics
Interplanetary Physics: Cosmic Rays, Interplanetary Physics: Heliopause And Solar Wind Termination, Interplanetary Physics: Solar Cycle Variations (7536)
Scientific paper
Instruments on Pioneer 10, Voyager 1 and Voyager 2 measure galactic cosmic ray intensity (>80 MeV/nucleon) as the spacecraft move along their solar system escape trajectories. As of 1 June 2001, their respective heliocentric radial distances were 78 AU (in approximately the antapex direction from the Sun), 81 AU and 64 AU (the latter two in approximately the apex direction). The principal finding of this paper is that all three spacecraft were still under the delayed influence of increasing solar activity during cycle 23 and were, therefore, inside the modulation boundary of the heliosphere. Also the combined evidence favors essential antapex-apex symmetry in the large scale modulation medium. The contents of this paper are generally concordant with studies by other groups of authors but are unique in the inclusion of the recent four years of antapex data from Pioneer 10.
Van Allen James A.
Webber William R.
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