Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...148l...5k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 148, no. 1, July 1985, p. L5-L7. Research supported by the Minerva Foundation.
Astronomy and Astrophysics
Astrophysics
Pioneer 10 Space Probe, Pioneer 11 Space Probe, Proton Flux Density, Solar Protons, Solar Wind Velocity, Momentum, Radial Distribution, Solar Activity Effects
Scientific paper
Recently published Pioneer 10 and Pioneer 11 observations are discussed. It is shown that the normalized momentum flux density of the solar wind protons is constant up to heliocentric distance 8.3-8.4 A.U. and its value is approximately equal to the observed values of other spacecraft at 0.3-1.0 A.U. This result strengthens also the previous suggestion that the momentum flux density is invariant relative to the solar activity cycle. A sudden and sharp increase in the normalized flux density of 40 percent-50 percent is observed by both spacecraft at 8.3-8.4 A.U. The nature of this increase is discussed.
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