Pioneer 11 observations of trapped particle absorption by the Jovian ring and the satellites 1979, J1, J2, and J3

Journal Article · Sat Jan 01 00:00:00 EST 1983 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA088iA01p00045· OSTI ID:6079783

Pyle, K R; McKibben, R B; Simpson, J A

Pioneer 10 and 11, during their encounters with Jupiter in 1973 and 1974, penetrated to L values of 2.8 and 1.7, respectively. During these encounters, at several L values, decreases in the intensity of energetic trapped particles were observed, some of which could be explained as due to absorption by the known moons Io and Amalthea; however, some decreases inside L = 4 could not be explained. The recent Voyager 1 and 2 optical discoveries of several new moons and a ring in this region has led us to reexamine our particle data, and we summarize results in this report. We report observations in three channels: protons 0.5--8.7 MeV; electrons >3.4 MeV; and medium-Z nuclei, probably oxygen and sulfur >70 MeV/nucleon. We find that with the additional moons and the ring, all observed intensity features in the stably trapped radiation are accounted for by satellite and ring absorption.

• Research Organization: Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637
• OSTI ID: 6079783
• Journal Information: J. Geophys. Res.; (United States), Vol. 88:A1
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
JUPITER PLANET
PLANETARY MAGNETOSPHERES
OXYGEN
PIONEER SPACE PROBES
RINGS
SATELLITE ATMOSPHERES
SULFUR
TRAPPED ELECTRONS
TRAPPED PROTONS
ATMOSPHERES
BARYONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
HADRONS
LEPTONS
NONMETALS
NUCLEONS
PLANETARY ATMOSPHERES
PLANETS
PROTONS
SPACE VEHICLES
VEHICLES
640107* - Astrophysics & Cosmology- Planetary Phenomena