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Science 25 January 1974:
Vol. 183. no. 4122, pp. 306 - 309
DOI: 10.1126/science.183.4122.306
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Articles
Protons and Electrons in Jupiter's Magnetic Field: Results from the University of Chicago Experiment on Pioneer 10
J. A. Simpson 1,
D. Hamilton 1,
G. Lentz 1,
R. B. McKibben 1,
A. Mogro-Campero 1,
M. Perkins 1,
K. R. Pyle 1,
A. J. Tuzzolino 1, and
J. J. O'Gallagher 2
1 Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637
2 Department of Physics and Astronomy, University of Maryland, College Park 20742
Fluxes of high energy electrons and protons are found to be highly concentrated near the magnetic equatorial plane from distances of ~ 30 to ~ 100 Jovian radii (RJ). The 10-hour period of planetary rotation is observed as an intensity variation, which indicates that the equatorial zone of high particle fluxes is inclined with respect to the rotation axis of the planet. At radial distances [unknown] 20 RJ the synchrotron-radiation-producing electrons with energies  3 million electron volts rise steeply to a maximum intensity of ~ 5 x 108 electrons per square centimeter per second near the periapsis at 2.8 RJ. The flux of protons with energies 30 million electron volts reaches a maximum intensity of ~ 4 x 106 protons per square centimeter per second at ~ 3.5 RJ with the intensity decreasing inside this radial distance. Only for radial distances [unknown] 20 RJ does the radiation behave in a manner which is similar to that at the earth. Burst of electrons with energies up to 30 million electron volts, each lasting about 2 days, were observed in interplanetary space beginning approximately 1 month before encounter. This radiation appears to have escaped from the Jovian bow shock or magnetosphere.
THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
- Erosion of Galilean Satellite Surfaces by Jovian Magnetosphere Particles.
- R. E. Johnson, R. E. JOHNSON, L. J. LANZEROTTI, W. L. BROWN, and T. P. ARMSTRONG (1981)
Science
212, 1027-1030
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- Saturnian Trapped Radiation and Its Absorption by Satellites and Rings: The First Results from Pioneer 11.
- J. A. SIMPSON, T. S. BASTIAN, D. L. CHENETTE, G. A. LENTZ, R. B. MCKIBBEN, K. R. PYLE, and A. J. TUZZOLINO (1980)
Science
207, 411-415
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- Hot Plasma Environment at Jupiter: Voyager 2 Results.
- S. M. KRIMIGIS, T. P. ARMSTRONG, W. I. AXFORD, C. O. BOSTROM, C. Y. FAN, G. GLOECKLER, L. J. LANZEROTTI, E. P. KEATH, R. D. ZWICKL, J. F. CARBARY, et al. (1979)
Science
206, 977-984
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- Low-Energy Charged Particle Environment at Jupiter: A First Look.
- S. M. KRIMIGIS, T. P. ARMSTRONG, W. I. AXFORD, C. O. BOSTROM, C. Y. FAN, G. GLOECKLER, L. J. LANZEROTTI, E. P. KEATH, R. D. ZWICKL, J. F. CARBARY, et al. (1979)
Science
204, 998-1003
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- Jupiter Revisited: First Results from the University of Chicago Charged Particle Experiment on Pioneer 11.
- J. A. Simpson, J. A. Simpson, D. C. Hamilton, G. A. Lentz, R. B. McKibben, M. Perkins, K. R. Pyle, A. J. Tuzzolino, and J. J. O'Gallagher (1975)
Science
188, 455-459
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- Pioneer 10 Jovian Encounter: Radiation Dose and Implications for Biological Lethality.
- M. W. Miller, M. W. Miller, G. E. Kaufman, and H. D. Maillie (1975)
Science
187, 738-739
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- Io: A Surface Evaporite Deposit?.
- F. P. Fanale, F. P. Fanale, T. V. Johnson, and D. L. Matson (1974)
Science
186, 922-925
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- Search by Mariner 10 for Electrons and Protons Accelerated in Association with Venus.
- J. A. Simpson, J. A. Simpson, J. H. Eraker, J. E. Lamport, and P. H. Walpole (1974)
Science
183, 1318-1321
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