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Acceleration of protons at 32 Jovian radii in the outer magnetosphere of jupiterDuring the inbound pass of Pioneer 10, a rapid ten-fold increase of the 0.2 to MeV proton flux was observed at 32 Jovian radii (R sub J). The total event lasted for 30 minutes and was made up of a number of superimposed individual events. At the time, the spacecraft was in the outer magnetosphere about 7 R sub J below the magnetic equator. Before and after the event, the proton flux was characteristic of the low flux level normally encountered between crossings of the magnetic equator. Flux changes at different energies were coherent within 1 minute; a time comparable to the time resolution of the data. The angular distributions were highly anisotropic with protons streaming towards Jupiter. A field-aligned dumbbell distribution was observed initially, and a pancake distribution just before the flux decayed to its pre-event value. The alpha particle flux changed as rapidly as the proton flux but peaked at different times. The energetic electron flux behaved differently; it increased gradually throughout the period.
Document ID
19780003048
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Schardt, A. W. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mcdonald, F. B. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Trainor, J. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 3, 2013
Publication Date
September 1, 1977
Subject Category
Lunar And Planetary Exploration
Report/Patent Number
NASA-TM-X-71410
X-660-77-225
Accession Number
78N10991
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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