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Title:
Angular distributions of electrons of energy greater than 0.06 MeV in the Jovian magnetosphere
Authors:
SENTMAN, D. D.; VAN ALLEN, J. A.
Affiliation:
AB(Iowa, University, Iowa City, Iowa)
Journal:
Journal of Geophysical Research, vol. 81, Mar. 1, 1976, p. 1350-1360.
Publication Date:
03/1976
Category:
Lunar and Planetary Exploration
Origin:
STI
NASA/STI Keywords:
ELECTRON DENSITY PROFILES, JUPITER ATMOSPHERE, MAGNETOSPHERIC ELECTRON DENSITY, PLANETARY MAGNETOSPHERES, RADIATION BELTS, ANGULAR DISTRIBUTION, ASTRONOMICAL MODELS, PIONEER 10 SPACE PROBE, PITCH (INCLINATION), RADIATION COUNTERS
Bibliographic Code:
1976JGR....81.1350S

Abstract

Measurements of the angular distribution of electron intensity in the Jupiter magnetosphere were made by the University of Iowa experiment on Pioneer 10. The data were from three directional particle detectors with effective integral threshold of 0.06, 0.55 and 0.5 MeV respectively. It was discovered that the central core of the magnetosphere for radial distances less than 12 Jovian radii is dominated by pitch angle distributions strongly peaked at alpha = 90 degrees, while the region of radial distances 12-25 Jovian radii shows bidirectional and approximately equal maxima at alpha = 0 and 180 degrees. Substantial field-aligned streaming was detected on two occasions, each of about 1 hour duration. No distinctive effects on angular distributions were observed near the L shells of satellites.

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