Observations of Jovian electrons at 1 AU

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Electron Emission, Jupiter Atmosphere, Planetary Radiation, Solar Activity Effects, Electron Distribution, Interplanetary Magnetic Fields, Pioneer 10 Space Probe, Planetary Magnetospheres, Solar Electrons

Scientific paper

It has recently been suggested that electrons of Jovian origin are responsible for the quiet-time increases in the electron intensity greater than 3 MeV observed at 1 AU. Using data from electron/isotope spectrometers on Imp 7 and 8, the temporal behavior of quiet-time electrons at 1 AU is studied over the period October 1972 through May 1975. The 1- to 6-MeV electron intensity is found to vary by a factor of about 10 from one quiet-time period to another, including numerous short-term enhancements characteristic of the quiet-time increases reported during 1964-1972. The magnitude and frequency of the increases grow abruptly and remain high for an approximate 4-month period beginning with the time at which the interplanetary field line first connects earth and Jupiter. It is suggested that the interconnection of the interplanetary field with an extended Jovian magnetotail of about 2 AU in length could result in the observed longitudinal distribution of Jovian electrons of 1 AU.

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