Observations of 1-6 MeV Jovian electrons at 1 AU and a study of their propagation

Physics

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Electrons, Flux (Rate), Interplanetary Magnetic Fields, Jupiter (Planet), Diffusion Coefficient, Electron Sources, Imp, Radiation Sources, Spectrometers

Scientific paper

The electron/isotope spectrometers on the IMP-7 and IMP-8 satellites measured the non-solar interplanetary electron flux. Eighty-eight Jovian increases, identified in five synodic periods were classified by their time profiles. The fall time profiles were consistent with an exponential fall with tau approximately 4 to 9 days. The rise time profiles displayed a systematic variation over the synodic period. Exponential rise time profiles with tau approximately 1 to 3 days tended to occur in the time period before nominal connection, diffusive profiles predicted by the convention-diffusion model around nominal connection, and abrupt profiles after nominal connection. The electron data were modeled by using a convection-diffusion model of Jovian electron propagation. The synodic envelope formed by the maxima of the Jovian increases was modeled by the envelope formed by the predicted intensities at a time less than that needed to reach equilibrium.

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