Jovian electrons at 1 AU - 1978-1984

Abstract

Observations of 5 - 30 MeV Jovian electrons from 1978 to 1984 have been made at 1 AU by the University of Chicago electron spectrometer onboard the ISEE 3 spacecraft. The six consecutive 13 month Jovian synodic periods covered by these observations span the interval of maximum solar activity. The 13 month variation in the Jovian electron intensity measured by ISEE 3 continues to be well described by the convection-diffusion model used by Conlon and Chenette to understand propagation of Jovian electrons observed by IMP 8 during a time of lower solar activity. Short-term intensity variations are attributed to short-term changes in the degree of magnetic connection between the spacecraft and Jupiter. The energy spectrum of Jovian electrons is discussed in detail and the effect of adiabatic deceleration on the shape of the spectrum is studied.