Modulation of Jovian electron intensity in interplanetary space by corotating interaction regions

Details Modulation of Jovian electron intensity in interplanetary space by corotating interaction regions Modulation of Jovian electron intensity in interplanetary space by corotating interaction regions

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...211l..45c&link_type=abstract

Astrophysical Journal, vol. 211, Jan. 1, 1977, pt. 2, p. L45-L49.

Astronomy and Astrophysics

Astrophysics

13

Electron Flux Density, Interplanetary Magnetic Fields, Interplanetary Space, Jupiter (Planet), Planetary Radiation, Electron Emission, High Energy Electrons, Particle Acceleration, Relativistic Particles, Solar Activity Effects, Solar Wind Velocity

Scientific paper

Large-scale intensity variations of Jovian electrons in the energy range from 3 to 6 MeV persisting for several days were observed with instrumentation on the Pioneer 10 and Pioneer 11 spacecraft out to several AU from Jupiter along the pre- and post-planetary encounter trajectories. The corotating interaction regions (CIRs), found by Smith and Wolfe (1976) on these missions to be approximately 25-day recurring regions of enhanced magnetic fields bounded by jumps in solar-wind velocity and frequently shocks, are shown to be impenetrable 'barriers' for the Jovian electrons propagating in the interplanetary medium. Thus, the principal electron-intensity variations are due to the modulating effects of CIRs and are not due to either variations in escape rate of electrons from the magnetosphere or interplanetary electron acceleration. The implications for electron observations at the orbit of earth are discussed.

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