Particle Acceleration at the Termination Shock: Voyager 1 and 2 Observations

Astronomy and Astrophysics – Astrophysics

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Astronomical Observations, Planetary Bow Shocks, Interplanetary Shocks, Particle Acceleration, Heliopause And Solar Wind Termination, Magnetohydrodynamics And Plasmas, Interplanetary Magnetic Fields, Flares, Abundances, Chemical Composition

Scientific paper

We compare Voyager 1 (V1) and 2 (V2) low-energy (~0.03-4.0 MeV) ion intensities averaged over selected periods before and after encounters with the termination shock (TS). Comparisons made during three successive 78-day periods immediately behind the TS show marked evolution of intensities and spectral indices that differ at V1 and V2. By the third 78-day period, absolute intensities and spectral forms are comparable at V1 and V2, and the differential intensities are well fit by power laws with indices -1.53+/-0.03 and -1.41+/-0.04 respectively.

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