Solar-heliospheric energetic particles - what do they teach us about galactic cosmic rays?

Physics

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Scientific paper

The heliosphere is the only region of the universe where direct, in situ measurements of energetic particles have been done. In addition to modulating galactic cosmic rays (CRs), the heliosphere also incorporates several accelerators, both in the vicinity of the Sun and at quasi-stationary and moving plasma boundaries, including the termination shock of the supersonic solar wind. Some of those accelerators can be studied both in situ and by remote sensing (such as planetary, CME and CIR shocks), while others (solar flares, the termination shock) are still only remotely accessible, although in much more spatial and temporal detail than any stellar or interstellar source. Plasma and wave observations, phase space distributions of energetic particle populations and electromagnetic signatures are also relevant to CR acceleration. Recent advances in the injection, acceleration and propagation of solar-heliospheric energetic particle populations will be reviewed, mainly based on IMP-8, Voyager, Ulysses, Wind and ACE data, and tentatively compared with processes thought to take place in some of the CR sources.

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