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

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