Abstract

The particle population in the heliosphere is briefly reviewed. Next the chemical composition of the charged fraction is reviewed by discussing three classes. The galactic cosmic rays and high energy solar flare particles above 100 MeV/nucleon are mentioned. The anomalous component in the range 1-100 MeV/nucleon, prompt solar flare particles, energetic storm particles and corotating events are discussed. The anomalous variations in isotopic ( 3 He) and chemical composition (iron-rich events) at energies below 10 MeV are reviewed. A discussion on the ionic charge state of these particles concludes this overview.

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