Abstract
Energetic particles associated with Corotating Interaction Regions (CIRs) are observed throughout the inner and middle heliosphere, showing large positive (>100%/AU) radial intensity gradients. Their appearance at 1 AU is associated with the appearance of fast, recurrent solar wind streams. At several AU, CIR energetic particles are accelerated at shocks which propagate away from the interface of fast and slow solar wind streams. CIR energy spectra at 1 AU cover the range > 35 keV to several MeV/amu; the spectra steepen above ~1 MeV/amu, and show no turnover even at the lowest energies. The ion composition of CIRs is similar to solar material, but with significant differences that might be due to properties of the seed population and/or the acceleration process. This paper summarizes properties of energetic particles in CIRs as known through the early 1990s, prior to the launch of the Ulysses, and WIND spacecraft, whose new results are presented in Kunow, Lee et al. (1999) in this volume.
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Mason, G.M., Sanderson, T.R. (1999). CIR Associated Energetic Particles in the Inner and Middle Heliosphere. In: Balogh, A., Gosling, J.T., Jokipii, J.R., Kallenbach, R., Kunow, H. (eds) Corotating Interaction Regions. Space Sciences Series of ISSI, vol 7. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1179-1_6
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DOI: https://doi.org/10.1007/978-94-017-1179-1_6
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