CIR Associated Energetic Particles in the Inner and Middle Heliosphere |
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Authors: | GM Mason TR Sanderson |
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Institution: | (1) Department of Physics and IPST, University of Maryland, College Park, Maryland, USA;(2) Space Sciencer Department of ESA ESTEC, 2200 AG Noordwijk, The Netherlands |
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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.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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