Abundances and Energy Spectra of Corotating Interaction Region Heavy Ions

Details Abundances and Energy Spectra of Corotating Interaction Region Heavy Ions Abundances and Energy Spectra of Corotating Interaction Region Heavy Ions

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1039..101m&link_type=abstract

PARTICLE ACCELERATION AND TRANSPORT IN THE HELIOSPHERE AND BEYOND: 7th Annual International Astrophysics Conference. AIP Confer

Computer Science

Databases

Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc., Astronomical Observations, Particle Emission, Solar Wind, Flares, Particle Acceleration, Abundances, Chemical Composition, Magnetohydrodynamics And Plasmas, Turbulence

Scientific paper

We have surveyed He-Fe spectra for 41 Corotating Interaction Regions (CIRs) from 1998-2007 observed on ACE. The spectra are similar for all species, and have the form of broken power laws with the spectral break occurring at a few MeV/nucleon. Except for overabundances of He and Ne, the abundances are close to those of the solar wind. We find the rare isotope 3He is enhanced in ~40% of the events. In individual CIRs the Fe/O ratio correlates strongly with the solar wind Fe/O ratio measured 2-4 days prior to the CIR passage. Taken together with previously reported observations of pick-up He+ in CIRs, these observations provide evidence that CIRs are accelerated out of a suprathermal ion pool of heated solar wind ions, pick-up ions, and remnant suprathermal ions from impulsive solar energetic particle (SEP) events.

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