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Abundances and energy spectra of corotating interaction region heavy ions

Mason, G. M. and Leske, R. A. and Desai, M. I. and Dwyer, J. R. and Mazur, J. E. and Mewaldt, R. A. and Gold, R. E. and Krimigis, S. M. (2008) Abundances and energy spectra of corotating interaction region heavy ions. In: Particle acceleration and transport in the heliosphere and beyond: 7th Annual International Astrophysics Conference. AIP Conference Proceedings. No.1039. American Institute of Physics , Melville, NY, pp. 101-110. ISBN 978-0-7354-0566-0.

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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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Mason, G. M.0000-0003-2169-9618
Leske, R. A.0000-0002-0156-2414
Desai, M. I.0000-0002-7318-6008
Mewaldt, R. A.0000-0003-2178-9111
Krimigis, S. M.0000-0003-2781-2386
Additional Information:© 2008 American Institute of Physics. This work was supported in part by NASA under grant NNG04GJ51G at the Johns Hopkins University/Applied Physics Laboratory. We thank the following organizations for permission to publish copyrighted material: American Geophysical Union (Fig. 1, from [1]); and American Astronomical Society (Figs. 2-9, from [7]).
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:interplanetary matter; solar cosmic ray particles; solar spectra; solar wind
Series Name:AIP Conference Proceedings
Issue or Number:1039
Classification Code:PACS: 96.50.-e, 96.50.Pw, 96.50.Qx, 96.50.Vg, 96.50.Ya
Record Number:CaltechAUTHORS:20090521-083239908
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14283
Deposited By: Tony Diaz
Deposited On:26 Aug 2009 21:53
Last Modified:08 Nov 2021 23:10

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