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Heavy ion abundances and spectra from the large solar energetic particle events of October-November 2003

Cohen, C. M. S. and Stone, E. C. and Mewaldt, R. A. and Leske, R. A. and Cummings, A. C. and Mason, G. M. and Desai, M. I. and von Rosenvinge, T. T. and Wiedenbeck, M. E. (2005) Heavy ion abundances and spectra from the large solar energetic particle events of October-November 2003. Journal of Geophysical Research A, 110 (A9). Art. No. A09S16. ISSN 0148-0227. https://resolver.caltech.edu/CaltechAUTHORS:20140407-101736587

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Abstract

Observations from the Solar Isotope Spectrometer and the Ultra Low Energy Isotope Spectrometer on the ACE spacecraft during the extremely large events of October and November 2003 are combined to create heavy ion spectra over more than 3 decades in energy. The resulting spectra differed substantially in shape from event to event, as well as from element to element within a given event, resulting in energy-dependent abundance ratios. Although the effects of strong local shock acceleration are apparent in the intensities of the 28 and 29 October events, these do not explain the order of magnitude differences between the event-integrated abundances obtained at 0.64–0.91 MeV/nucleon and those at 12–60 MeV/nucleon. The higher-energy abundances relative to the lower-energy ones show trends with nuclear charge or charge-to-mass ratio that are similar for all the events and suggest that heavier ions are less efficiently accelerated to high energies. The position of the breaks in the energy spectra of O, Ne, Mg, Si, S, Ca, and Fe can be understood in terms of leakage from the shock region, if the mean free path is assumed to be a power law in rigidity. The resulting rigidity dependence is consistent with a source of wave turbulence in the vicinity of the shock when the ions are accelerated.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2005JA011004 DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/2005JA011004/abstractPublisherArticle
ORCID:
AuthorORCID
Cohen, C. M. S.0000-0002-0978-8127
Stone, E. C.0000-0002-2010-5462
Mewaldt, R. A.0000-0003-2178-9111
Leske, R. A.0000-0002-0156-2414
Cummings, A. C.0000-0002-3840-7696
Mason, G. M.0000-0003-2169-9618
Desai, M. I.0000-0002-7318-6008
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:© 2005 by the American Geophysical Union. Received 4 January 2005; revised 27 April 2005; accepted 9 May 2005; published 10 August 2005. This work was supported by NASA at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, NASA Goddard Space Flight Center, and in part under Caltech grant 44A1055749 at the University of Maryland. Arthur Richmond thanks Eberhard S. Moebius and another reviewer for their assistance in evaluating this paper.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANAG5-6912
JPLUNSPECIFIED
NASA Goddard Space Flight CenterUNSPECIFIED
Caltech44A1055749
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2005-06
Issue or Number:A9
Record Number:CaltechAUTHORS:20140407-101736587
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140407-101736587
Official Citation:Cohen, C. M. S., E. C. Stone, R. A. Mewaldt, R. A. Leske, A. C. Cummings, G. M. Mason, M. I. Desai, T. T. von Rosenvinge, and M. E. Wiedenbeck (2005), Heavy ion abundances and spectra from the large solar energetic particle events of October–November 2003, J. Geophys. Res., 110, A09S16, doi:10.1029/2005JA011004
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44686
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Apr 2014 22:54
Last Modified:09 Mar 2020 13:19

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