Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published August 10, 2005 | Supplemental Material + Published
Journal Article Open

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


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.

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.

Attached Files

Published - jgra17869.pdf

Supplemental Material - jgra17869-sup-0001-t01.txt

Supplemental Material - jgra17869-sup-0002-t02.txt

Supplemental Material - jgra17869-sup-0003-t03.txt

Supplemental Material - jgra17869-sup-0004-t04.txt

Supplemental Material - jgra17869-sup-0005-t05.txt


Files (1.3 MB)
Name Size Download all
544 Bytes Preview Download
215 Bytes Preview Download
678 Bytes Preview Download
1.3 MB Preview Download
496 Bytes Preview Download
92 Bytes Preview Download

Additional details

August 19, 2023
October 26, 2023