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Charge states of energetic ions in Jupiter’s radiation belt inferred from absorption microsignatures of Io

Selesnick, R. S. and Cohen, C. M. S. (2009) Charge states of energetic ions in Jupiter’s radiation belt inferred from absorption microsignatures of Io. Journal of Geophysical Research A, 114 (A01207). pp. 1-10. ISSN 0148-0227. doi:10.1029/2008JA013722.

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The Heavy Ion Counter on the Galileo Jupiter orbiter observed depletions of energetic (≳5 MeV/nucleon) oxygen and sulfur ions near Io that are interpreted as absorption microsignatures. The two elements were equally abundant in this region of Jupiter’s radiation belt. Numerical simulations of microsignatures from Galileo orbits 27, 31, and 32, based on calculations of ion trajectories in models of the magnetospheric and Alfvén wing magnetic fields, show that the data are most consistent with the ions being fully ionized or nearly so. The conclusion is independent of field model inaccuracies, which cause some discrepancy between simulations and data, because the Alfvén wing field significantly deflects only those trajectories with relatively small gyroradii.

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Cohen, C. M. S.0000-0002-0978-8127
Additional Information:© 2009 American Geophysical Union. Received 3 September 2008; revised 4 November 2008; accepted 10 November 2008; published 15 January 2009. This work was supported by NASA grant NNX06AB41G. Wolfgang Baumjohann thanks the reviewers for their assistance in evaluating this paper.
Group:Space Radiation Laboratory
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Subject Keywords:solar wind; turbulence
Issue or Number:A01207
Record Number:CaltechAUTHORS:SELjgra09a
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13449
Deposited On:22 Apr 2009 22:50
Last Modified:08 Nov 2021 22:37

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