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Energetic ion observations in the middle Jovian magnetosphere

Cohen, C. M. S. and Stone, E. C. and Selesnick, R. S. (2001) Energetic ion observations in the middle Jovian magnetosphere. Journal of Geophysical Research A, 106 (A12). pp. 29871-29881. ISSN 0148-0227. doi:10.1029/2001JA000008.

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The middle magnetosphere of Jupiter has not been well studied prior to the Galileo mission. This region (10–30 R_J) has been traversed by Galileo numerous times allowing spatial and temporal features to be differentiated. We present observations of energetic ions (E ∼4.5–18.4 MeV nucleon^(−1)) in the middle Jovian magnetosphere obtained with the Heavy Ion Counter (HIC) on Galileo. The radial dependence of the intensity, spectrum, and composition of these particles indicates that solar material dominates the 15 to 30 R_J region and diffuses without loss toward Jupiter. Near 10 R_J the composition is more Iogenic and shows evidence of strong losses. These observations can be understood in terms of a common energy per charge spectrum for all heavy ions. Due to the substantially different charge to mass ratios of the Iogenic and solar ions, the O/C and S/C abundance ratios vary with magnetic moment and therefore radial distance when observed over the fixed energy interval of the HIC instrument. Near 25 R_J there is evidence of acceleration of ions to MeV nucleon^(−1) energies. The location of this acceleration has been suggested previously but not directly observed before the Galileo mission.

Item Type:Article
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URLURL TypeDescription DOIArticle
Cohen, C. M. S.0000-0002-0978-8127
Stone, E. C.0000-0002-2010-5462
Additional Information:© 2001 by the American Geophysical Union. Received January 10, 2001; revised August 24, 2001; accepted August 27, 2001. We thank the magnetometer team for making their data available to us. This work was supported by NASA grant NAG58634 under the Jovian System Data Analysis Program. Janet G. Luhmann thanks the referees for their assistance in evaluating this paper.
Group:Space Radiation Laboratory
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2001-37
Issue or Number:A12
Record Number:CaltechAUTHORS:20140305-084009947
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Official Citation:Cohen, C. M. S., E. C. Stone, and R. S. Selesnick (2001), Energetic ion observations in the middle Jovian magnetosphere, J. Geophys. Res., 106(A12), 29871–29881, doi:10.1029/2001JA000008
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44145
Deposited By: Tony Diaz
Deposited On:05 Mar 2014 19:10
Last Modified:10 Nov 2021 16:48

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