Energetic Neutral Particle Imaging of Saturn'S Magnetosphere

  1. J. H. Waite Jr.,
  2. J. L. Burch and
  3. R. L. Moore
  1. A. F. Cheng and
  2. S. M. Krimigis

Published Online: 18 MAR 2013

DOI: 10.1029/GM054p0253

Solar System Plasma Physics

Solar System Plasma Physics

How to Cite

Cheng, A. F. and Krimigis, S. M. (1989) Energetic Neutral Particle Imaging of Saturn'S Magnetosphere, in Solar System Plasma Physics (eds J. H. Waite, J. L. Burch and R. L. Moore), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM054p0253

Author Information

  1. Applied Physics Laboratory, The Johns Hopkins University, Laurel, MD 20707

Publication History

  1. Published Online: 18 MAR 2013
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780875900742

Online ISBN: 9781118664315



  • Space plasmas;
  • Sun;
  • Magnetosphere;
  • Astrophysics


Energetic charge exchange neutrals have been detected from the magnetospheres of Jupiter and Saturn by the Voyager spacecraft. Imaging of charge exchange neutrals provides information on the global three-dimensional structure and dynamics of the magnetosphere. Analysis of charge exchange neutrals also allows remote sensing of energetic ion composition and energy spectra. Such analyses will address several critical scientific objectives of the proposed Cassini mission to Saturn, including the ring current, radiation belts, potential substorm activity, and magnetosphere-satellite interactions. On the basis of the Voyager observation it is expected that, in addition to the atomic hydrogen of the Titan torus, there is a water product neutral cloud in Saturn's inner magnetosphere. A model for the Titan torus places an upper limit on the H2 density consistent with the Voyager upper limit to the thermal H2 + density. Hence charge exchanges with H2 are likely to be relatively unimportant. The charge exchange neutrals from the Saturn system consist of fast H from the Titan torus region and fast heavy atoms from the inner magnetosphere. Simple estimates are given for instrument sensitivities and required exposure times, and possible results are sketched for neutral particle imaging of the Saturn system.