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AGU: Geophysical Research Letters

 

Index Terms

  • Magnetospheric Physics: Energetic particles: trapped
  • Magnetospheric Physics: Magnetospheric configuration and dynamics
  • Magnetospheric Physics: Planetary magnetospheres
  • Magnetospheric Physics: Magnetic storms and substorms
  • Planetary Sciences: Fluid Planets: Magnetospheres

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 32, L14S05, 5 PP., 2005
doi:10.1029/2005GL022485

Energetic particle injections in Saturn's magnetosphere

B. H. Mauk

Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, USA

J. Saur

Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, USA

D. G. Mitchell

Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, USA

E. C. Roelof

Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, USA

P. C. Brandt

Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, USA

T. P. Armstrong

Fundamental Technologies, Lawrence, Kansas, USA

D. C. Hamilton

Department of Physics, University of Maryland, College Park, Maryland, USA

S. M. Krimigis

Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, USA

N. Krupp

Max-Planck Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany

S. A. Livi

Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, USA

J. W. Manweiler

Fundamental Technologies, Lawrence, Kansas, USA

C. P. Paranicas

Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, USA

Measurements from the Cassini Magnetospheric Imaging Instrument (MIMI) beginning in July 2004 reveal that sudden planetward injections of energetic ions (5–200 keV) and electrons (20–200 keV) over confined regions of azimuth are pervasive events in Saturn's magnetosphere over the radial range of 3.8 to 11.2 Saturn radii (RS). Saturn is thus similar to both Earth and Jupiter in the pervasiveness of such injections. At Saturn with Cassini, unlike Jupiter with Galileo, effects of the large radial gradients in the global azimuthal rotational flow pattern often dominates the dispersive particle injection signatures. Accurate knowledge of rotational flow patterns is required to calculate the age and formation positions of injections that are more than several hours old. Here we develop procedures to derive the needed flow profiles from the injections themselves.

Received 19 January 2005; accepted 4 March 2005; published 11 June 2005.

Citation: Mauk, B. H., et al. (2005), Energetic particle injections in Saturn's magnetosphere, Geophys. Res. Lett., 32, L14S05, doi:10.1029/2005GL022485.

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