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Characteristic signatures of energetic ions upstream from the Kronian magnetosphere as revealed by Cassini/MIMI

Published online by Cambridge University Press:  01 September 2008

Olga E. Malandraki ,
S. M. Krimigis ,
E. T. Sarris ,
N. Sergis ,
K. Dialynas ,
D. G. Mitchell ,
D. C. Hamilton  and
A. Geranios
Olga E. Malandraki
Affiliation:
Institute for Astronomy and Astrophysics, National Observatory of Athens, Pedeli, Athens, Greece email: omaland@astro.noa.gr
S. M. Krimigis
Affiliation:
Office for Space Research and Technology, Academy of Athens, Athens, Greece Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, USA
E. T. Sarris
Affiliation:
Democritus University of Thrace, Xanthi, Greece
N. Sergis
Affiliation:
Office for Space Research and Technology, Academy of Athens, Athens, Greece
K. Dialynas
Affiliation:
Office for Space Research and Technology, Academy of Athens, Athens, Greece
D. G. Mitchell
Affiliation:
Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, USA
D. C. Hamilton
Affiliation:
University of Maryland, Department of Physics and Astronomy, MD, USA
A. Geranios
Affiliation:
Nuclear and Particle Physics Department, University of Athens, Greece
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Abstract

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We present unique observations obtained by the Magnetospheric Imaging Instrument (MIMI) on the Cassini spacecraft, of the energetic ion population in the environment upstream from the dawn-to-noon sector of the Kronian magnetosphere during the approach phase and subsequent several orbits of the Cassini spacecraft around the planet. High sensitivity observations of energetic ion directional intensities, energy spectra, and ion composition were obtained by the Ion and Neutral Camera (INCA) of the MIMI instrument complement with a geometry factor of ~2.5 cm2sr. Charge state information was provided by the Charge-Energy-Mass-Spectrometer (CHEMS) over the range ~3 to 220 keV per charge. The observations revealed the presence of distinct upstream bursts of energetic hydrogen and oxygen ions up to distances of ~135 RS. The observations are presented and their theoretical implications are addressed.

Keywords

planets and satellites: generalacceleration of particlesplasmas
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S257: Universal Heliophysical Processes , September 2008 , pp. 517 - 522
Copyright
Copyright © International Astronomical Union 2009

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