Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1302...58h&link_type=abstract
PICKUP IONS THROUGHOUT THE HELIOSPHERE AND BEYOND: Proceedings of the 9th Annual International Astrophysics Conference. AIP Con
Astronomy and Astrophysics
Astrophysics
Interplanetary Matter, Solar Wind, Mass Spectrometers, Spacecraft, Interplanetary Dust And Gas, Particle Emission, Solar Wind, Mass Spectrometers, Spacecraft/Atmosphere Interactions
Scientific paper
There is a continuing debate about the applicability of the theory presented by Fisk and Gloeckler (FG) regarding the formation of suprathermal ion tails in phase space density vs. velocity spectra; in the solar wind frame the FG theory predicts a power law index of-5 (which is equivalent to a differential intensity vs. energy index of-1.5). There has also been uncertainty and perhaps misunderstanding regarding the extent to which such spectra are actually observed; i.e., is there really a significant preference for the -5 index? Here we report the results of an interim technique we use to analyze ~1-100 keV/nucleon interplanetary suprathermal H+, He+, and He++, spectra measured at the Cassini spacecraft by the Charge Energy Mass Spectrometer (CHEMS) instrument of the Magnetospheric Imaging Instrument (MIMI) suite during the cruise to Saturn. We analyzed 18 active periods and report a mean index in the solar wind frame of 4.9+/-0.4 for protons, 5.2+/-0.5 for He+, and 4.7+/-0.2 for alpha particles. MIMI/CHEMS offers much needed independent observations of heliospheric ions in the suprathermal energy range.
Hamilton Douglas C.
Hill Matthew E.
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