Observations of energetic water-group ions at Comet Giacobini-Zinner - Implications for ion acceleration processes

Details Observations of energetic water-group ions at Comet Giacobini-Zinner - Implications for ion acceleration processes Observations of energetic water-group ions at Comet Giacobini-Zinner - Implications for ion acceleration processes

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35.1323r&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 35, Oct. 1987, p. 1323-1345.

Computer Science

31

Giacobini-Zinner Comet, Molecular Ions, Particle Acceleration, Water, Cosmochemistry, Energy Spectra, International Sun Earth Explorer 3, Ion Distribution, Comets, Giacobini-Zinner, Ions, Acceleration, Spacecraft Observations, Ice Mission, Epas Instrument, Energy, Spectra, Comparisons, Distribution, Theoretical Studies, Upstream, Turbulence, Equipment, Analysis, Velocity, Spectroscopy, Scattering

Scientific paper

Observations of energetic water-group pick-up ions made by the EPAS instrument during ICE fly-by of Comet P/Giacobini-Zinner are investigated for evidence concerning the processes which accelerate the ions from initial pick-up energies of around 10 keV to energies of a few hundred keV. The form of the ion spectrum in the ion rest frame is investigated and compared with theoretical suggestions that exponential energy distributions might be produced by either first- or second-order Fermi acceleration in the cometary environment. It is shown that such distributions do not fit the data at all well, but that rather the observed distribution functions closely approximate an exponential in ion speed. The variations of ion intensity and spectral hardness which occur during the comet encounter are investigated, and an indication of the degree of isotropy of the ion distribution in the rest frame of the flow is obtained.

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