Diffusion coefficients of energetic water group ions near Comet Giacobini-Zinner

Details Diffusion coefficients of energetic water group ions near Comet Giacobini-Zinner Diffusion coefficients of energetic water group ions near Comet Giacobini-Zinner

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3613t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3613-3621.

Physics

1

Diffusion Coefficient, Giacobini-Zinner Comet, Ion Distribution, Magnetohydrodynamic Waves, Water, Bow Waves, International Sun Earth Explorer 3, Mean Free Path, Comets, Ions, Giacobini-Zinner, Diffusion, Water, Spectrometry, Flux, Spacecraft Observations, Ice Mission, Analysis, Spectra, Downstream, Scattering, Collisions, Frequency, Alfven Waves, Uleca Instrument, Epas Instrument, Equipment, Calculations, Comparions, Acceleration, Theorerical Studies

Scientific paper

Data from the ultralow-energy charge analyzer and energetic particle anisotropy spectrometer sensors, acquired when the ICE spacecraft flew past Comet Giacobini-Zinner on September 11, 1985, are combined, and a single, self-consistent analysis technique is applied to derive a single-particle spectrum from about 200 to 1600 km/s. This information, together with the deduced bulk flow speed of the ions, is used to calculate a parallel diffusion coefficient in the transition region downstream of the bow wave (2.3 +/- 0.5) x 10 exp 17 sq cm/s; the corresponding scattering mean free path is (6 +/- 1) x 10 exp 4 km. The parallel diffusion coefficient is found to depend on the collision frequency of water group ions with Alfven waves, which are assumed to be propagating parallel (antiparallel) to the magnetic field.

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