Pickup protons and water ions at Comet Halley - Comparisons with Giotto observations

Details Pickup protons and water ions at Comet Halley - Comparisons with Giotto observations Pickup protons and water ions at Comet Halley - Comparisons with Giotto observations

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.1311y&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A2, p. 1311-1323.

Physics

10

Energetic Particles, Halley'S Comet, Ion Temperature, Proton Energy, Solar Wind, Water, Energy Distribution, Giotto Mission, Power Spectra, Comets, Solar Wind, Bowshock, Velocity, Halley, Upstream, Diffusion, Protons, Pickup, Water, Ions, Comparison, Spacecraft Observations, Giotto Mission, Models, Density, Turbulence, Parameters, Pitch Angle, Power, Numerical Methods, Energy, Theoretical Studies, Compression, Calculations

Scientific paper

The cometary ion pickup process along the sun-comet line at Comet Halley is investigated using a quasi-linear diffusion model including both pitch angle and energy diffusion, adiabatic compression, and convective motion with the solar wind flow. The model results are compared with energetic ion distributions observed by instruments on board the Giotto spacecraft. The observed power spectrum index of magnetic turbulence (gamma) is 2-2.5. The present simulation shows that when gamma was 2, the calculated proton distributions were much more isotropic than the observed ones. The numerical solutions of the quasi-linear diffusion equations show that the isotropization of the pickup ion distribution, particularly at the pickup velocity, is not complete even close to the bow shock. Given the observed turbulence level, quasi-linear theory yields pickup ion energy distributions that agree with the observed ones quite well and easily produces energetic ions with energies up to hundreds of keV.

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