Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.8536k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Aug. 1, 1987, p. 8536-8544. Research supported by the University of C
Astronomy and Astrophysics
Astronomy
10
Astronomical Models, Energetic Particles, Giacobini-Zinner Comet, International Sun Earth Explorer 3, Ion Motion, Field Strength, Ion Temperature, Kinetic Energy, Magnetic Fields, Particle Trajectories, Velocity Distribution, Comets, Giacobini-Zinner, Ions, Ice Mission, Spacecraft Observations, Models, Plasma, Solar Wind, Interaction, Motion, Magnetic Fields, Magnetohydrodynamics, Velocity, Structure, Spectra, Compression, Flow, Flux, Water, Calculations, Carbon Dioxide, Trajectories, Density, Charged Parti
Scientific paper
Energetic ions observed during the International Cometary Explorer (ICE) spacecraft flyby of comet Giacobini-Zinner provide information about both the constitution of comets and the plasma physical processes associated with their interaction with the solar wind. In this investigation the details of ion 'pickup,' in the limit where small-scale fluctuations in the plasma and magnetic field are neglected, are modeled by following the motion of a large number of initially cold, heavy (mass 18) ions in a global magnetohydrodynamic model of the local plasma and magnetic field. The results indicate how the background or macroscopic velocity and magnetic field structure of the comet can affect the average spatial and spectral characteristics of the observed cometary ions. These effects, which occur by virtue of forces associated with the compression and the curvature of the magnetic field in the presence of the stagnating plasma flow, can explain the double maxima in the time series of the energetic ion flux observed along the ICE trajectory.
Fedder Joel A.
Kimmel C. D.
Luhmann Janet G.
Phillips John Lynch
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