ULF waves at comets Halley and Giacobini-Zinner - Comparison with simulations

Details ULF waves at comets Halley and Giacobini-Zinner - Comparison with simulations ULF waves at comets Halley and Giacobini-Zinner - Comparison with simulations

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9411989l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Sept. 1, 1989, p. 11989-11995. Research sponsored by DOE.

Statistics

Computation

10

Computational Astrophysics, Extremely Low Radio Frequencies, Giacobini-Zinner Comet, Halley'S Comet, Interplanetary Magnetic Fields, Ion Cyclotron Radiation, Computerized Simulation, Doppler Effect, Gyrofrequency, Ion Injection, Solar Wind, Comets, Giacobini-Zinner, Halley, Simulations, Comparisons, Distance, Numerical Methods, Magnetic Properties, Amplitude, Waves, Resonance, Injection, Calculations, Techniques, Experiments, Magnetic Fields, Energy, Density, Frequencies, Protons, Water, Ions

Scientific paper

A comparison is made between observations and numerical simulations of magnetic fluctuations near the proton and water group ion cyclotron frequencies as a function of distance from the comets Halley and Giacobini-Zinner. The amplitude of waves due to different cyclotron resonant instabilities is monitored by examining the amplitude of waves near the gyrofrequency of the respective ions, measured in by the ICE spacecraft. The results are compared with a one-dimensional electromagnetic hybrid simulation of two-ion pickup based on the predictions of Gary et al. (1989). The observations are consistent with the prediction that amplitudes are dependent on the properties of the injected beams and the local injection rate.

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