Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..169t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 3, p. 169-172.
Physics
4
Cometary Atmospheres, Cyclotron Radiation, Giacobini-Zinner Comet, Gyrofrequency, Magnetohydrodynamic Waves, Polarization (Waves), Power Spectra, Hydrogen Ions, Oxygen Ions, Protons, Comets, Giacobini-Zinner, Waves, Spectra, Magnetosonic Waves, Ions, Power, Density, Polarization, Parameters, Frequencies, Saturation, Magnetohydrodynamics, Spacecraft Observations, Ice Mission, Harmonics, Techniques, Magnetic Field, Mag Instrument, Whistlers
Scientific paper
We have computed frequency spectra of power density and polarization parameters of magnetohydrodynamic waves from observations on board the ICE spacecraft as it flew past Comet Giacobini-Zinner on September 11, 1985. Since the spectral parameters are frequency dependent, we find that the analysis is best carried out in a 'wave' reference frame where one of the major axes is along the wave normal direction for each frequency component. The power density along the wave normal direction shows a systematic peak structure which we identify as belonging to cyclotron wave harmonics of pickup ions near the comet. The fundamental harmonics of the cyclotron waves are also consistent with the gyrofrequencies calculated from the magnetic field data.
Mason Glenn M.
Tan Chang-Lin
Tsurutani Bruce T.
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