Physics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95..947g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Feb. 1, 1990, p. 947-955. Research supported by NASA and BMFT.
Physics
17
Halley'S Comet, Low Frequencies, Wave Generation, Giotto Mission, Plasma Diagnostics, Power Spectra, Comets, Halley, Waves, Frequencies, Spacecraft Observations, Plasma, Giotto Mission, Magnetic Fields, Distribution, Ions, Calculations, Origin, Formation, Harmonics, Water, Diagrams, Particles
Scientific paper
The extent to which the properties of the waves observed at comet Halley during the Giotto encounter can be understood within the context of linearized Vlasov theory is investigated. In the region that is magnetically connected to the comet, fluctuations in the plasma frame of reference are detected near 4 and 10 mHz, close to the water cyclotron frequency, as well as at 20-60 mHz, which is well above the water cyclotron frequency. Using a variety of approximations for the ion distribution function, it is shown that waves having properties similar to those observed can then be generated with appropriate choices of plasma parameters. In the region that is magnetically disconnected from the comet, distinct peaks are observed in the magnetic power spectrum at 7, 21, 29, and 35 mHz, with a hint of a peak at 14 mHz.
Glassmeier Karl-Heintz
Goldstein Michel L.
Wong Hung K.
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