Physics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..259t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 13, March 1986, p. 259-262. NASA-supported research.
Physics
135
Comet Tails, Giacobini-Zinner Comet, Interplanetary Magnetic Fields, Magnetohydrodynamic Turbulence, Solar Wind, Space Plasmas, Ion Temperature, Ionic Reactions, Magnetohydrodynamic Waves, Plasma-Particle Interactions, Power Spectra, Comets, Giacobini-Zinner, Ice Mission, Spacecraft Observations, Energy, Turbulence, Magnetohydrodynamics, Intensity, Magnetic Properties, Ions, Solar Wind, Interaction, Distribution
Scientific paper
The turbulence surrounding Comet Giacobini-Zinner reached intensities three orders of magnitudes above that of 'intermediate' solar wind conditions, was characterized by Delta B/B0 almost equal to one, and extended to cometocentric distances beyond one-million km. The strong spectral peak at 0.01 Hz and the general intensity profile of the turbulence are in excellent agreement with generation by plasma instabilities associated with the pickup of H2O(+) group ions. The total energy of the magnetic turbulence near 0.01 Hz is estimated to be 5 x 10 to the 15th joules and that of ion energization due to solar wind pickup 6 x 10 to the 13th watts. It thus takes a minimum of 100 s to build up the magnetic turbulence. This scale is approximately the linear growth rate of the ion pickup instability, giving a consistent picture of the energy source of the turbulence.
Smith Edward. J.
Tsurutani Bruce T.
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