Physics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.9479m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, June 1, 1991, p. 9479-9490. DOE-sponsored research.
Physics
9
Cometary Atmospheres, Ionization, Magnetic Field Configurations, Solar Magnetic Field, Solar Wind, Cyclotron Radiation, Magnetohydrodynamic Waves, Wave Propagation
Scientific paper
The properties of low frequency magnetic fluctuations generated by cometary ion pickup are examined by means of one-dimensional hybrid simulations, in which newborn ions are created at a constant rate. The helicity and direction of propagation of magnetic fluctuations are investigated for various cometary ion injection angles, alpha, relative to the solar wind magnetic field. The parameter eta represents the relative contribution of wave energy density propagating in the direction away from the comet, parallel to the beam. For small (quasi-parallel) injection angles, alpha is about 0 deg and eta is of order unity, while for larger (quasi-perpendicular) angles, alpha is about 90 deg and eta is about 0.5. At intermediate angles, alpha is about 60 deg, eta can vary between 0 and 1, depending on the wave number. The wave properties are consistent with the instabilities expected from linear theory.
Gary Peter S.
Gombosi Tamas I.
Miller Ronald H.
Winske Dan
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