Nongyrotropic distribution of pickup ions at comet P/Grigg-Skjellerup: A possible source of wave activity

Details Nongyrotropic distribution of pickup ions at comet P/Grigg-Skjellerup: A possible source of wave activity Nongyrotropic distribution of pickup ions at comet P/Grigg-Skjellerup: A possible source of wave activity

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9820977m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A12, p. 20,977-20,983

Astronomy and Astrophysics

Astronomy

26

Grigg-Skjellerup Comet, Interplanetary Magnetic Fields, Ion Cyclotron Radiation, Molecular Ions, Plasma-Particle Interactions, Polarized Electromagnetic Radiation, Solar Wind, Spaceborne Astronomy, Giotto Mission, Gyrofrequency, Halley'S Comet, Magnetometers, Solar Wind Velocity, Water

Scientific paper

The pickup of newborn cometary ions in the solar wind excites strong wave activity. At comet P/Grigg-Skjellerup the interplanetary magnetic field is nearly perpendicular to the solar wind velocity; thus the pickup ions should form a ring distribution. In opposition to P/Halley, comet P/Grigg-Skjellerup is rather small, and its inhomogeneity scale is even smaller than the pickup scale. Therefore the ring will be filled incompletely, and the distribution becomes nongyrotropic. The dispersion of a nongyrotropic cometary pickup distribution in a cold proton-electron background plasma is studied. Nongyrotropy couples the gyrotropic eigenmodes and drives an instability. Left-hand polarized waves close to the cometary ion cyclotron frequency are excited.

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