Physics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9211041l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Oct. 1, 1987, p. 11041-11052.
Physics
133
Interstellar Gas, Magnetohydrodynamic Waves, Solar Wind, Wave Excitation, Ampte (Satellites), Bow Waves, Helium Ions, Hydrogen Ions, Polarization Characteristics, Spectrum Analysis
Scientific paper
Interstellar atoms penetrate the heliosphere, are ionized by solar UV radiation or charge exchange with solar wind ions, and are "picked up" by the solar wind onto a ring distribution in velocity space. The ring distribution is unstable to the generation of hydromagnetic waves with growth time scales which are small compared with those of the continual pickup process and convection with the solar wind. First, the growth rates for parallel propagation are derived, presented, and compared with previous work. Then the spatially homogeneous quasi-linear equations describing the subsequent hydromagnetic wave excitation and pickup ion velocity diffusion in pitch angle and energy are presented under the assumption of wave propagation parallel to the ambient magnetic field. Neglecting ion energy changes, analytical expressions for the time-asymptotic wave spectra accompanying the time-asymptotic isotropic ion distribution are derived.
Huen Ip Wing
Lee Martin A.
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