Physics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88..174k&link_type=abstract
Journal of Geophysical Research, vol. 88, Jan. 1, 1983, p. 174-182.
Physics
26
Charged Particles, Geomagnetic Pulsations, Low Frequencies, Spacecraft Motion, Earth Magnetosphere, Gyration, Particle Spin, Wave Interaction, Wave Propagation
Scientific paper
Ways in which waves can produce particle distributions which, at a fixed spatial point, depend on detector look direction are described. A model of a spinning spacecraft for which the look direction of the particle detector varies periodically as the spacecraft spins is adopted. The conditions under which low-frequency waves may cause the particle fluxes to be modulated at the spacecraft spin frequency or its harmonics are considered. The hypothetical spacecraft is idealized by assuming that its spin axis is either parallel or perpendicular to the local magnetic field. Ways are described in which spin phase dependence is produced in each of these special geometries, but for arbitrary spin orientation some combination of the different modulation processes is possible. It is assumed that the particle gyroperiod is much shorter than the spacecraft spin period throughout.
Galland Kivelson Margaret
Southwood David J.
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