Charged particle behavior in low-frequency geomagnetic pulsations. I Transverse waves

Details Charged particle behavior in low-frequency geomagnetic pulsations. I Transverse waves Charged particle behavior in low-frequency geomagnetic pulsations. I Transverse waves

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.5643s&link_type=abstract

Journal of Geophysical Research, vol. 86, July 1, 1981, p. 5643-5655.

Physics

47

Charged Particles, Earth Magnetosphere, Geomagnetic Pulsations, Magnetohydrodynamic Waves, Space Plasmas, Transverse Waves, Gyration, Particle Acceleration, Particle Energy, Particle Motion, Plasma-Particle Interactions, Radiation Counters, Spacecraft Instruments

Scientific paper

The behavior of charged particles in low-frequency geomagnetic pulsations is examined, with particular emphasis given to what a spacecraft-borne detector would observe. Special attention is given to the effects of purely transverse electromagnetic signals. It is shown that the time scale of a particle's motion relative to the wave period determines the nature of its response. With low-energy particles, the acceleration in the last gyro-period before detection is what matters. At higher energies, what has occurred over recent bounce and drift motions increases in importance, and convection of gradients by the wave E x B drift must be considered. Distinguishing features, for example phase differences between signals in back-to-back detectors or between channels of different energy, are catalogued. In particular, the detectability of resonance effects is assessed in the light of detector characteristics and finite signal bandwidth. Use is made of recent observations to illustrate the ideas developed.

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