Physics
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.275...43h&link_type=abstract
Nature, vol. 275, Sept. 7, 1978, p. 43-45.
Physics
19
Earth Magnetosphere, Ion Distribution, Magnetic Variations, Magnetohydrodynamic Waves, Plasma Oscillations, Satellite Observation, Ats 6, Earth (Planet), Free Energy, Magnetometers, Particle Interactions, Planetary Magnetic Fields, Resonance, Velocity Distribution
Scientific paper
Fluxgate magnetometer data and particle detector data from the geosynchronous spacecraft ATS6 are reported for magnetic oscillations transverse to the earth's magnetic field in the presence of a plasma ion distribution with a 'bump-in-tail' form. The data are for ions and electrons with energies from 10 eV to 80 keV. It is suggested that the oscillations are Alfven waves, that the monotonicity (that is, population inversion) of the energy distribution provides a source of free energy for the oscillations, and that the particle-wave interaction is through bounce resonance. It is suggested that the regular occurrence of nonmonotonic ion distributions in the afternoon-evening magnetosphere may be the source of many of the pc4 pulsations characteristic of this sector at geosynchronous orbit.
Barfield J. N.
Hughes Jeffrey W.
Mauk B.
McPherron Robert L.
Southwood David J.
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