Physics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2675k&link_type=abstract
Journal of Geophysical Research, vol. 83, June 1, 1978, p. 2675-2682.
Physics
8
Adiabatic Conditions, Equatorial Atmosphere, Geomagnetism, Particle Flux Density, Pitch (Inclination), Anisotropic Media, Ats 6, Diurnal Variations, Ionospheric Electron Density, Magnetic Flux, Magnetically Trapped Particles, Proton Density (Concentration)
Scientific paper
Particle measurements from the geostationary ATS 6 satellite reveal striking equatorial pitch-angle anisotropies. A study of seven days of data shows a diurnal variation in anisotropy with the particle flux at a pitch angle of 40 deg greater than that at 90 deg during times of low magnetic-field intensity on the nightside and vice versa during times of high magnetic-field intensity on the dayside. Six representative anisotropy events are studied in finer detail. The 32- to 51-keV electron anisotropies increase and decrease with the total magnetic-field intensity. The proton and higher-energy electron anisotropies do not show as much variation. The particle anisotropies are studied in light of adiabatic and cyclotron resonance theory; the results indicate that adiabatic effects are the dominant modulation mechanism of particle pitch-angle distributions in the outer radiation belt
Kaye Stanley M.
Lin Chang-Shou
Parks George K.
Winckler John R.
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