Trajectory traces of charged particles in the magnetosphere

Details Trajectory traces of charged particles in the magnetosphere Trajectory traces of charged particles in the magnetosphere

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.4798e&link_type=abstract

Journal of Geophysical Research, vol. 83, Oct. 1, 1978, p. 4798-4810.

Physics

43

Charged Particles, Earth Magnetosphere, Energetic Particles, Magnetic Storms, Particle Trajectories, Ring Currents, Satellite Observation, Convective Flow, Electric Fields, Explorer 45 Satellite, Particle Motion, Plasmapause, Spectroscopic Analysis, Time Dependence

Scientific paper

The characteristic enhancements of ring current particles with energies of about 1-100keV, associated with magnetospheric substorms, were observed by Explorer 45 (S3-A) around the plasmapause in the afternoon to midnight region and showed the characteristic structure called a 'nose' in the proton spectrograms. The paper examines the time-developing characteristics of newly injected particles in the magnetosphere under a recently proposed convection electric field and a dipole magnetic field. Approximate equations of a bounce period, a second adiabatic invariant, and a bounce-averaged azimuthal velocity are given with an error of less than about 0.001 for all pitch angles. The complete set of flow patterns of 90-deg pitch angles is also described by means of inflection lines through which radial and/or azimuthal drifts change their directions and where particle velocities show their local minima, i.e., the flow becomes sluggish. These particle tracings in the magnetosphere, from which time-dependent particle fronts can be constructed, give the basic concept and mechanics to explain the complex and dynamical properties of the magnetic storm time particle enhancements.

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