Physics
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86..189w&link_type=abstract
Journal of Geophysical Research, vol. 86, Jan. 1, 1981, p. 189-194.
Physics
20
Equatorial Atmosphere, Ion Currents, Magnetic Storms, Magnetospheric Instability, Magnetospheric Ion Density, Ring Currents, Density Distribution, Explorer 45 Satellite, Geomagnetism, Magnetic Moments, Particle Energy
Scientific paper
Observations of near equatorially mirroring ring current ions before and after a magnetic storm are presented in the form of phase space densities with respect to the first adiabatic invariant. Particle densities were obtained from the medium energy particles instrument covering the energy range 24-2081 keV on ISEE 1 at L values between 3 and 8 earth radii and ratios of the magnetic field at the satellite position to the magnetic field at the magnetic equator less than 1.2. Analysis of the phase space densities through the magnetosphere reveals a well-defined high magnetic moment peak in the prestorm near-equatorial ring current ion phase space density distribution, with the magnetic storm resulting from an enhancement of phase space densities at magnetic moment values below the peak and phase space densities remaining constant above the peak. Results are found to be in good agreement with those obtained by Explorer 45 six years previously, indicating that the observed phase space density variations are characteristic of energetic ion behavior during magnetic storms.
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