Analysis of processes leading to localized electron enhancements in the outer radiation belt

Details Analysis of processes leading to localized electron enhancements in the outer radiation belt Analysis of processes leading to localized electron enhancements in the outer radiation belt

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23.1495m&link_type=abstract

Planetary and Space Science, vol. 23, Nov. 1975, p. 1495-1506.

Physics

1

Electron Precipitation, Esro 4 Satellite, Magnetospheric Instability, Outer Radiation Belt, Diurnal Variations, Ionospheric Currents, Magnetic Equator, Polar Orbits

Scientific paper

Information about intensity enhancements of electrons with energies in excess of 500 keV, which have been observed intermittently close to the outer edge of the electron radiation belt, is used in conjunction with an earlier statistical study by Brown and Stone (1972) to investigate processes which could lead to such structures. The enhancements are typically about 20 sec in duration and occur in a very narrow invariant latitude band, maximally 2 deg wide. The intensity increase relative to the 'normal' background level is enhanced by a factor 10, and the 'spike' frequency of occurrence is strongly local time-dependent, with more spikes observed in the night and dusk-noon sectors than in the noon-dawn sector. The processes investigated quantitatively are distortions of the magnetospheric topology in the equatorial region, wave-particle interactions, and the effects of ionospheric currents. It is shown that the various processes which contribute to equatorial field disturbances can explain the observations.

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