Effects of convection electric field on the distribution of ring current type protons

Details Effects of convection electric field on the distribution of ring current type protons Effects of convection electric field on the distribution of ring current type protons

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23.1045g&link_type=abstract

Planetary and Space Science, vol. 23, July 1975, p. 1045-1052.

Computer Science

1

Convective Flow, Electric Fields, Magnetospheric Proton Density, Proton Precipitation, Ring Currents, Geomagnetic Tail, Ionospheric Currents, Plasma Dynamics, Proton Energy, Satellite Observation, Thermal Plasmas

Scientific paper

The topology of the boundaries of penetration (or, inversely, the boundaries of the forbidden regions) of 90-deg pitch-angle equatorial protons with energies less than 100 keV are explored for an equatorial convection E-field which is directed in general from dawn to dusk. Due to the dependence of drift path on energy (or magnetic moment), complex structural features are expected in the proton energy spectra detected by satellites since the penetration distance of a proton is not a monotonically increasing or decreasing function of energy. During a storm when the convection E is enhanced, model calculations predict elongations of the forbidden regions analogous to tail extensions of the plasmasphere. Following a reduction in the convection field, spiral-structured forbidden regions can occur. Structural features inherent to large-scale convection field changes may be seen in the nose-like proton spectrograms observed near dusk by instrumentation on Explorer 45. These nose events are modelled by using an electric field model developed originally by Volland (1973). The strength of the field is related to the Kp index through night-time equatorial plasmapause measurements.

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