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Title: Polar ionosphere as a source of the storm time ring current

Abstract

The transport of ions from the polar ionosphere to the inner magnetosphere during storm time conditions has been computed using a Monte Carlo diffusion code. The effect of the electrostatic turbulence assumed to be present during the substorm expansion phase was simulated by a process that accelerated the ions stochastically perpendicular to the magnetic field with a diffusion coefficient proportional to the rate of energization of the ions by the induced electric field. This diffusion process was continued as the ions were convected from the plasma sheet boundary layer to the double-spiral injection boundary. Inward of the injection boundary the ions were convected adiabatically. By using as input an O/sup +/ flux of 2.8 x 10/sup 8/ cm/sup -2/ s/sup -1/ (w>10 eV) and an H/sup +/ flux of 5.5 x 10/sup 8/ cm/sup -2/ s/sup -1/ (w>.63 eV) the computed distribution functions of the ions in the ring current were found to be in good agreement, over a wide range in L(4--8), with measurements made with the ISEE 1 satellite during a storm. This O/sup +/ flux and a large part of the H/sup +/ flux appear to be consistent with the DE-1 and DE-2 satellite measurements of themore » polar ionospheric outflow during disturbed times.« less

Authors:
;
Publication Date:
Research Org.:
Lockheed Palo Alto Research Laboratory, California
OSTI Identifier:
5772557
Resource Type:
Journal Article
Journal Name:
J. Geophys. Res.; (United States)
Additional Journal Information:
Journal Volume: 90:A4
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; MAGNETIC STORMS; RING CURRENTS; BOUNDARY LAYERS; DIFFUSION; DISTRIBUTION FUNCTIONS; ELECTRIC FIELDS; IONOSPHERIC EFFECTS; MAGNETOSPHERE; MONTE CARLO METHOD; PLASMA SHEET; CURRENTS; EARTH ATMOSPHERE; EARTH MAGNETOSPHERE; ELECTRIC CURRENTS; FUNCTIONS; LAYERS; 640203* - Atmospheric Physics- Magnetospheric Phenomena- (-1987)

Citation Formats

Cladis, J B, and Francis, W E. Polar ionosphere as a source of the storm time ring current. United States: N. p., 1985. Web. doi:10.1029/JA090iA04p03465.
Cladis, J B, & Francis, W E. Polar ionosphere as a source of the storm time ring current. United States. doi:10.1029/JA090iA04p03465.
Cladis, J B, and Francis, W E. Mon . "Polar ionosphere as a source of the storm time ring current". United States. doi:10.1029/JA090iA04p03465.
@article{osti_5772557,
title = {Polar ionosphere as a source of the storm time ring current},
author = {Cladis, J B and Francis, W E},
abstractNote = {The transport of ions from the polar ionosphere to the inner magnetosphere during storm time conditions has been computed using a Monte Carlo diffusion code. The effect of the electrostatic turbulence assumed to be present during the substorm expansion phase was simulated by a process that accelerated the ions stochastically perpendicular to the magnetic field with a diffusion coefficient proportional to the rate of energization of the ions by the induced electric field. This diffusion process was continued as the ions were convected from the plasma sheet boundary layer to the double-spiral injection boundary. Inward of the injection boundary the ions were convected adiabatically. By using as input an O/sup +/ flux of 2.8 x 10/sup 8/ cm/sup -2/ s/sup -1/ (w>10 eV) and an H/sup +/ flux of 5.5 x 10/sup 8/ cm/sup -2/ s/sup -1/ (w>.63 eV) the computed distribution functions of the ions in the ring current were found to be in good agreement, over a wide range in L(4--8), with measurements made with the ISEE 1 satellite during a storm. This O/sup +/ flux and a large part of the H/sup +/ flux appear to be consistent with the DE-1 and DE-2 satellite measurements of the polar ionospheric outflow during disturbed times.},
doi = {10.1029/JA090iA04p03465},
journal = {J. Geophys. Res.; (United States)},
number = ,
volume = 90:A4,
place = {United States},
year = {1985},
month = {4}
}