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  • 1
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    Behavior of ionized plasma in the high latitude topside ionosphere - The polar wind (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A numerical model is used to investigate the steady-state behavior of a fully ionized plasma encompassing the geomagnetic field lines from 1500 km to 10 earth radii, and solutions of the 16 moment system of transport equations for the polar wind are obtained. For the present cases studied, results of the 13 and 16 moment simulations are found to be similar, although the temperature anisotropy is quite high. Polar wind studies reveal an electron temperature anisotropy developing around 2500 km, with the collisions keeping the electron temperature isotropic below 2500 km. Good agreement is found between the present polar wind simulations and recent observations.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science (ISSN 0032-0633); 35; 703-714
    Format: text
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  • 2
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    A simulation of high latitude F-layer instabilities in the presence of magnetosphere-ionosphere coupling (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A simulation of inertial high-latitude ionospheric interchange instabilities, including magnetospheric coupling effects is presented. It is shown that the primary magnetosphere-ionosphere coupling effect is to incorporate the inertia of the magnetospheric plasma in the analysis. The following conclusions are drawn from the simulation: (1) magnetospheric coupling effects reduce the growth rate of the interchange instability, (2) striations produced by the inertial interchange instability develop in a different manner than in the noninertial regime, and (3) striations produced in the inertial regime are more isotropic and spread out, resulting in irregularities oriented perpendicular to those produced in the noninertial case.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 12; 283-286
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  • 3
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    O(+) acceleration due to resistive momentum transfer in the auroral field line plasma (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An analytical model is defined to demonstrate that parallel acceleration of an O(+) ion beam in the ionosphere can occur naturally due to the presence of a quasi-static parallel electric field. Momentum equations are defined for friction between hydrogen ions and electrons, which produces a quasi-static electric field. The field can accelerate ions, e.g., the O(+) ions, which do not participate in the frictional momentum exchange. The conditions are shown to be applicable to the auroral field line plasma if a current is present along the magnetic field. A simulation performed with the equations shows that the field line plasma exhibits dynamic behavior after a field-aligned current appears. The resulting momentum gain by O(+) ions can be sufficient for causing a potential drop of several kilovolts along the field line.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 7573-757
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  • 4
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    Transverse motion of high-speed barium clouds in the ionosphere (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Simulation results, based on a field-line-integrated, two-dimensional, electrostatic model, are presented for the motion of a barium cloud injected transverse to the geomagnetic field in the ionosphere at high speeds. It is found that the gross evaluation of injected plasma clouds depends on the initial conditions, as well as the nature of the background coupling. For a massive (mass of about 10 kg), orbital (velocity of about 5 km/s) release in the F region (350-450 km), it is found that plasma clouds can drift tens of kilometers across the magnetic field in tens of seconds after ionization. This type of release is similar to those which are planned for the Combined Release and Radiation Effects Satellite mission.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 11
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  • 5
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    A dynamic model for the auroral field line plasma in the presence of field-aligned current (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: (Previously announced in STAR as N83-11644)
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 88; Mar. 1
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  • 6
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    Diodelike response of high-latitude plasma in magnetosphere-ionosphere coupling in the presence of field-aligned currents (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The dynamic processes in the plasma along high-latitude field lines plays an important role in ionosphere-magnetosphere coupling process. A time-dependent, large-scale simulation of these dynamics parallel to the geomagnetic field lines from the ionosphere well into the magnetosphere is created. The plasma consists of hot e(-) and H(+) of magnetospheric origin and low-energy e(-), H(+), and O(+) of ionospheric origin. Including multiple electron species, a major improvement to the model, made it possible for the first time to simulate the upward current region properly and to dynamically simulate the diodelike response of the field-line plasma to the parallel currents coupling the ionosphere and magnetosphere. It is shown that return currents flow with small resistance, while upward currents produce kilovolt-sized potential drops along the field, as concluded from satellite observations. The kilovolt potential drops are due to the effect of the converging magnetic field on the high-energy magnetospheric electrons.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 97; A8 A; 12
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  • 7
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    A Simulation of High Latitude F-Layer Instabilities in the Presence of Magnetosphere-Ionosphere Coupling (1985)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A magnetic-field-line-integrated model of plasma interchange instabilities is developed for the high latitude ionosphere including magnetospheric coupling effects. We show that primary magnetosphere-ionosphere coupling effect is to incorporate the inertia of the magnetospheric plasma in the analysis. As a specific example, we present the first simulation of the E x B instability in the inertial regime, i.e., nu sub i omega where nu sub i is the ion-neutral collision frequency and omega is the wave frequency. We find that the inertial E x B instability develops in a fundamentally different manner than in the collisional case ni sub i omega. Our results show that striations produced in the inertial regime are spread and retarded by ion inertial effects, and result in more isotropic irregularities than those seen in the collisional case.
    Keywords: Geophysics
    Type: NASA-CR-176296 , NAS 1.26:176296 , AD-A157475 , NRL-5597
    Format: application/pdf
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