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| Titel |
Magnetospheric convection electric field dynamics andstormtime particle energization: case study of the magneticstorm of 4 May 1998 |
| VerfasserIn |
G. V. Khazanov, M. W. Liemohn, T. S. Newman, M.-C. Fok, A. J. Ridley |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 22, no. 2 ; Nr. 22, no. 2 (2004-01-01), S.497-510 |
| Datensatznummer |
250014778
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| Publikation (Nr.) |
 copernicus.org/angeo-22-497-2004.pdf |
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| Zusammenfassung |
It is shown that narrow channels of high electric field are an effective mechanism for injecting
plasma into the inner magnetosphere. Analytical expressions for the electric field cannot
produce these channels of intense plasma flow, and thus, result in less entry and adiabatic energization of
the plasma sheet into near-Earth space. For the ions, omission of these channels leads to an
underprediction of the strength of the stormtime ring current and therefore, an underestimation of
the geoeffectiveness of the storm event. For the electrons, omission of these channels leads to
the inability to create a seed population of 10-100 keV electrons deep in the inner
magnetosphere. These electrons can eventually be accelerated into MeV radiation belt particles.
To examine this, the 1-7 May 1998 magnetic storm is studied with a plasma transport model by
using three different convection electric field models: Volland-Stern, Weimer, and AMIE. It is
found that the AMIE model can produce particle fluxes that are several orders of magnitude
higher in the L = 2 – 4 range of the inner magnetosphere, even for a similar total cross-tail potential
difference.
Key words. Space plasma physics (charged particle motion
and acceleration) – Magnetospheric physics (electric fields,
storms and substorms) |
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