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| Titel |
Resistive MHD reconstruction of two-dimensional coherent structures in space |
| VerfasserIn |
W.-L. Teh, B. U. Ö. Sonnerup, J. Birn, R. E. Denton |
| 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 ; 28, no. 11 ; Nr. 28, no. 11 (2010-11-24), S.2113-2125 |
| Datensatznummer |
250016916
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| Publikation (Nr.) |
 copernicus.org/angeo-28-2113-2010.pdf |
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| Zusammenfassung |
| We present a reconstruction technique to solve the steady resistive MHD
equations in two dimensions with initial inputs of field and plasma data
from a single spacecraft as it passes through a coherent structure in space.
At least two components of directly measured electric fields (the spacecraft
spin-plane components) are required for the reconstruction, to produce
two-dimensional (2-D) field and plasma maps of the cross section of the
structure. For convenience, the resistivity tensor η is assumed
diagonal in the reconstruction coordinates, which allows its values to be
estimated from Ohm's law, E+v×B=η·j. In the present paper,
all three components of the electric field are used. We benchmark our
numerical code by use of an exact, axi-symmetric solution of the resistive
MHD equations and then apply it to synthetic data from a 3-D, resistive, MHD
numerical simulation of reconnection in the geomagnetic tail, in a phase of
the event where time dependence and deviations from 2-D are both weak. The
resistivity used in the simulation is time-independent and localized around
the reconnection site in an ellipsoidal region. For the magnetic field,
plasma density, and pressure, we find very good agreement between the
reconstruction results and the simulation, but the electric field and plasma
velocity are not predicted with the same high accuracy. |
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