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| Titel |
Validation of the stream function method used for reconstruction of experimental ionospheric convection patterns |
| VerfasserIn |
P. L. Israelevich, V. O. Papitashvili, A. I. Ershkovich |
| 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 ; 18, no. 4 ; Nr. 18, no. 4, S.454-460 |
| Datensatznummer |
250013956
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| Publikation (Nr.) |
 copernicus.org/angeo-18-454-2000.pdf |
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| Zusammenfassung |
In this study we test a stream function
method suggested by Israelevich and Ershkovich for instantaneous reconstruction
of global, high-latitude ionospheric convection patterns from a limited set of
experimental observations, namely, from the electric field or ion drift velocity
vector measurements taken along two polar satellite orbits only. These two
satellite passes subdivide the polar cap into several adjacent areas. Measured
electric fields or ion drifts can be considered as boundary conditions (together
with the zero electric potential condition at the low-latitude boundary) for
those areas, and the entire ionospheric convection pattern can be reconstructed
as a solution of the boundary value problem for the stream function without any
preliminary information on ionospheric conductivities. In order to validate the
stream function method, we utilized the IZMIRAN electrodynamic model (IZMEM)
recently calibrated by the DMSP ionospheric electrostatic potential
observations. For the sake of simplicity, we took the modeled electric fields
along the noon-midnight and dawn-dusk meridians as the boundary conditions.
Then, the solution(s) of the boundary value problem (i.e., a reconstructed
potential distribution over the entire polar region) is compared with the
original IZMEM/DMSP electric potential distribution(s), as well as with the
various cross cuts of the polar cap. It is found that reconstructed convection
patterns are in good agreement with the original modelled patterns in both the
northern and southern polar caps. The analysis is carried out for the winter and
summer conditions, as well as for a number of configurations of the
interplanetary magnetic field.
Key words: Ionosphere (electric fields and currents;
plasma convection; modelling and forecasting) |
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