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| Titel |
Defining and resolving current systems in geospace |
| VerfasserIn |
N. Y. Ganushkina, M. W. Liemohn, S. Dubyagin, I. A. Daglis, I. Dandouras, D. L. De Zeeuw, Y. Ebihara, R. Ilie, R. Katus, M. Kubyshkina, S. E. Milan, S. Ohtani, N. Østgaard, J. P. Reistad, P. Tenfjord, F. Toffoletto, S. Zaharia, O. Amariutei |
| 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 ; 33, no. 11 ; Nr. 33, no. 11 (2015-11-10), S.1369-1402 |
| Datensatznummer |
250121267
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| Publikation (Nr.) |
 copernicus.org/angeo-33-1369-2015.pdf |
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| Zusammenfassung |
| Electric currents flowing through near-Earth space (R ≤ 12 RE) can support
a highly distorted magnetic field topology, changing particle drift paths and
therefore having a nonlinear feedback on the currents themselves. A number of
current systems exist in the magnetosphere, most commonly defined as (1) the
dayside magnetopause Chapman–Ferraro currents, (2) the Birkeland field-aligned
currents with high-latitude "region 1" and lower-latitude "region 2"
currents connected to the partial ring current, (3) the magnetotail currents,
and (4) the symmetric ring current. In the near-Earth nightside region,
however, several of these current systems flow in close proximity to each
other. Moreover, the existence of other temporal current systems, such as the substorm current wedge or "banana" current, has been reported. It is very
difficult to identify a local measurement as belonging to a specific system.
Such identification is important, however, because how the current closes and
how these loops change in space and time governs the magnetic topology of the
magnetosphere and therefore controls the physical processes of geospace.
Furthermore, many methods exist for identifying the regions of near-Earth space
carrying each type of current. This study presents a robust collection of these
definitions of current systems in geospace, particularly in the near-Earth
nightside magnetosphere, as viewed from a variety of observational and
computational analysis techniques. The influence of definitional choice on the
resulting interpretation of physical processes governing geospace dynamics is
presented and discussed. |
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