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| Titel |
THEMIS observations of plasma transport via eddy diffusion |
| VerfasserIn |
T. Izutsu, M. Fujimoto |
| 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 ; 30, no. 12 ; Nr. 30, no. 12 (2012-12-17), S.1703-1707 |
| Datensatznummer |
250017296
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| Publikation (Nr.) |
 copernicus.org/angeo-30-1703-2012.pdf |
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| Zusammenfassung |
| We provide an event study of THEMIS observations of the low-latitude
boundary layer in the dayside magnetosphere. Simultaneous multipoint
observations obtained on 5 December 2008 show that the magnetosheath-like plasma
in the low-latitude boundary layer is transferred earthward from the
magnetopause. This earthward transport is accompanied by decrease in the
density and fluctuating bulk flow. We calculate the eddy diffusion
coefficients, which can be estimated from the observed velocity data, and
found that the numbers are in good quantitative agreement with the spatial
and time scales of the observed earthward transport signatures. It is shown
that other possible plasma transport processes such as convection or
diffusion induced by plasma wave turbulence are inconsistent with the
observations. Our study strongly suggests that the observed transport is due
to diffusive transport via turbulent eddy motions as is the case of an
ordinary (Navier–Stokes) fluid. |
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