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| Titel |
Magnetic guide field generation in collisionless current sheets |
| VerfasserIn |
W. Baumjohann, R. Nakamura, R. A. Treumann |
| 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. 3 ; Nr. 28, no. 3 (2010-03-16), S.789-793 |
| Datensatznummer |
250016803
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| Publikation (Nr.) |
 copernicus.org/angeo-28-789-2010.pdf |
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| Zusammenfassung |
| In thin (Δ< few λi) collisionless current sheets
in a space plasma like the magnetospheric tail or magnetopause current layer,
magnetic fields can grow from thermal fluctuation level by the action of the non-magnetic Weibel
instability (Weibel, 1959). The instability is driven by the counter-streaming electron
inflow from the "ion diffusion" (ion inertial Hall) region into the inner current (electron
inertial) region after thermalisation by the two-stream instability. Under magnetospheric
tail conditions it takes ~50 e-folding times (~100 s) for the Weibel field to
reach observable amplitudes |bW|~1 nT. In counter-streaming inflows these fields are of guide field type. |
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