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| Titel |
Flux quanta, magnetic field lines, merging – some sub-microscale relations of interest in space plasma physics |
| VerfasserIn |
R. A. Treumann, R. Nakamura, W. Baumjohann |
| 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 ; 29, no. 6 ; Nr. 29, no. 6 (2011-06-25), S.1121-1127 |
| Datensatznummer |
250017046
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1121-2011.pdf |
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| Zusammenfassung |
| We clarify the notion of magnetic field lines in plasma by referring to
sub-microscale (quantum mechanical) particle dynamics. It is demonstrated
that magnetic field lines in a field of strength B carry single magnetic
flux quanta Φ0=h/e. The radius of a field line in the given magnetic
field B is calculated. It is shown that such field lines can merge and
annihilate only over the length ℓ∥ of their strictly anti-parallel
sections, for which case we estimate the power generated. The length
ℓ∥ becomes a function of the inclination angle θ of the two
merging magnetic flux tubes (field lines). Merging is possible only in the
interval 12πθ≤π. This provides a sub-microscopic
basis for "component reconnection" in classical macro-scale reconnection.
We also find that the magnetic diffusion coefficient in plasma appears in
quanta D0m=eΦ0/me=h/me. This lets us conclude that the bulk
perpendicular plasma resistivity is limited and cannot be less than
η0⊥=μ0eΦ0/me=μ0h/me~10−9 Ohm m. This
resistance is an invariant. |
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