Magnetic reconnection rate in space plasmas: A fractal approach (Articolo in rivista)

Type
Label
  • Magnetic reconnection rate in space plasmas: A fractal approach (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevLett.99.175002 (literal)
Alternative label
  • Materassi M. (1); Consolini G. (2); (2007)
    Magnetic reconnection rate in space plasmas: A fractal approach
    in Physical review letters (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Materassi M. (1); Consolini G. (2); (literal)
Pagina inizio
  • 175002 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://biblioproxy.cnr.it:2493/abstract/PRL/v99/i17/e175002 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 99 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 4 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1) Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, V. Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy; 2) Istituto di Fisica dello Spazio Interplanetario, Istituto Nazionale di Astrofisica, V. Fosso del Cavaliere 100, I-00133 Roma, Italy; (literal)
Titolo
  • Magnetic reconnection rate in space plasmas: A fractal approach (literal)
Abstract
  • Magnetic reconnection is generally discussed via a fluid description. Here, we evaluate the reconnection rate assuming a fractal topology of the reconnection region. The central idea is that the fluid hypothesis may be violated at the scales where reconnection takes place. The reconnection rate, expressed as the Alfvén Mach number of the plasma moving toward the diffusion region, is shown to depend on the fractal dimension and on the sizes of the reconnection or diffusion region. This mechanism is more efficient than prediction of the Sweet-Parker model and even Petschek's model for finite magnetic Reynolds number. A good agreement also with rates given by Hall MHD models is found. A discussion of the fractal assumption on the diffusion region in terms of current microstructures is proposed. The comparison with in-situ satellite observations suggests the reconnection region to be a filamentary domain. (literal)
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