We present a signed measure analysis of compressible Hall magnetohydrodynamic turbulence with an external guide field. Signed measure analysis allows us to characterize the scaling behavior of the sign-oscillating flow structures and their geometrical properties (fractal dimensions of structures). A reduced numerical model, valid when a strong guide magnetic field is present, is used here. In order to discuss the effect of the Hall term, different values for the ion skin depth are considered in the simulations. Results show that as the Hall term is increased, the fractal dimension of the current and vorticity sheets decreases. This observation, together with previous analysis of the same fields, provides a comprehensive description of the effect of the Hall force on the formation of structures. Two main processes are identified, namely, the widening and unraveling of the sheets.

Martin, L.n., De Vita, G., Sorriso-Valvo, L., Dmitruk, P., Nigro, G., Primavera, L., et al. (2013). Cancellation properties in Hall magnetohydrodynamics with a strong guide magnetic field. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR AND SOFT MATTER PHYSICS, 88(6) [10.1103/PhysRevE.88.063107].

Cancellation properties in Hall magnetohydrodynamics with a strong guide magnetic field

De Vita, G.;Nigro, G.;
2013-01-01

Abstract

We present a signed measure analysis of compressible Hall magnetohydrodynamic turbulence with an external guide field. Signed measure analysis allows us to characterize the scaling behavior of the sign-oscillating flow structures and their geometrical properties (fractal dimensions of structures). A reduced numerical model, valid when a strong guide magnetic field is present, is used here. In order to discuss the effect of the Hall term, different values for the ion skin depth are considered in the simulations. Results show that as the Hall term is increased, the fractal dimension of the current and vorticity sheets decreases. This observation, together with previous analysis of the same fields, provides a comprehensive description of the effect of the Hall force on the formation of structures. Two main processes are identified, namely, the widening and unraveling of the sheets.
2013
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/05
English
Martin, L.n., De Vita, G., Sorriso-Valvo, L., Dmitruk, P., Nigro, G., Primavera, L., et al. (2013). Cancellation properties in Hall magnetohydrodynamics with a strong guide magnetic field. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR AND SOFT MATTER PHYSICS, 88(6) [10.1103/PhysRevE.88.063107].
Martin, Ln; De Vita, G; Sorriso-Valvo, L; Dmitruk, P; Nigro, G; Primavera, L; Carbone, V
Articolo su rivista
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/364774
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 14
  • ???jsp.display-item.citation.isi??? 15
social impact