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Titolo: Electron hole structure and its stability depending on plasma magnetization
Autore: Singh, N; Loo, SM; Wells, E;
 Indirizzi:
 Univ Alabama, Coll Engn, Dept Elect & Comp Engn, Huntsville, AL 35899 USA Univ Alabama Huntsville AL USA 35899 Comp Engn, Huntsville, AL 35899 USA
 Titolo Testata:
 JOURNAL OF GEOPHYSICAL RESEARCHSPACE PHYSICS
fascicolo: A10,
volume: 106,
anno: 2001,
pagine: 21183  21198
 SICI:
 01480227(20011001)106:A10<21183:EHSAIS>2.0.ZU;2O
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 PHASESPACE HOLES; SOLITARY WAVES; BEAM; INSTABILITIES; MAGNETOTAIL; SIMULATIONS; GEOTAIL; REGION; FIELDS; DRIVEN;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Physical, Chemical & Earth Sciences
 Citazioni:
 25
 Recensione:
 Indirizzi per estratti:
 Indirizzo: Singh, N Univ Alabama, Coll Engn, Dept Elect & Comp Engn, Huntsville, AL 35899 USA Univ Alabama Huntsville AL USA 35899 n, Huntsville, AL 35899 USA



 Citazione:
 N. Singh et al., "Electron hole structure and its stability depending on plasma magnetization", J GEO RS P, 106(A10), 2001, pp. 2118321198
Abstract
Observations from Polar have revealed that electron hole (ehole) structure depends on the plasma magnetization determined by the ratio <(<Omega>)over bar> = Omega (e) /omega (pe), where Omega (e) and omega (pe) are the electron cyclotron and plasma frequencies, respectively. Using threedimensional parallel particleincell) simulations, we have studied the formation andstructure of eholes by varying <(<Omega>)over bar> showing that (1) for <(<Omega>)over bar> <1 eholes are highly transitory while for <(<Omega>)over bar> > 1 longlasting eholes form, especially when <(<Omega>)over bar> greater than or equal to 2, (2) in the transitory eholes for <(<Omega>)overbar> < 1, the eholes are essentially planar with parallel electric fieldsEparallel to > > Eperpendicular to, the perpendicular field, (3) when <(<Omega>)over bar> greater than or equal to 2 a variety of structures are possible ranging from spheroidal structures with Ex similar to Ey similar to Eparallel to to a planar one with Ex similar to Ey Eparallel to, where Ex and Ey are the x and y components of the perpendicular field Eperpendicular to. It is also possible that Ex < < Ey similar to Eparallel to. We find that eholes with long transverse structures undergo a perpendicular modulation, which eventually breaks the long structures into fragments of eholes. The fragments are seen to further decay by emitting lower hybrid(LH) waves. A linear model of these instabilities is developed showing an ehole is an effective radiator of plasma waves. An ehole with long transverse structure is effective in radiating highfrequency whistler waves which have long perpendicular wavelengths. When such waves are radiated out, the remnant structure is transversely modulated and has relatively short scale length. On the other hand, the fragments with the short perpendicular scale lengths are effective in radiating the LH waves. These findings from thesimulations are compared with findings from the data from Polar [Franz et al., 2000].
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Documento generato il 30/03/20 alle ore 13:32:35