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Titolo: Modeling the properties of highm Alfven waves driven by the driftbounce resonance mechanism
Autore: Ozeke, LG; Mann, IR;
 Indirizzi:
 Univ York, Dept Phys, York YO1 5DD, N Yorkshire, England Univ York York NYorkshire England YO1 5DD YO1 5DD, N Yorkshire, England
 Titolo Testata:
 JOURNAL OF GEOPHYSICAL RESEARCHSPACE PHYSICS
fascicolo: A8,
volume: 106,
anno: 2001,
pagine: 15583  15597
 SICI:
 01480227(20010801)106:A8<15583:MTPOHA>2.0.ZU;2W
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 FIELD LINE RESONANCES; GIANT PULSATIONS PGS; GEOMAGNETICPULSATIONS; ION COMPOSITION; STARE RADAR; ULF WAVES; MAGNETOSPHERE; LATITUDE; MAGNETOPAUSE; PLASMAPAUSE;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Physical, Chemical & Earth Sciences
 Citazioni:
 40
 Recensione:
 Indirizzi per estratti:
 Indirizzo: Ozeke, LG Univ York, Dept Phys, York YO1 5DD, N Yorkshire, England Univ York York N Yorkshire England YO1 5DD N Yorkshire, England



 Citazione:
 L.G. Ozeke e I.R. Mann, "Modeling the properties of highm Alfven waves driven by the driftbounce resonance mechanism", J GEO RS P, 106(A8), 2001, pp. 1558315597
Abstract
Highm Alfven waves can be driven by driftbounce resonance with energeticprotons in the magnetosphere. We calculate the trajectories of protons in a dipole magnetosphere, including the effects of corotation and convection electric fields. We propose that the boundary between open and closed orbits, following a particle injection, can represent a region where unstable particle distributions with df/dW > 0 can develop. Hence we can model the energetically favorable locations in particle energy, W, and L shell space forhighm wave growth by finding the positions where the openclosed orbit boundary intersects a driftbounce resonance curve. Our model carl provide a physical explanation for the observed asymmetry between the properties of highm Alfven waves in the morning and afternoon sectors, and it predicts wave properties which are in excellent agreement with observations. In particular, the observed properties of stormtime Pc5 waves in the afternoon sector and giant pulsations (Pgs) in the morning sector are in excellent agreement with our model, these waves predicted to be fundamental (N = 0) and second harmonic (N = 1) resonances, respectively. Moreover, our model can explain why Pgs are so monochromatic, so highly localized in latitude, and onlyproduced in the auroral zone.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/04/20 alle ore 22:57:51