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Titolo:
Modeling the properties of high-m Alfven waves driven by the drift-bounce 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 RESEARCH-SPACE PHYSICS
fascicolo: A8, volume: 106, anno: 2001,
pagine: 15583 - 15597
SICI:
0148-0227(20010801)106:A8<15583:MTPOHA>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIELD LINE RESONANCES; GIANT PULSATIONS PGS; GEOMAGNETIC-PULSATIONS; 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 high-m Alfven waves driven by the drift-bounce resonance mechanism", J GEO R-S P, 106(A8), 2001, pp. 15583-15597

Abstract

High-m Alfven waves can be driven by drift-bounce 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 forhigh-m wave growth by finding the positions where the open-closed orbit boundary intersects a drift-bounce resonance curve. Our model carl provide a physical explanation for the observed asymmetry between the properties of high-m 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 storm-time 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.

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Documento generato il 07/04/20 alle ore 22:57:51