Modeling the properties of high-m Alfvén waves driven by the drift-bounce resonance mechanism

Details Modeling the properties of high-m Alfvén waves driven by the drift-bounce resonance mechanism Modeling the properties of high-m Alfvén waves driven by the drift-bounce resonance mechanism

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10615583o&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A8, p. 15583-15598

Physics

12

Magnetospheric Physics: Energetic Particles, Trapped, Magnetospheric Physics: Magnetosheath, Magnetospheric Physics: Mhd Waves And Instabilities

Scientific paper

High-m Alfvén waves can be driven by drift-bounce resonance with energetic protons 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 for high-m wave growth by finding the positions where the open-closed orbit boundary intersects a drift-bounce resonance curve. Our model can provide a physical explanation for the observed asymmetry between the properties of high-m Alfvén 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 only produced in the auroral zone.

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