Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm31b0317b&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM31B-0317
Physics
2772 Plasma Waves And Instabilities (2471), 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
We will present results of 2-dimensional particle-in-cell simulations in which the impact of ion cyclotron waves on auroral kilometric radiation (AKR) has been studied. It is known that a horseshoe electron distribution function in a strong magnetic field is unstable to modes with frequencies slightly below the electron cyclotron frequency, and can generate AKR. In the presence of an electron beam superimposed on the horseshoe distribution, the system is unstable to ion cyclotron waves with phase velocity parallel to the magnetic field equal to the electron beam velocity. Ion cyclotron waves are often observed near the source region of AKR, and have been predicted to have an influence on AKR. In simulations, we have shown that such a distribution of plasma generates both AKR and ion cyclotron waves. We have found that the parallel electric field in the ion cyclotron wave modulates the energy density of the electrons with the same frequency as the ion cyclotron wave. Forced oscillation of the parallel electric field with the ion cyclotron frequency has been added in the simulations to see the influence of those waves on AKR. We have shown that the growth rate of AKR decreases significantly when the ion cyclotron wave propagates in the same direction as the electron beam. In contrast, the wave propagating in the opposite direction does not weaken the growth of AKR. By changing the mass ratio, we have found that the intensity of the AKR is also modulated by the ion cyclotron wave. In this presentation, we will discuss how the modulation of the electron energy affects the growth of AKR, and how this modulation generates fine structure of AKR.
Bessho Naoki
Bhattacharjee Anirban
Menietti Douglas J.
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