Generation of Lower Hybrid Waves in an Oxygen Dominated Plasma

Details Generation of Lower Hybrid Waves in an Oxygen Dominated Plasma Generation of Lower Hybrid Waves in an Oxygen Dominated Plasma

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm23b1403m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM23B-1403

Physics

2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2768 Plasmasphere, 2772 Plasma Waves And Instabilities (2471), 2774 Radiation Belts

Scientific paper

A previous work considered the generation of ULF waves in the inner Magnetosphere due to a heavy ion ring distribution such as Lithium, Cesium or Barium [Ganguli et al., 2007]. We extend this analysis by considering the generation of Lower-hybrid waves in an Oxygen dominated plasma at R~600km due to a Barium ion ring distribution. In this situation it is possible to generate ion-Bernstein modes or Lower-hybrid waves. We demonstrate the criteria in which Lower-hybrid waves are produced. The growth rate is found to be strongly dependent on the ion thermal velocity. For a broad range of parameters the growth rate γ > ØmegaBa so that the Barium ions are considered to be unmagnetized which simplifies the analysis. The analysis is compared with space experiments done several decades ago. Furthermore we investigate the generation of whistler waves and their propagation into the radiation belts. Ganguli, G., L. Rudakov, M. Mithaiwala, and K. Papadopoulos (2007), Generation and evolution of intense ion cyclotron turbulence by artificial plasma cloud in the magnetosphere, J. Geophys. Res., 112, A06231, doi:10.1029/2006JA012162. * Supported by ONR.

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