Bounce-averaged Pitch-angle Diffusion by Electromagnetic Ion Cyclotron Waves in Multi-ion Plasmas
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Abstract
We present a study on the gyroresonant interaction between electromagnetic ion cyclotron waves and ring current particles in multi-ion (H+, He+, and O+) plasmas. We provide a first evaluation of the bounce-averaged pitch angle diffusion coefficient αα> for three typical energies of 50, 100 and 150keV at L≈3.5, the heart of the symmetrical ring current. We show that in the H+-band and He+-band, αα> can approach ~10-4s-1 for ion H+, and ~5× 10-5s-1 for ion He+; meanwhile, in the O+-band, αα> can reach ~10-5s-1 for ions He+ and O+. The results above show that the EMIC wave can efficiently produce precipitation loss of energetic (~100keV) ions (H+, He+ and even O+), and such a wave tends to be a serious candidate responsible for the ring current decay.
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XIAO Fu-Liang, TIAN Tian, CHEN Liang-Xu. Bounce-averaged Pitch-angle Diffusion by Electromagnetic Ion Cyclotron Waves in Multi-ion Plasmas[J]. Chin. Phys. Lett., 2009, 26(5): 059402. DOI: 10.1088/0256-307X/26/5/059402
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XIAO Fu-Liang, TIAN Tian, CHEN Liang-Xu. Bounce-averaged Pitch-angle Diffusion by Electromagnetic Ion Cyclotron Waves in Multi-ion Plasmas[J]. Chin. Phys. Lett., 2009, 26(5): 059402. DOI: 10.1088/0256-307X/26/5/059402
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XIAO Fu-Liang, TIAN Tian, CHEN Liang-Xu. Bounce-averaged Pitch-angle Diffusion by Electromagnetic Ion Cyclotron Waves in Multi-ion Plasmas[J]. Chin. Phys. Lett., 2009, 26(5): 059402. DOI: 10.1088/0256-307X/26/5/059402
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XIAO Fu-Liang, TIAN Tian, CHEN Liang-Xu. Bounce-averaged Pitch-angle Diffusion by Electromagnetic Ion Cyclotron Waves in Multi-ion Plasmas[J]. Chin. Phys. Lett., 2009, 26(5): 059402. DOI: 10.1088/0256-307X/26/5/059402
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