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We investigate the evolution of the phase space density (PSD) of ring current protons induced by electromagnetic ion cyclotron (EMIC) waves at the location L=3.5, calculate the diffusion coefficients in pitch angle and momentum, and solve the standard two-dimensional Fokker-Planck diffusion equation. The pitch angle diffusion coefficient is found to be larger than the momentum diffusion coefficient by a factor of about 103 or above at lower pitch angles. We show that EMIC waves can produce efficient pitch angle scattering of energetic (- 100 keV) protons, yielding a rapid decrement in PSD, typically by a factor of - 10 within a few hours, consistent with observational data. This result further supports previous findings that wave-particle interaction is responsible for the rapid ring current decay. 相似文献
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以水合肼为还原剂采用液相预还原-冷冻干燥-固相充分还原的方法制备的石墨烯电极材料具有十分优越的电化学性能,在超级电容器中比电容值达到336F·g-1(10 mV·s-1,循环伏安法),较液相还原石墨烯(270F·g-1)提高24%,同时亦优于固相还原石墨烯(323 F·g-1).对液相预还原氧化石墨烯采取冷冻干燥,既避免了液相直接还原干燥过程中的团聚现象,同时也有效地增加了固相还原石墨烯的无序度,从而进一步提高了石墨烯的电化学性能. 相似文献
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研究了三氧杂环己烷在不同浓度、不同温度和不同酸度时于光滑铂电极上的电化学行为, 初步分析了三氧杂环己烷的反应机理. 相似文献
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Bounce-averaged Pitch-angle Diffusion by Electromagnetic Ion Cyclotron Waves in Multi-ion Plasmas 下载免费PDF全文
We present a study on the gyroresonant interaction particles in multi-ion (H^+, He^+, and O^+) plasmas between electromagnetic ion cyclotron waves and ring current We provide a first evaluation of the bounce-averaged pitch angle diffusion coefficient 〈Dαα〉 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, 〈Dαα〉 can approach - 10^-4 s^-1 for ion H^+, and - 5 × 10^-5 s^-1 /or ion He^+; meanwhile, in the O^+-band, 〈Dαα〉 can reach - 10^-5 s^-1 for ions He^+ and O^+. The results above show that the EMIC wave can efficiently produce precipitation loss of energetic (- 100 keV) ions (H^+, He^+ and even O^+), and such a wave tends to be a serious candidate responsible for the ring current decay. 相似文献
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