Survey of magnetosonic waves and proton ring distributions in the Earth's inner magnetosphere
Survey of magnetosonic waves and proton ring distributions in the Earth's inner magnetosphere
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DOI：
10.1029/2007ja012975
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发表时间：
2008-06
影响因子：
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通讯作者：
N. Meredith;R. Horne;R. R. Anderson-R.
中科院分区：
文献类型：
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作者：
N. Meredith;R. Horne;R. R. Anderson-R.
[1]快磁声波可以在1-2 d的时间尺度上导致电子从10 keV到几MeV的局部加速，并可能在辐射带动力学中起重要作用。在这里，我们提出了一个调查的波和粒子的数据从组合释放和辐射效应卫星（CRRES），以确定全球形态的波作为磁活动的函数，并调查质子环作为一个潜在的源机制的作用。不稳定性所需的频率范围0.5 fLHR EA）内的快磁声波强度与黄昏侧等离子体层顶内外的磁声波分布密切匹配，表明低能质子环可能是驱动波的能量来源。然而，强烈的磁声波也观察到以外的等离子体层顶的黎明侧，不满足（ER > EA）。虽然ER > 30 keV的质子环可以驱动不稳定性，但这些波的来源尚未被正确识别。由于快磁声波可以加速电子，我们认为，它们可能提供了一个显着的能量转移过程之间的环电流和外部电子辐射带。
[1] Fast magnetosonic waves can lead to the local acceleration of electrons from ∼10 keV up to a few MeV on a timescale of 1–2 d and may play an important role in radiation belt dynamics. Here we present a survey of wave and particle data from the Combined Release and Radiation Effects Satellite (CRRES) to determine the global morphology of the waves as a function of magnetic activity, and to investigate the role of proton rings as a potential source mechanism. The intensity of fast magnetosonic waves in the frequency range 0.5 fLHR EA) required for instability closely matches the distribution of magnetosonic waves on the dusk side, both inside and outside the plasmapause, suggesting that low energy proton rings are a likely source of energy driving the waves. However, intense magnetosonic waves are also observed outside the plasmapause on the dawn-side that do not satisfy (ER > EA). Although proton rings with ER > 30 keV could drive the instabilities, the source of these waves is yet to be properly identified. Since fast magnetosonic waves can accelerate electrons we suggest that they may provide a significant energy transfer process between the ring current and the outer electron radiation belt.