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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Impact of EMIC-Wave Driven Electron Precipitation on the Radiation Belts and the Atmosphere
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Impact of EMIC-Wave Driven Electron Precipitation on the Radiation Belts and the Atmosphere

机译：EMIC-Wave驱动电子降水的影响辐射带和气氛

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摘要

In recent years, there has been a growing body of direct experimental evidence demonstrating electromagnetic ion cyclotron (EMIC) waves driving energetic electron precipitation (EEP) at unexpectedly low, sub-MeV energies-as low as only a few hundred keV. EMIC-wave driven scattering at these energies has important ramifications for our understanding of not only radiation belt electron dynamics, but also the importance of EMIC-driven EEP to the chemical balance of the Earth's atmosphere. In this study, we use three experimentally derived EMIC-driven EEP flux spectra to investigate the impact of this precipitation on trapped radiation belt fluxes. In doing so, we resolve an apparent contradiction with earlier results derived from trapped electron flux populations that suggested EMIC waves only caused significant scattering at ultrarelativistic energies. We show that strong sub-MeV EEP measurements are not necessarily mutually exclusive with a strongly relativistic-only trapped flux response, as the sub-MEV peak precipitation is comparatively much smaller than the trapped population at those energies. Using a further six EEP spectra, we also demonstrate that EMIC-driven EEP can generate significant ionization of the Earth's atmosphere above 40 km, leading to the loss of mesospheric ozone. We find poor correlation between EMIC-driven EEP fluxes and geomagnetic activity proxies, such that EMIC-driven EEP is likely to be poorly specified in the forcing factors of modern coupled-climate models.
机译：近年来,已经有越来越多的直接的实验证据证明电磁离子回旋波(位的)开车精力充沛电子降水(保留)出乎意料的低,sub-MeV及能量低几百凯文。这些能量具有重要影响我们理解不仅辐射带电子动力,但也的重要性EMIC-driven燃灯的化学平衡地球大气层。实验得出EMIC-driven燃灯通量光谱的影响进行调查降水在困辐射带通量。在这一过程中,我们解决一个明显的矛盾与早期的结果来自被困电子通量人口表明位的波只有重大的散射引起的ultrarelativistic能量。sub-MeV下次测量不一定是强烈的相互排斥relativistic-only困通量响应,sub-MEV降水峰值相对比较多小于被困在这些人口的能量。也证明EMIC-driven燃灯产生显著的电离的地球大气40公里以上,导致的损失中间层的臭氧。EMIC-driven之间保留通量和地磁活动代理,这样EMIC-driven燃灯可能会迫使中指定现代气候的因素模型。

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