Comparing Electron Precipitation Fluxes Calculated From Pitch Angle Diffusion Coefficients to LEO Satellite Observations
Comparing Electron Precipitation Fluxes Calculated From Pitch Angle Diffusion Coefficients to LEO Satellite Observations
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DOI：
10.1029/2020ja028410
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发表时间：
2021-02
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影响因子：
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通讯作者：
J. A. Reidy;R. Horne;S. Glauert;M. Clilverd;N. Meredith;E. Woodfield;J. Ross;H. Allison;C. Rodger
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文献类型：
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作者：
J. A. Reidy;R. Horne;S. Glauert;M. Clilverd;N. Meredith;E. Woodfield;J. Ross;H. Allison;C. Rodger
粒子沉淀是来自辐射带的损失机制，其中被地球磁场捕获的粒子由于波粒相互作用而散射到损失锥中。高能电子沉淀产生臭氧破坏化学物质，这些化学物质可以影响极地地区的温度，因此准确量化这种对地球大气的影响至关重要。我们使用反弹平均俯仰角扩散系数哨声模式合唱波，等离子体层嘶嘶声和大气碰撞计算磁本地时间（MLT）依赖的电子沉淀内的极轨环境卫星（POES）T0探测器的视场，2013年3月26日至30日。这些扩散系数用于BAS辐射带模型（BAS‐RBM），本文是通过与真实的世界数据进行比较来测试该模型中损失的第一步。我们发现，对于>30 keV的电子通道，在黎明侧L* > 5处计算的和测量的T0沉淀之间的最佳一致性，与较低波段合唱驱动的沉淀一致。需要额外的扩散来解释更高能量和黄昏侧的通量。POES T0探测器低估了电子沉淀，因为它的视场不能测量整个损失锥。我们证明了利用扩散系数重建整个损失锥的沉淀通量的潜力。我们的研究结果表明，总沉淀可以超过POES >30 keV电子通道测量的一个因素，通常从1到10变化的L* = 6，6.5，和7。
Particle precipitation is a loss mechanism from the radiation belts whereby particles trapped by the Earth's magnetic field are scattered into the loss cone due to wave‐particle interactions. Energetic electron precipitation creates ozone destroying chemicals which can affect the temperatures of the polar regions, therefore it is crucial to accurately quantify this impact on the Earth's atmosphere. We use bounce‐averaged pitch angle diffusion coefficients for whistler mode chorus waves, plasmaspheric hiss and atmospheric collisions to calculate magnetic local time (MLT) dependent electron precipitation inside the field of view of the Polar Orbiting Environmental Satellites (POES) T0 detector, between 26–30 March 2013. These diffusion coefficients are used in the BAS Radiation Belt Model (BAS‐RBM) and this paper is a first step toward testing the loss in this model via comparison with real world data. We find the best agreement between the calculated and measured T0 precipitation at L* > 5 on the dawnside for the >30 keV electron channel, consistent with precipitation driven by lower band chorus. Additional diffusion is required to explain the flux at higher energies and on the dusk side. The POES T0 detector underestimates electron precipitation as its field of view does not measure the entire loss cone. We demonstrate the potential for utilizing diffusion coefficients to reconstruct precipitating flux over the entire loss cone. Our results show that the total precipitation can exceed that measured by the POES >30 keV electron channel by a factor that typically varies from 1 to 10 for L* = 6, 6.5, and 7.