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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Optimization of Radial Diffusion Coefficients for the Proton Radiation Belt During the CRRES Era
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Optimization of Radial Diffusion Coefficients for the Proton Radiation Belt During the CRRES Era

机译：优化的径向扩散系数在退休研究中心时代质子辐射带

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摘要

Proton flux measurements from the Proton Telescope instrument aboard the CRRES satellite are revisited, and used to drive a radial diffusion model of the inner proton belt at 1.1 ≤ L ≤ 1.65. Our model utilizes a physics-based evaluation of the cosmic ray albedo neutron decay (CRAND) source, and coulomb collisional loss is driven by a drift averaged density model combining results from the International Reference Ionosphere, NRLMSIS-00 atmosphere and Radio Plasma Imager plasmasphere models, parameterized by solar activity and season. We drive our model using time-averaged data at L = 1.65 to calculate steady state profiles of equatorial phase space density, and optimize our choice of radial diffusion coefficients based on four defining parameters to minimize the difference between model and data. This is first performed for a quiet period when the belt can be assumed to represent steady state. Additionally, we investigate fitting steady state solutions to time averages taken during active periods where the data exhibits limited deviation from steady state, demonstrated by CRRES measurements following the March 24, 1991 storm. We also discuss a way to make the optimization process more reliable by excluding periods of variability in plasmaspheric density from any time average. Lastly, we compare our resultant diffusion coefficients to those derived via a similar process in previous work, and diffusion coefficients derived for electrons from ground and in situ observations. We find that higher diffusion coefficients are derived compared with previous work, and suggest more work is required to derive proton diffusion coefficients for different geomagnetic activity levels.
机译：从质子质子通量测量望远镜卫星仪器上哭泣重新审视,用于驱动一个径向扩散模型内部的质子带1.1≤≤1.65。我们的模型利用一个基于物理原理的评价宇宙射线反照率中子衰变(通道)源,是由库仑碰撞引起的损失漂移平均密度模型相结合的结果从国际参考电离层,NRLMSIS-00大气和无线电等离子体成像由太阳能等离子体层模型、参数化活动和季节。定数据L = 1.65计算稳态赤道相空间的配置文件密度、径向和优化我们的选择基于四个定义的扩散系数参数之间的差异降到最低模型和数据。当皮带可以认为平静的时期代表稳定状态。调查拟稳态解时间平均活跃时期,展览有限公司偏离稳定的数据crr状态,证明了测量在1991年3月24日,风暴。讨论一个方法,使优化过程扣除时间的可变性更可靠从任何时间平均plasmaspheric密度。最后,我们比较合成扩散通过相似系数的推导在以往的研究中,和扩散过程系数导出电子从地面和原位观察。扩散系数与派生而来以前的工作,建议更多的工作是必需的获得质子扩散系数不同的地磁活动水平。

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