Numerical and experimental evidence for a new interpretation of residence times in space
Numerical and experimental evidence for a new interpretation of residence times in space
复制标题
对空间停留时间新解释的数值和实验证据
DOI：
10.1051/0004-6361/202038980
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发表时间：
2022
影响因子：
6.5
通讯作者：
Herbst
中科院分区：
文献类型：
--
作者：
Engelbrecht;Herbst
目标我们研究木星电子停留时间的能量依赖性，这使得人们能够更深入地了解带电粒子传输过程中发生的绝热能量变化及其对模拟方法的重要性。因此，我们寻求通过研究对先前分析方法的影响以及航天器数据可检测到的可能影响，进一步验证一种改进的数值估计停留时间的方法。方法利用基于 CUDA 编写的随机微分方程 (SDE) 求解器的传播模型，计算木星电子源光谱主导的整个能量范围内的木星电子停留时间。我们分析了观察者和源之间的磁连接以及退出（模拟）时间分布和由此产生的停留时间之间的相互依赖性。结果我们指出了不同动能的停留时间与通常在木星电子中观察到的 13 个月周期的纵向位移之间的线性关系，并讨论了这些发现对数据的适用性。此外，我们利用我们的发现，即模拟的停留时间与木星和银河电子的能量损失近似线性相关，并且我们开发了一种改进的分析估计，与数值停留时间和测量观察到的纵向位移一致。
AimsWe investigate the energy dependence of Jovian electron residence times, which allows for a deeper understanding of adiabatic energy changes that occur during charged particle transport, as well as of their significance for simulation approaches. Thereby we seek to further validate an improved approach to estimate residence times numerically by investigating the implications on previous analytical approaches and possible effects detectable by spacecraft data.MethodsUtilising a propagation model based on a stochastic differential equation (SDE) solver written in CUDA, residence times for Jovian electrons were calculated over the whole energy range dominated by the Jovian electron source spectrum. We analysed the interdependences both with the magnetic connection between the observer and the source as well as between the distribution of the exit (simulation) times and the resulting residence times.ResultsWe point out a linear relation between the residence time for different kinetic energies and the longitudinal shift of the 13 month periodicity typically observed for Jovian electrons and discuss the applicability of these findings to data. Furthermore, we utilise our finding that the simulated residence times are approximately linearly related to the energy loss for Jovian and Galactic electrons, and we develop an improved analytical estimation in agreement with the numerical residence time and the longitudinal shift observed by measurements.