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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >An Empirical Modification of the Force Field Approach to Describe the Modulation of Galactic Cosmic Rays Close to Earth in a Broad Range of Rigidities
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An Empirical Modification of the Force Field Approach to Describe the Modulation of Galactic Cosmic Rays Close to Earth in a Broad Range of Rigidities

机译：实证力场的修改描述银河的调制方法宇宙射线在广泛的接近地球刚性

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摘要

On their way through the heliosphere, galactic cosmic rays (GCRs) are modulated by various effects before they can be detected at Earth. This process can be described by the Parker equation, which calculates the phase space distribution of GCRs depending on the main modulation processes: convection,drifts, diffusion, and adiabatic energy changes. A first-order approximation of this equation is the force field approach, reducing it to a one-parameter dependency, the solar modulation potential ?. Utilizing this approach, it is possible to reconstruct ? from ground-based and spacecraft measurements. However,it has been shown previously that ? depends not only on the local interstellar spectrum (LIS) but also on the energy range of interest. We have investigated this energy dependence further, using published proton intensity spectra obtained by PAMELA and heavier nuclei measurements from IMP-8 and ACE/CRIS. Our results show severe limitations at lower energies including a strong dependence on the solar magnetic epoch. Based on these findings, we will outline a new tool to describe GCR proton spectra in the energy range from a few hundred MeV to tens of GeV over the last solar cycles. In order to show the importance of our modification, we calculate the global production rates of the cosmogenic radionuclide 10Be which is a proxy for the solar activity ranging back thousands of years.
机译：通过日球层,银河宇宙射线(GCRs)是由不同的调制影响地球才能被检测到。这个过程可以被描述为帕克方程,计算相空间GCRs取决于主要的分布调制过程:对流、飘,扩散,绝热能量变化。这个方程的一阶近似力场的方法,减少到一个单参数依赖性,太阳能灯潜在的?。可能的重建?航天器测量。显示之前?本地星际光谱(LIS)还在感兴趣的能量范围。这种能量的依赖进一步,利用出版质子强度帕梅拉和获得的光谱从IMP-8和重核测量ACE /短剑。低能量包括强烈的依赖太阳磁时代。结果,我们将概述一个新的工具来描述GCR质子光谱能量范围从几个几百兆电子伏数万GeV过去太阳能周期。修改,我们计算全球生产利率的宇宙发生的放射性核素10是哪个是一个太阳活动的代理范围吗数千年。

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