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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Measurement and simulation of neutronmonitor count rate dependence on surrounding structure
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Measurement and simulation of neutronmonitor count rate dependence on surrounding structure

机译：测量和模拟neutronmonitor计数速率依赖周围的结构

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摘要

Neutron monitors are the premier instruments for precise measurements of time variations (e.g., of solar origin) in the galactic cosmic ray (GCR) flux in the range of ～1–100 GeV. However, it has proven challenging to accurately determine the yield function (effective area) versus rigidity in order to relate a neutron monitor's count rate with those of other monitors worldwide and the underlying GCR spectrum. Monte Carlo simulations of the yield function have been developed, but there have been few opportunities to validate these observationally, especially regarding the particular environment surrounding each monitor. Here we have precisely measured the count rate of a calibration neutron monitor near the Princess Sirindhorn Neutron Monitor (PSNM) at Doi Inthanon, Thailand (18.59°N, 98.49°E, 2560 m altitude), which provides a basis for comparison with count rates of other neutron monitors worldwide that are similarly calibrated. We directly measured the effect of surrounding structure by operating the calibrator outside and inside the building. Using Monte Carlo simulations, we clarify differences in response of the calibrator and PSNM, as well as the calibrator outside and inside the building. The dependence of the calibrator count rate on surrounding structure can be attributed to its sensitivity to neutrons of 0.5–10 MeV and a shift of sensitivity to nucleons of higher energy when placed inside the building. Simulated calibrator to PSNM count rate ratios inside and outside agree with observations within a few percent, providing useful validation and improving confidence in our ability to model the yield function for a neutron monitor station.
机译：中子监测器英超仪器精确测量(例如,时间的变化太阳能起源)的银河宇宙射线(GCR)通量~ 1 - 100 GeV的范围。证明难以准确确定屈服函数(有效面积)与刚性为了与中子监测器的计数率与其他全球和监视器潜在的GCR频谱。屈服函数的方法已被开发,但是很少有机会来验证这些根据观察,尤其是有关特定的环境周围的每个monitor。这里我们有精确测量的计数率附近的一个校准中子监测器的公主在Doi诗琳通中子监测器(PSNM)Inthanon、泰国(18.59°N, 98.49°E, 2560米高度),它提供了一种比较的基础率计算的其他中子监测器在全球范围内同样的校准。直接测量周围的影响通过操作外的校准器和结构内部的建筑。模拟,我们澄清不同的反应校准器和PSNM以及校准器内外。依赖的校准器计数率可以归因于其周围结构对中子的敏感性为0.5 -10伏和转变的核子能量更高的灵敏度放置在建筑物。内外PSNM计数率比值同意在几个百分点的观察,提供有用的验证和改进自信在我们的模型的收益的能力函数一个中子监测器。

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