The study of ratio α (=λ_⊥/λ_||) of galactic cosmic ray (GCR) free paths normal (λ_⊥) and parallel (λ_||) to the mean interplanetary magnetic field (IMF) B is continued with annual mean GCR solar diurnal anisotropy (SDA) data of the Cheltenham/Fredericksburg shielded ion chamber (CH-IC) for 1936–1977 previously analyzed by Bieber and Chen (1991) but not corrected for atmospheric temperature effect. This study uses CH-IC data corrected for temperature effect to calculate α for the first time assuming negligible latitudinal density gradient. Solar activity dependence of α shown by Bieber and Chen (BC) remains qualitatively unchanged. Present GCR modulation theories do not provide guidance for α, its rigidity or solar cycle dependence. Flat heliosphere current sheet (HCS) and Master equations derived by Ahluwalia and Dorman (1997) are used for computing α and study its rigidity dependence and correlation with solar activity for positive (p) and negative (n) polarity intervals of B at 1 AU; B points outward/ inward from the Sun during p/n interval in Northern hemisphere, IMF polarity changes sign near sunspot number (SSN) maximum. CH-IC median rigidity of response (Rm) for GCR differential spectrum is 67 GV. We show that computed α is high for p- and low for n-intervals, also α is low near SSN maximum and high near SSN minimum when effective limiting GCR rigidity (Rc) for SDA is known to be <100 GV. The results are consistent with those reported earlier by Ahluwalia and Modzelewska (2020) for NagV-MT (Rm = 60 GV) for 1971–2017; they challenge validity of present conceptual understanding of GCR modulation processes in the heliosphere, pointing to a great need to develop an acceptable modulation theory to explain empirical results reported in this paper.

继续研究银河宇宙射线 (GCR) 自由路径法向 (λ _⊥ ) 和平行 (λ _|| ) 与平均行星际磁场 (IMF) B的比值α (=λ _⊥ /λ _|| ) 的年平均值1936-1977 年切尔滕纳姆/弗雷德里克斯堡屏蔽离子室 (CH-IC) 的 GCR 太阳日各向异性 (SDA) 数据之前由 Bieber 和 Chen (1991) 分析，但未针对大气温度效应进行校正。本研究首次使用针对温度影响校正的 CH-IC 数据计算α，假设纬度密度梯度可忽略不计。α 的太阳活动依赖性Bieber 和 Chen (BC) 所展示的内容在质量上保持不变。目前的 GCR 调制理论没有为α、其刚性或太阳周期依赖性提供指导。平坦的日光层电流片 (HCS) 和由 Ahluwalia 和 Dorman (1997) 推导出的主方程用于计算α并研究其刚度依赖性和与太阳活动的相关性，用于1 AU处B 的正 (p) 和负 (n) 极性间隔; 在北半球的 p/n 间隔期间，B从太阳向外/向内指向，IMF 极性在太阳黑子数 (SSN) 最大值附近发生变化。GCR 微分谱的 CH-IC 响应刚性中值 (Rm) 为 67 GV。我们表明，计算出的α对于 p 区间是高的，对于 n 区间是低的，同样当已知 SDA 的有效限制 GCR 刚度 (Rc) <100 GV 时，α在 SSN 最大值附近较低，而在 SSN 最小值附近较高。结果与 Ahluwalia 和 Modzelewska（2020）早先报告的 1971-2017 年 NagV-MT（Rm = 60 GV）的结果一致；他们挑战了目前对日光层中 GCR 调制过程的概念理解的有效性，表明非常需要开发一种可接受的调制理论来解释本文报告的实证结果。