论文标题
使用长期GPS颗粒测量结果确定中等地球轨道中的电离剂量
Determining Ionizing Doses in Medium Earth Orbits Using Long-Term GPS Particle Measurements
论文作者
论文摘要
我们使用由Los Alamos国家实验室开发的CXD粒子仪器进行的长期电子和质子的原位测量值，并携带了GPS卫星的董事会，以确定由中等地球轨道（MEOS）在自然空间辐射环境中引起的总电离剂量（TID）值（TID）值（TID）值（TID）值（DR）值（MEOS）。在这里，基于测量的TID和DR值在简化的样品几何形状上 - 与经验辐射模型相比，与厚度为1000万的铝屏蔽球中的小（半径为0.1 mm）的硅检测器相比。在太阳周期24中的结果表明，来自GPS轨道中测量值的电子潮流远高于从AE8和AE9模型中的中值/平均值计算出的值，但接近较高百分位数的模型流量。同样，可以证实，在梅斯质子中，质子对泰式的贡献很小，主要由太阳能质子主导。讨论和评估影响这些剂量计算的几个因素。这项研究的结果为我们提供了对现有经验空间辐射模型可靠性的另一项样本外测试，还有助于估计通过地球外辐射带中心的MEO中计算出的剂量值的边缘因子。
We use long-term electron and proton in-situ measurements made by the CXD particle instruments, developed by Los Alamos National Laboratory and carried on board GPS satellites, to determine total ionizing dose (TID) values and daily/yearly dose rate (DR) values in medium Earth orbits (MEOs) caused by the natural space radiation environment. Here measurement-based TID and DR values on a simplified sample geometry--a small (with a radius of 0.1 mm) Silicon detector within an Aluminum shielding sphere with a thickness of 100 mil--are compared to those calculated from empirical radiation models. Results over the solar cycle 24 show that electron TID from measurements in GPS orbit is well above the values calculated from the median/mean fluences from AE8 and AE9 models, but close to model fluences at high percentiles. Also, it is confirmed that in MEOs proton contributions to TID are minor and mainly dominated by solar energetic protons. Several factors affecting those dose calculations are discussed and evaluated. Results from this study provide us another out-of-sample test on the reliability of existing empirical space radiation models, and also help estimate the margin factors on calculated dose values in MEOs that pass through the heart of the Earth's outer radiation belt.
