当前位置:
X-MOL 学术
›
Space Weather
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Long‐Term Observations of Galactic Cosmic Ray LET Spectra in Lunar Orbit by LRO/CRaTER
Space Weather ( IF 4.288 ) Pub Date : 2020-11-04 , DOI: 10.1029/2020sw002543 M. D. Looper 1 , J. E. Mazur 1 , J. B. Blake 1 , H. E. Spence 2 , N. A. Schwadron 2 , J. K. Wilson 2 , A. P. Jordan 2 , C. Zeitlin 3 , A. W. Case 4 , J. C. Kasper 5, 6 , L. W. Townsend 7 , T. J. Stubbs 8
Space Weather ( IF 4.288 ) Pub Date : 2020-11-04 , DOI: 10.1029/2020sw002543 M. D. Looper 1 , J. E. Mazur 1 , J. B. Blake 1 , H. E. Spence 2 , N. A. Schwadron 2 , J. K. Wilson 2 , A. P. Jordan 2 , C. Zeitlin 3 , A. W. Case 4 , J. C. Kasper 5, 6 , L. W. Townsend 7 , T. J. Stubbs 8
Affiliation
The Cosmic Ray Telescope for the Effects of Radiation (CRaTER) has been orbiting the Moon since 2009 aboard the Lunar Reconnaissance Orbiter (LRO). From this vantage point, it samples the interplanetary energetic particle population outside the shielding of the Earth's magnetosphere. We report the sensor's observations of galactic cosmic rays (GCRs) over a complete solar activity cycle. CRaTER is designed primarily to measure not the spectra of GCR particles outside the sensor but rather their effects on matter, and in particular, it measures the linear energy transfer (LET) or energy‐deposit spectrum in its silicon detectors. We have used the Geant4 radiation‐transport code to devise a background‐rejection algorithm to improve these measurements of LET under 9.9 g/cm2 of shielding, and the resulting observations show the changing radiation effects of GCRs as their intensity and spectrum vary with solar modulation. As of 2020 this intensity, after declining during solar maximum activity, has recovered to a level that exceeds by a few percent the historically high values seen during the deep solar minimum at the start of the LRO mission in 2009.
中文翻译:
LRO / CRaTER对月球轨道上银河系宇宙射线LET光谱的长期观测
自2009年以来,辐射效应宇宙射线望远镜(CRaTER)一直在登月侦察轨道器(LRO)上绕月球飞行。从这个有利的角度,它对地球磁层屏蔽层之外的行星际高能粒子群进行了采样。我们报告了整个太阳活动周期中传感器对银河系宇宙射线(GCR)的观察。CRaTER的主要设计目标不是测量传感器外部的主要GCR粒子的光谱,而是测量其对物质的影响,尤其是它可以测量其硅探测器中的线性能量转移(LET)或能量沉积光谱。我们已经使用Geant4辐射传输代码设计了背景抑制算法,以改善9.9 g / cm 2以下LET的这些测量结果结果表明,GCR的强度和光谱随太阳调制的变化而变化。到2020年,在太阳最大活动期间强度下降之后,这一强度已恢复到超过2009年LRO任务开始时太阳深度最小时所见的历史最高值的几个百分点。
更新日期:2020-12-02
中文翻译:
LRO / CRaTER对月球轨道上银河系宇宙射线LET光谱的长期观测
自2009年以来,辐射效应宇宙射线望远镜(CRaTER)一直在登月侦察轨道器(LRO)上绕月球飞行。从这个有利的角度,它对地球磁层屏蔽层之外的行星际高能粒子群进行了采样。我们报告了整个太阳活动周期中传感器对银河系宇宙射线(GCR)的观察。CRaTER的主要设计目标不是测量传感器外部的主要GCR粒子的光谱,而是测量其对物质的影响,尤其是它可以测量其硅探测器中的线性能量转移(LET)或能量沉积光谱。我们已经使用Geant4辐射传输代码设计了背景抑制算法,以改善9.9 g / cm 2以下LET的这些测量结果结果表明,GCR的强度和光谱随太阳调制的变化而变化。到2020年,在太阳最大活动期间强度下降之后,这一强度已恢复到超过2009年LRO任务开始时太阳深度最小时所见的历史最高值的几个百分点。