Observation of Complex Time Structures in the Cosmic Ray Fluxes by the Alpha Magnetic Spectrometer on the ISS
Davide Rozza
备注：
Talk presented at the 2019 Meeting of the Division of Particles and Fields of the American Physical Society (DPF2019), July 29 - August 2, 2019, Northeastern University, Boston, C1907293
We present high-statistics, precision measurements by AMS of the detailed time and rigidity dependence of the primary cosmic-ray electron, positron, proton and helium fluxes over 79 Bartels rotations from May 2011 to May 2017 in the energy range from 1 to 50 GeV. For the first time, the charge-sign dependent modulation during solar maximum has been investigated in detail by leptons alone. We report the observation of short-term structures on the timescale of months coincident in all the fluxes. These structures are not visible in the positron-to-electron flux ratio. The precision measurements across the solar polarity reversal show that the ratio exhibits a smooth transition over ~800 days from one value to another.
Precision measurement of the cosmic-ray electron and positron fluxes as a function of time and energy with the Alpha Magnetic Spectrometer on the International Space Station
Spatially Resolved Plasma Diagnostics of the Supernova Remnant DEM L71 using the Reflection Grating Spectrometer
The Institute of Space and Astronautical Science, Japan Aerospace and Exploration Agency（宇宙科学研究所，日本宇宙航空研究开发机构）；RIKEN Pioneering Research Institute（理化学研究所先导研究机构）；Faculty of Engineering, University of Miyazaki（宫崎大学工学部）；Department of Physics, The University of Tokyo（东京大学物理学系）
Precision Measurement of Boron-to-Carbon ratio in Cosmic Rays from 2 GV to 2 TV with the Alpha Magnetic Spectrometer on the International Space Station
AMS-02是2011年5月安装在国际空间站上的一个被广泛接受的高能物理实验，自那时以来一直在持续运行。AMS-02能够分离污染小于$10^{-3}$的宇宙射线轻核（$1\leq Z \leq 8$）。宇宙射线硼和碳通量之间的比率已知对宇宙射线在银河系中的传播特性非常敏感，因为硼是在星际介质上的较重的主要元素如碳和氧的次级产物。达到TeV区域的精确测量可以极大地帮助理解宇宙射线在银河系中的传播以及到达地球之前穿过的物质数量。介绍了基于1000万次硼碳事件的硼碳比测量的现状。
