Time Variation of Cosmic Ray Elementary Particles

Hsin-Yi Chou^1*

¹Institute of Physics, Academia Sinica, Taipei, Taiwan

* Presenter:Hsin-Yi Chou, email:hsinyichou@gate.sinica.edu.tw

The Alpha Magnetic Spectrometer is a general-purpose particle detector onboard the International Space Station. AMS measures the charge, energy, and momentum of charged cosmic rays precisely from 1GV to a few TV in rigidity. AMS has been collected and analyzed more than 160 billion cosmic ray events since May 2011. In this talk, we report the time variation of the cosmic ray spectra ratios, included electron-to-positron and antiproton-to-proton. An unexpected feature of time lag in solar modulation of cosmic rays is observed, which requires a new explanation of the cosmic rays’ propagation mechanism in solar modulation.

Keywords: AMS, Cosmic Rays, Solar Modulation