CALET data of the cosmic-ray carbon and oxygen spectra is open to public: spectral hardening is observed
CALET, launched to the International Space Station in August 2015, is a calorimeter to measure cosmic rays and has been accumulating scientific data for over five years.
CALET measured the spectra of the cosmic-ray carbon and oxygen from 10 GeV/n to 2.2 TeV/n, and the spectra indicate the hardening around 200 GeV/n.
The tables of the spectra measured by CALET are open to public via DARTS on March 2, 2021.
The spectral hardening was also reported in the proton spectrum as well as in heavy nuclei spectra,
compelled a revision of the standard paradigm of galactic cosmic-rays based on the acceleration in the supernovae remnant and propagation in the galactic magnetic fields,
and prompted an intense theoretical activity to interpret these unexpected spectral features.
This result was published from Physical Review Letter on December 18, 2020.
- Introduction of CALET(Japanese)
- CALET project Web site(Japanese)
- CALET succeeds in direct measurements of cosmic-ray electron spectrum up to 4.8 TeV
- Direct Measurement of the Cosmic-Ray Proton Spectrum from 50 GeV to 10 TeV with the Calorimetric Electron Telescope on the International Space Station
- Direct Measurement of the Cosmic-Ray Carbon and Oxygen Spectra from 10 GeV/n to 2.2 TeV/n with the Calorimetric Electron Telescope on the International Space Station