Jul 5 – 10, 2021
Europe/Rome timezone

CALET on the ISS: the first 5 years

Jul 6, 2021, 9:55 AM
Invited talk in the parallel session Observations of HE and UHE Cosmic Rays Observations of HE and UHE Cosmic Rays


Prof. Pier Simone Marrocchesi (University of Siena and INFN Pisa)


The CALorimetric Electron Telescope CALET is collecting science data on the International Space Station since October 2015 with excellent and continuous performance. Energy is measured with a deep homogeneous calorimeter (1.2 nuclear interaction lengths, 27 radiation lengths) preceded by an imaging pre- shower (3 radiation lengths, 1mm granularity) providing tracking and 10$^{-5}$ electron/proton discrimination. Two independent sub-systems identify the charge Z of the incident particle from proton to iron and above (Z<40). CALET measures the cosmic-ray electron+positron flux up to 20 TeV, gamma rays up to 10 TeV, and nuclei up to 1 PeV.
In this paper, we report the on-orbit performance of the instrument and summarize the main results obtained during the first 5 years of operation, including the electron+positron energy spectrum and the individual spectra of protons, heavier nuclei and iron. Solar modulation and gamma- ray observations are also concisely reported, as well as transient phenomena and the search for gravitational wave counterparts.

Primary authors

Prof. Pier Simone Marrocchesi (University of Siena and INFN Pisa) for the CALET Collaboration

Presentation materials