1. CALET Observations during the First 5 Years on the ISS.
- Author
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Marrocchesi, P. S., Adriani, O., Akaike, Y., Asaoka, Y., Berti, E., Bigongiari, G., Bongi, M., Brogi, P., Bruno, A., Cannady, N., Checchia, C., Cherry, M. L., Collazuol, G., Ficklin, A. W., Guzik, T. G., Ichimura, M., Israel, M. H., Kasahara, K., Kawakubo, Y., and Krizmanic, J. F.
- Subjects
HEAVY nuclei ,TRANSIENTS (Dynamics) ,GAMMA rays ,COSMIC rays ,SPACE stations ,POSITRONS ,GRAVITATIONAL waves ,IRON powder - Abstract
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 electron/proton discrimination. Two independent sub-systems identify the charge of the incident particle from proton to iron and above ( 40). CALET measures the cosmic-ray electron + positron flux up to 20 TeV, gamma rays up to 10 TeV, and nuclei up to the PeV scale. 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. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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