Status of the operations of CALET for 7.5 years on the International Space Station

The CALorimetric Electron Telescope (CALET) has successfully been carrying out cosmic-ray observations on the International Space Station since October, 2015. CALET directly measures the cosmic-ray electron spectrum in the energy range of 1 GeV to 20 TeV with a 2 % energy resolution above 30 GeV. In addition, the instrument can measure the spectrum of gamma rays well into the TeV range, and the spectra of protons and nuclei up to a PeV. The scientific operations are implemented by taking into account orbital variations of geomagnetic rigidity cutoff. Scheduled command sequences are used to control the CALET observation modes on orbit. The high-energy (> 10 GeV) trigger mode is always active for maintaining maximum exposure to high-energy electrons and other high-energy shower events. Also, around the ISS orbit, calibration data acquisition by, for example, recording pedestal and penetrating particle events, a low-energy electron trigger mode operating at high geomagnetic latitude, a low-energy gamma-ray trigger mode operating at low geomagnetic latitude, and an ultra-heavy trigger mode, are scheduled. As of June 30, 2023, the total observation time is 2818 days with a live time fraction of the total time around 86 %. Nearly 1.86 billion events are collected with the high-energy trigger.

p: spectrum
satellite: orbit
electron: detector
electron: trigger
electron: spectrum
electron: cosmic radiation
cosmic radiation: VHE
CALET
GeV
gamma ray

References(19)

Figures(0)

[1]

Energy Spectrum of Cosmic-Ray Electron and Positron from 10 GeV to 3 TeV Observed with the Calorimetric Electron Telescope on the International Space Station

CALET

Collaboration

•

O. Adriani
(
- Florence U. and
- INFN, Florence
)

et al.

- Phys.Rev.Lett. 119 (2017) 18, 181101
•
e-Print:
- 1712.01711
•
DOI:
- 10.1103/PhysRevLett.119.181101

[2]

Extended Measurement of the Cosmic-Ray Electron and Positron Spectrum from 11 GeV to 4.8 TeV with the Calorimetric Electron Telescope on the International Space Station

O. Adriani
(
- Florence U. and
- INFN, Florence
)
,
Y. Akaike
(
)
,
K. Asano
(
- Tokyo U., ICRR
)
,
Y. Asaoka
(
- Waseda U., RISE and
- AIST, Tsukuba
)
,
M.G. Bagliesi
(
- U. Siena, DSFTA and
- INFN, Pisa
)

et al.

- Phys.Rev.Lett. 120 (2018) 26, 261102
•
e-Print:
- 1806.09728
•
DOI:
- 10.1103/PhysRevLett.120.261102

[3]

Direct Measurement of the Cosmic-Ray Proton Spectrum from 50 GeV to 10 TeV with the Calorimetric Electron Telescope on the International Space Station

CALET

Collaboration

•

O. Adriani
(
- Florence U. and
- INFN, Florence
)

et al.

- Phys.Rev.Lett. 122 (2019) 18, 181102
•
e-Print:
- 1905.04229
•
DOI:
- 10.1103/PhysRevLett.122.181102

[4]

Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station

CALET

Collaboration

•

O. Adriani
(
- INFN, Florence and
- Florence U.
)

et al.

- Phys.Rev.Lett. 129 (2022) 10, 101102
•
e-Print:
- 2209.01302
•
DOI:
- 10.1103/PhysRevLett.129.101102

[5]

Direct Measurement of the Cosmic-Ray Helium Spectrum from 40 GeV to 250 TeV with the Calorimetric Electron Telescope on the International Space Station

CALET

Collaboration

•

O. Adriani
(
- INFN, Florence
)

et al.

- Phys.Rev.Lett. 130 (2023) 17, 171002
•
e-Print:
- 2304.14699
•
DOI:
- 10.1103/PhysRevLett.130.171002

[6]

Cosmic-Ray Boron Flux Measured from $8.4 GeV / n$ to $3.8 TeV / n$ with the Calorimetric Electron Telescope on the International Space Station

CALET

Collaboration

•

O. Adriani
(
- Florence U.
)

et al.

- Phys.Rev.Lett. 129 (2022) 25, 251103
•
e-Print:
- 2212.07873
•
DOI:
- 10.1103/PhysRevLett.129.251103

[7]

Measurement of cosmic-ray carbon and oxygen energy spectra with CALET

CALET

Collaboration

•

Paolo Maestro

for the collaboration.

- Adv.Space Res. 64 (2019) 2538-2545
•
DOI:
- 10.1016/j.asr.2019.04.015

[8]

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

et al.

- Phys.Rev.Lett. 125 251102
•
e-Print:
- 2012.10319
•
DOI:
- 10.1103/PhysRevLett.125.251102

[9]

Measurement of the Iron Spectrum in Cosmic Rays from 10 GeV/ $n$ to 2.0 TeV/ $n$ with the Calorimetric Electron Telescope on the International Space Station

CALET

Collaboration

•

O. Adriani
(
- Florence U. and
- INFN, Florence
)

et al.

- Phys.Rev.Lett. 126 (2021) 24, 241101
•
e-Print:
- 2106.08036
•
DOI:
- 10.1103/PhysRevLett.126.241101

[10]

Direct Measurement of the Nickel Spectrum in Cosmic Rays in the Energy Range from 8.8 GeV/n to 240 GeV/n with CALET on the International Space Station

CALET

Collaboration

•

O. Adriani
(
- INFN, Florence
)

et al.

- Phys.Rev.Lett. 128 (2022) 13, 131103
•
e-Print:
- 2204.00845
•
DOI:
- 10.1103/PhysRevLett.128.131103

[11]

Relativistic electron precipitation at International Space Station: Space weather monitoring by Calorimetric Electron Telescope

R.Kataoka
,
Y.Asaoka
,
S.Torii
,
T.Terasawa
,
S.Ozawa

et al.

•
DOI:
- 10.1002/2016GL068930

[12]

Plasma Waves Causing Relativistic Electron Precipitation Events at International Space Station: Lessons From Conjunction Observations With Arase Satellite

R.Kataoka
,
Y.Asaoka
,
S.Torii
,
S.Nakahira
,
H.Ueno

et al.

- J.Geophys.Res.Space Phys. 125 (2020) e2020

[13]

EMIC-Wave Driven Electron Precipitation Observed by CALET on the International Space Station

Bruno
,
L.W. Blum
,
G.A. de Nolfo
,
R. Kataoka
,
S. Torii

et al.

[14]

Charge-Sign Dependent Cosmic-Ray Modulation Observed with the Calorimetric Electron Telescope on the International Space Station

CALET

Collaboration

•

O. Adriani
(
- INFN, Florence
)

et al.

- Phys.Rev.Lett. 130 (2023) 21, 211001,
- Phys.Rev.Lett. 131 (2023) 10, 109902 (erratum)
•
e-Print:
- 2305.16655
•
DOI:
- 10.1103/PhysRevLett.130.211001