Title

On-orbit Operations and Offline Data Processing of CALET Onboard the ISS

Authors

Y. Asaoka, Waseda Research Institute for Science and Engineering, Waseda University, JEM Utilization Center, Human Spaceflight Technology Directorate, Japan Aerospace Exploration Agency
S. Ozawa, Waseda Research Institute for Science and Engineering, Waseda University
S. Torii, Waseda Research Institute for Science and Engineering, Waseda University, JEM Utilization Center, Human Spaceflight Technology Directorate, Japan Aerospace Exploration Agency, Waseda University
O. Adriani, University of Florence, Via Sansone, INFN Sezione di Florence, Via Sansone
Y. Akaike, University of Maryland
K. Asano, Institute for Cosmic Ray Research, The University of Tokyo
M. G. Bagliesi, University of Siena, via Roma, INFN Sezione di Pisa
G. Bigongiari, University of Siena, via Roma, INFN Sezione di Pisa
W. R. Binns, Washington University
S. Bonechi, University of Siena, via Roma, INFN Sezione di Pisa
M. Bongi, University of Florence, Via Sansone, INFN Sezione di Florence
P. Brogi, University of Siena, via Roma, INFN Sezione di Pisa
J. H. Buckley, Washington University
N. Cannady, Louisiana State University
G. Castellini, Institute of Applied Physics (IFAC), National Research Council (CNR), Via Madonna del Piano
C. Checchia, University of Padova, INFN Sezione di Padova
M. L. Cherry, Louisiana State University
G. Collazuol, University of Padova, INFN Sezione di Padova
V. Di Felice, University of Rome “Tor Vergata”, Via della Ricerca Scientifica, INFN Sezione di Rome “Tor Vergata”, Via della Ricerca Scientifica
K. Ebisawa, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
H. Fuke, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
T.G. Guzik, Louisiana State University
T. Hams, University of Maryland, CRESST and Astroparticle Physics Laboratory NASA/GSFC
M. Hareyama, St. Marianna University School of Medicine
N. Hasebe, Research Institute for Science and Engineering, Waseda University
K. Hibino, Kanagawa University
M. Ichimura, Hirosaki University
K. Ioka, Yukawa Institute for Theoretical Physics, Kyoto University
W. Ishizaki, Institute for Cosmic Ray Research, The University of Tokyo
M. H. Israel, Washington University
A. Javaid, Louisiana State University
K. Kasahara, Research Institute for Science and Engineering, Waseda University
J. Kataoka, Research Institute for Science and Engineering, Waseda University
R. Kataoka, National Institute of Polar Research
Y. Katayose, Yokohama National University
C. Kato, Shinshu University
N. Kawanaka, Hakubi Center, Kyoto University
Y. Kawakubo, Aoyama Gakuin University
H. S. Krawczynski, Washington University
J. F. Krizmanic, CRESST and Astroparticle Physics Laboratory NASA/GSFC, University of Maryland
S. Kuramata, Hirosaki University
T. Lomtadze, University of Pisa, University of Maryland
P. Maestro, University of Siena, via Roma, INFN Sezione di Pisa
P. S. Marrocchesi, University of Siena, via Roma, INFN Sezione di Pisa
A. M. Messineo, University of Pisa, INFN Sezione di Pisa
J. W. Mitchell, Astroparticle Physics Laboratory, NASA/GSFC
S. Miyake, National Institute of Technology, Ibaraki College
K. Mizutani, Saitama University
A. A. Moiseev, University of Maryland, CRESST and Astroparticle Physics Laboratory NASA/GSFC
K. Mori, Research Institute for Science and Engineering, Waseda University, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
M. Mori, Louisiana State University
N. Mori, INFN Sezione di Florence, Via Sansone
H. M. Motz, International Center for Science and Engineering Programs, Waseda University
K. Munakata, Shinshu University
H. Murakami, Research Institute for Science and Engineering, Waseda University
S. Nakahira, RIKEN
J. Nishimura, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
G. A. de Nolfo, Heliospheric Physics Laboratory, NASA/GSFC
S. Okuno, Kanagawa University
J. F. Ormes, University of DenverFollow
L. Pacini, University of Florence, Institute of Applied Physics (IFAC), National Research Council (CNR), INFN Sezione di Florence
F. Palma, University of Rome “Tor Vergata”, Via della Ricerca Scientifica, INFN Sezione di Rome “Tor Vergata”, Via della Ricerca Scientifica
P. Papini, INFN Sezione di Florence, Via Sansone
A. V. Penacchioni, University of Siena, ASI Science Data Center (ASDC), Via del Politecnico snc
B. F. Rauch, Washington University
S. B. Ricciarini, Institute of Applied Physics (IFAC), National Research Council (CNR), Via Madonna del Piano, INFN Sezione di Florence
K. Sakai, CRESST and Astroparticle Physics Laboratory NASA/GSFC, University of Maryland
T. Sakamoto, Aoyama Gakuin University
M. Sasaki, CRESST and Astroparticle Physics Laboratory NASA/GSFC, University of Maryland
Y. Shimizu, Kanagawa University
A. Shiomi, Nihon University
R. Sparvoli, University of Rome “Tor Vergata”, Via della Ricerca Scientifica, INFN Sezione di Rome “Tor Vergata”, Via della Ricerca Scientifica
P. Spillantini, University of Florence
F. Stolzi, University of Siena, via Roma, INFN Sezione di Pisa
I. Takahashi, Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo
M. Takayanagi, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
M. Takita, Institute for Cosmic Ray Research, The University of Tokyo
T. Tamura, Kanagawa University
N. Tateyama, Kanagawa University
T. Terasawa, RIKEN
H. Tomida, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
Y. Tsunesada, Osaka City University
Y. Uchihori, National Institutes for Quantum and Radiation Science and Technology
S. Ueno, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
E. Vannuccini, INFN Sezione di Florence, Via Sansone
J. P. Wefel, Louisiana State University
K. Yamaoka, Nagoya University
S. Yanagita, Ibaraki University
A. Yoshida, Aoyama Gakuin University
K. Yoshida, Shibaura Institute of Technology
T. Yuda, Institute for Cosmic Ray Research, The University of Tokyo

Publication Date

7-2018

Document Type

Article

Organizational Units

Physics and Astronomy

Keywords

CALET, Cosmic-ray electrons, Calorimeter, International space station, Direct measurement

Abstract

The CALorimetric Electron Telescope (CALET), launched for installation on the International Space Station (ISS) in August, 2015, has been accumulating scientific data since October, 2015. CALET is intended to perform long-duration observations of high-energy cosmic rays onboard the ISS. 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.

In order to operate the CALET onboard ISS, JAXA Ground Support Equipment (JAXA-GSE) and the Waseda CALET Operations Center (WCOC) have been established at JAXA and Waseda University, respectively. Scientific operations using CALET are planned at WCOC, taking into account orbital variations of geomagnetic rigidity cutoff. Scheduled command sequences are used to control the CALET observation modes on 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 around the ISS orbit while maintaining maximum exposure to high-energy electrons and other high-energy shower events by always having the high-energy trigger mode active. The WCOC also prepares and distributes CALET flight data to collaborators in Italy and the United States.

As of August 31, 2017, the total observation time is 689 days with a live time fraction of the total time of  ∼ 84%. Nearly 450 million events are collected with a high-energy (E > 10 GeV) trigger. In addition, calibration data acquisition and low-energy trigger modes, as well as an ultra-heavy trigger mode, are consistently scheduled around the ISS orbit. By combining all operation modes with the excellent-quality on-orbit data collected thus far, it is expected that a five-year observation period will provide a wealth of new and interesting results.

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