The energy spectrum of ultra-high-energy cosmic rays measured by the Telescope Array FADC fluorescence detectors in monocular mode

T. Abu-Zayyad; R. Aida; M. Allen; R. Anderson; R. Azuma; E. Barcikowski; J. W. Belz; D. R. Bergman; S. A. Blake; R. Cady; B. G. Cheon; J. Chiba; M. Chikawa; E. J. Cho; W. R. Cho; H. Fujii; T. Fujii; T. Fukuda; M. Fukushima; W. Hanlon; K. Hayashi; Y. Hayashi; N. Hayashida; K. Hibino; K. Hiyama; K. Honda; T. Iguchi; D. Ikeda; K. Ikuta; N. Inoue; T. Ishii; R. Ishimori; H. Ito; D. Ivanov; S. Iwamoto; C. C.H. Jui; K. Kadota; F. Kakimoto; O. Kalashev; T. Kanbe; K. Kasahara; H. Kawai; S. Kawakami; S. Kawana; E. Kido; H. B. Kim; H. K. Kim; J. H. Kim; J. H. Kim; K. Kitamoto; S. Kitamura; Y. Kitamura; K. Kobayashi; Y. Kobayashi; Y. Kondo; K. Kuramoto; V. Kuzmin; Y. J. Kwon; J. Lan; S. I. Lim; J. P. Lundquist; S. Machida; K. Martens; T. Matsuda; T. Matsuura; T. Matsuyama; J. N. Matthews; I. Myers; M. Minamino; K. Miyata; Y. Murano; S. Nagataki; T. Nakamura; S. W. Nam; T. Nonaka; S. Ogio; J. Ogura; M. Ohnishi; H. Ohoka; K. Oki; D. Oku; T. Okuda; M. Ono; A. Oshima; S. Ozawa; I. H. Park; M. S. Pshirkov; D. C. Rodriguez; S. Y. Roh; G. Rubtsov; D. Ryu; H. Sagawa; N. Sakurai; A. L. Sampson; L. M. Scott; P. D. Shah; F. Shibata; T. Shibata; H. Shimodaira; B. K. Shin; J. I. Shin; T. Shirahama; J. D. Smith; P. Sokolsky; T. J. Sonley; R. W. Springer; B. T. Stokes; S. R. Stratton; T. A. Stroman; S. Suzuki; Y. Takahashi; M. Takeda; A. Taketa; M. Takita; Y. Tameda; H. Tanaka; K. Tanaka; M. Tanaka; S. B. Thomas; G. B. Thomson; P. Tinyakov; I. Tkachev; H. Tokuno; T. Tomida; S. Troitsky; Y. Tsunesada; K. Tsutsumi; Y. Tsuyuguchi; Y. Uchihori; S. Udo; H. Ukai; G. Vasiloff; Y. Wada; T. Wong; Y. Yamakawa; R. Yamane; H. Yamaoka; K. Yamazaki; J. Yang; Y. Yoneda; S. Yoshida; H. Yoshii; R. Zollinger; Z. Zundel

doi:10.1016/j.astropartphys.2013.06.007

The energy spectrum of ultra-high-energy cosmic rays measured by the Telescope Array FADC fluorescence detectors in monocular mode

T. Abu-Zayyad, R. Aida, M. Allen, R. Anderson, R. Azuma, E. Barcikowski, J. W. Belz, D. R. Bergman, S. A. Blake, R. Cady, B. G. Cheon, J. Chiba, M. Chikawa, E. J. Cho, W. R. Cho, H. Fujii, T. Fujii, T. Fukuda, M. Fukushima, W. HanlonK. Hayashi, Y. Hayashi, N. Hayashida, K. Hibino, K. Hiyama, K. Honda, T. Iguchi, D. Ikeda, K. Ikuta, N. Inoue, T. Ishii, R. Ishimori, H. Ito, D. Ivanov, S. Iwamoto, C. C.H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, T. Kanbe, K. Kasahara, H. Kawai, S. Kawakami, S. Kawana, E. Kido, H. B. Kim, H. K. Kim, J. H. Kim, J. H. Kim, K. Kitamoto, S. Kitamura, Y. Kitamura, K. Kobayashi, Y. Kobayashi, Y. Kondo, K. Kuramoto, V. Kuzmin, Y. J. Kwon, J. Lan, S. I. Lim, J. P. Lundquist, S. Machida, K. Martens, T. Matsuda, T. Matsuura, T. Matsuyama, J. N. Matthews, I. Myers, M. Minamino, K. Miyata, Y. Murano, S. Nagataki, T. Nakamura, S. W. Nam, T. Nonaka, S. Ogio, J. Ogura, M. Ohnishi, H. Ohoka, K. Oki, D. Oku, T. Okuda, M. Ono, A. Oshima, S. Ozawa, I. H. Park, M. S. Pshirkov, D. C. Rodriguez, S. Y. Roh, G. Rubtsov, D. Ryu, H. Sagawa, N. Sakurai, A. L. Sampson, L. M. Scott, P. D. Shah, F. Shibata, T. Shibata, H. Shimodaira, B. K. Shin, J. I. Shin, T. Shirahama, J. D. Smith, P. Sokolsky, T. J. Sonley, R. W. Springer, B. T. Stokes, S. R. Stratton, T. A. Stroman, S. Suzuki, Y. Takahashi, M. Takeda, A. Taketa, M. Takita, Y. Tameda, H. Tanaka, K. Tanaka, M. Tanaka, S. B. Thomas, G. B. Thomson, P. Tinyakov, I. Tkachev, H. Tokuno, T. Tomida, S. Troitsky, Y. Tsunesada, K. Tsutsumi, Y. Tsuyuguchi, Y. Uchihori, S. Udo, H. Ukai, G. Vasiloff, Y. Wada, T. Wong, Y. Yamakawa, R. Yamane, H. Yamaoka, K. Yamazaki, J. Yang, Y. Yoneda, S. Yoshida, H. Yoshii, R. Zollinger, Z. Zundel

Experimental Particle Physics

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28 Citations (Scopus)

Abstract

We present a measurement of the energy spectrum of ultra-high-energy cosmic rays performed by the Telescope Array experiment using monocular observations from its two new FADC-based fluorescence detectors. After a short description of the experiment, we describe the data analysis and event reconstruction procedures. Since the aperture of the experiment must be calculated by Monte Carlo simulation, we describe this calculation and the comparisons of simulated and real data used to verify the validity of the aperture calculation. Finally, we present the energy spectrum calculated from the merged monocular data sets of the two FADC-based detectors, and also the combination of this merged spectrum with an independent, previously published monocular spectrum measurement performed by Telescope Array's third fluorescence detector [T. Abu-Zayyad et al., The energy spectrum of Telescope Array's middle drum detector and the direct comparison to the high resolution fly's eye experiment, Astroparticle Physics 39 (2012) 109-119, http://dx.doi.org/10.1016/j.astropartphys.2012.05. 012, Available from: <arXiv:1202.5141>]. This combined spectrum corroborates the recently published Telescope Array surface detector spectrum [T. Abu-Zayyad, et al., The cosmic-ray energy spectrum observed with the surface detector of the Telescope Array experiment, ApJ 768 (2013) L1, http://dx.doi.org/10.1088/2041-8205/768/1/L1, Available from: <arXiv:1205.5067>] with independent systematic uncertainties.

Original language	English
Pages (from-to)	16-24
Number of pages	9
Journal	Astroparticle Physics
Volume	48
DOIs	https://doi.org/10.1016/j.astropartphys.2013.06.007
Publication status	Published - 2013

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics

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10.1016/j.astropartphys.2013.06.007

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Abu-Zayyad, T., Aida, R., Allen, M., Anderson, R., Azuma, R., Barcikowski, E., Belz, J. W., Bergman, D. R., Blake, S. A., Cady, R., Cheon, B. G., Chiba, J., Chikawa, M., Cho, E. J., Cho, W. R., Fujii, H., Fujii, T., Fukuda, T., Fukushima, M., ... Zundel, Z. (2013). The energy spectrum of ultra-high-energy cosmic rays measured by the Telescope Array FADC fluorescence detectors in monocular mode. Astroparticle Physics, 48, 16-24. https://doi.org/10.1016/j.astropartphys.2013.06.007

Abu-Zayyad, T, Aida, R, Allen, M, Anderson, R, Azuma, R, Barcikowski, E, Belz, JW, Bergman, DR, Blake, SA, Cady, R, Cheon, BG, Chiba, J, Chikawa, M, Cho, EJ, Cho, WR, Fujii, H, Fujii, T, Fukuda, T, Fukushima, M, Hanlon, W, Hayashi, K, Hayashi, Y, Hayashida, N, Hibino, K, Hiyama, K, Honda, K, Iguchi, T, Ikeda, D, Ikuta, K, Inoue, N, Ishii, T, Ishimori, R, Ito, H, Ivanov, D, Iwamoto, S, Jui, CCH, Kadota, K, Kakimoto, F, Kalashev, O, Kanbe, T, Kasahara, K, Kawai, H, Kawakami, S, Kawana, S, Kido, E, Kim, HB, Kim, HK, Kim, JH, Kim, JH, Kitamoto, K, Kitamura, S, Kitamura, Y, Kobayashi, K, Kobayashi, Y, Kondo, Y, Kuramoto, K, Kuzmin, V, Kwon, YJ, Lan, J, Lim, SI, Lundquist, JP, Machida, S, Martens, K, Matsuda, T, Matsuura, T, Matsuyama, T, Matthews, JN, Myers, I, Minamino, M, Miyata, K, Murano, Y, Nagataki, S, Nakamura, T, Nam, SW, Nonaka, T, Ogio, S, Ogura, J, Ohnishi, M, Ohoka, H, Oki, K, Oku, D, Okuda, T, Ono, M, Oshima, A, Ozawa, S, Park, IH, Pshirkov, MS, Rodriguez, DC, Roh, SY, Rubtsov, G, Ryu, D, Sagawa, H, Sakurai, N, Sampson, AL, Scott, LM, Shah, PD, Shibata, F, Shibata, T, Shimodaira, H, Shin, BK, Shin, JI, Shirahama, T, Smith, JD, Sokolsky, P, Sonley, TJ, Springer, RW, Stokes, BT, Stratton, SR, Stroman, TA, Suzuki, S, Takahashi, Y, Takeda, M, Taketa, A, Takita, M, Tameda, Y, Tanaka, H, Tanaka, K, Tanaka, M, Thomas, SB, Thomson, GB, Tinyakov, P, Tkachev, I, Tokuno, H, Tomida, T, Troitsky, S, Tsunesada, Y, Tsutsumi, K, Tsuyuguchi, Y, Uchihori, Y, Udo, S, Ukai, H, Vasiloff, G, Wada, Y, Wong, T, Yamakawa, Y, Yamane, R, Yamaoka, H, Yamazaki, K, Yang, J, Yoneda, Y, Yoshida, S, Yoshii, H, Zollinger, R & Zundel, Z 2013, 'The energy spectrum of ultra-high-energy cosmic rays measured by the Telescope Array FADC fluorescence detectors in monocular mode', Astroparticle Physics, vol. 48, pp. 16-24. https://doi.org/10.1016/j.astropartphys.2013.06.007

@article{1108b48824d349378e77a97222f67b1e,

title = "The energy spectrum of ultra-high-energy cosmic rays measured by the Telescope Array FADC fluorescence detectors in monocular mode",

abstract = "We present a measurement of the energy spectrum of ultra-high-energy cosmic rays performed by the Telescope Array experiment using monocular observations from its two new FADC-based fluorescence detectors. After a short description of the experiment, we describe the data analysis and event reconstruction procedures. Since the aperture of the experiment must be calculated by Monte Carlo simulation, we describe this calculation and the comparisons of simulated and real data used to verify the validity of the aperture calculation. Finally, we present the energy spectrum calculated from the merged monocular data sets of the two FADC-based detectors, and also the combination of this merged spectrum with an independent, previously published monocular spectrum measurement performed by Telescope Array's third fluorescence detector [T. Abu-Zayyad et al., The energy spectrum of Telescope Array's middle drum detector and the direct comparison to the high resolution fly's eye experiment, Astroparticle Physics 39 (2012) 109-119, http://dx.doi.org/10.1016/j.astropartphys.2012.05. 012, Available from: ]. This combined spectrum corroborates the recently published Telescope Array surface detector spectrum [T. Abu-Zayyad, et al., The cosmic-ray energy spectrum observed with the surface detector of the Telescope Array experiment, ApJ 768 (2013) L1, http://dx.doi.org/10.1088/2041-8205/768/1/L1, Available from: ] with independent systematic uncertainties.",

author = "T. Abu-Zayyad and R. Aida and M. Allen and R. Anderson and R. Azuma and E. Barcikowski and Belz, {J. W.} and Bergman, {D. R.} and Blake, {S. A.} and R. Cady and Cheon, {B. G.} and J. Chiba and M. Chikawa and Cho, {E. J.} and Cho, {W. R.} and H. Fujii and T. Fujii and T. Fukuda and M. Fukushima and W. Hanlon and K. Hayashi and Y. Hayashi and N. Hayashida and K. Hibino and K. Hiyama and K. Honda and T. Iguchi and D. Ikeda and K. Ikuta and N. Inoue and T. Ishii and R. Ishimori and H. Ito and D. Ivanov and S. Iwamoto and Jui, {C. C.H.} and K. Kadota and F. Kakimoto and O. Kalashev and T. Kanbe and K. Kasahara and H. Kawai and S. Kawakami and S. Kawana and E. Kido and Kim, {H. B.} and Kim, {H. K.} and Kim, {J. H.} and Kim, {J. H.} and K. Kitamoto and S. Kitamura and Y. Kitamura and K. Kobayashi and Y. Kobayashi and Y. Kondo and K. Kuramoto and V. Kuzmin and Kwon, {Y. J.} and J. Lan and Lim, {S. I.} and Lundquist, {J. P.} and S. Machida and K. Martens and T. Matsuda and T. Matsuura and T. Matsuyama and Matthews, {J. N.} and I. Myers and M. Minamino and K. Miyata and Y. Murano and S. Nagataki and T. Nakamura and Nam, {S. W.} and T. Nonaka and S. Ogio and J. Ogura and M. Ohnishi and H. Ohoka and K. Oki and D. Oku and T. Okuda and M. Ono and A. Oshima and S. Ozawa and Park, {I. H.} and Pshirkov, {M. S.} and Rodriguez, {D. C.} and Roh, {S. Y.} and G. Rubtsov and D. Ryu and H. Sagawa and N. Sakurai and Sampson, {A. L.} and Scott, {L. M.} and Shah, {P. D.} and F. Shibata and T. Shibata and H. Shimodaira and Shin, {B. K.} and Shin, {J. I.} and T. Shirahama and Smith, {J. D.} and P. Sokolsky and Sonley, {T. J.} and Springer, {R. W.} and Stokes, {B. T.} and Stratton, {S. R.} and Stroman, {T. A.} and S. Suzuki and Y. Takahashi and M. Takeda and A. Taketa and M. Takita and Y. Tameda and H. Tanaka and K. Tanaka and M. Tanaka and Thomas, {S. B.} and Thomson, {G. B.} and P. Tinyakov and I. Tkachev and H. Tokuno and T. Tomida and S. Troitsky and Y. Tsunesada and K. Tsutsumi and Y. Tsuyuguchi and Y. Uchihori and S. Udo and H. Ukai and G. Vasiloff and Y. Wada and T. Wong and Y. Yamakawa and R. Yamane and H. Yamaoka and K. Yamazaki and J. Yang and Y. Yoneda and S. Yoshida and H. Yoshii and R. Zollinger and Z. Zundel",

note = "Funding Information: The Telescope Array experiment is supported by the Japan Society for the Promotion of Science through Grants-in-Aid for Scientific Research on Specially Promoted Research ( 21000002 ) “Extreme Phenomena in the Universe Explored by Highest Energy Cosmic Rays,” and the Inter-University Research Program of the Institute for Cosmic Ray Research; by the US National Science Foundation awards PHY-0307098 , PHY-0601915 , PHY-0703893 , PHY-0758342 , PHY-0848320 , PHY-1069280 , and PHY-1069286 (Utah) and PHY-0649681 (Rutgers) , and through TeraGrid resources provided by Purdue University and Indiana University [30] ; by the National Research Foundation of Korea ( 2006-0050031 , 2007-0056005 , 2007-0093860 , 2010-0011378 , 2010-0028071 , R32-10130 ); by the Russian Academy of Sciences, RFBR Grants 10-02-01406a and 11-02-01528a (INR) , IISN project No. 4.4509.10 , and Belgian Science Policy under IUAP VI/11 (ULB). The foundations of Dr. Ezekiel R. and Edna Wattis Dumke, Willard L. Eccles, and George S. and Dolores Dor{\'e} Eccles all helped with generous donations. The State of Utah supported the project through its Economic Development Board, and the University of Utah through the Office of the Vice President for Research. The experimental site became available through the cooperation of the Utah School and Institutional Trust Lands Administration (SITLA), the US Bureau of Land Management, and the US Air Force. We also wish to thank the people and the officials of Millard County, Utah, for their steadfast and warm support. We gratefully acknowledge the contributions from the technical staffs of our home institutions as well as the University of Utah Center for High Performance Computing (CHPC).",

year = "2013",

doi = "10.1016/j.astropartphys.2013.06.007",

language = "English",

volume = "48",

pages = "16--24",

journal = "Astroparticle Physics",

issn = "0927-6505",

publisher = "Elsevier",

}

TY - JOUR

T1 - The energy spectrum of ultra-high-energy cosmic rays measured by the Telescope Array FADC fluorescence detectors in monocular mode

AU - Abu-Zayyad, T.

AU - Aida, R.

AU - Allen, M.

AU - Anderson, R.

AU - Azuma, R.

AU - Barcikowski, E.

AU - Belz, J. W.

AU - Bergman, D. R.

AU - Blake, S. A.

AU - Cady, R.

AU - Cheon, B. G.

AU - Chiba, J.

AU - Chikawa, M.

AU - Cho, E. J.

AU - Cho, W. R.

AU - Fujii, H.

AU - Fujii, T.

AU - Fukuda, T.

AU - Fukushima, M.

AU - Hanlon, W.

AU - Hayashi, K.

AU - Hayashi, Y.

AU - Hayashida, N.

AU - Hibino, K.

AU - Hiyama, K.

AU - Honda, K.

AU - Iguchi, T.

AU - Ikeda, D.

AU - Ikuta, K.

AU - Inoue, N.

AU - Ishii, T.

AU - Ishimori, R.

AU - Ito, H.

AU - Ivanov, D.

AU - Iwamoto, S.

AU - Jui, C. C.H.

AU - Kadota, K.

AU - Kakimoto, F.

AU - Kalashev, O.

AU - Kanbe, T.

AU - Kasahara, K.

AU - Kawai, H.

AU - Kawakami, S.

AU - Kawana, S.

AU - Kido, E.

AU - Kim, H. B.

AU - Kim, H. K.

AU - Kim, J. H.

AU - Kitamoto, K.

AU - Kitamura, S.

AU - Kitamura, Y.

AU - Kobayashi, K.

AU - Kobayashi, Y.

AU - Kondo, Y.

AU - Kuramoto, K.

AU - Kuzmin, V.

AU - Kwon, Y. J.

AU - Lan, J.

AU - Lim, S. I.

AU - Lundquist, J. P.

AU - Machida, S.

AU - Martens, K.

AU - Matsuda, T.

AU - Matsuura, T.

AU - Matsuyama, T.

AU - Matthews, J. N.

AU - Myers, I.

AU - Minamino, M.

AU - Miyata, K.

AU - Murano, Y.

AU - Nagataki, S.

AU - Nakamura, T.

AU - Nam, S. W.

AU - Nonaka, T.

AU - Ogio, S.

AU - Ogura, J.

AU - Ohnishi, M.

AU - Ohoka, H.

AU - Oki, K.

AU - Oku, D.

AU - Okuda, T.

AU - Ono, M.

AU - Oshima, A.

AU - Ozawa, S.

AU - Park, I. H.

AU - Pshirkov, M. S.

AU - Rodriguez, D. C.

AU - Roh, S. Y.

AU - Rubtsov, G.

AU - Ryu, D.

AU - Sagawa, H.

AU - Sakurai, N.

AU - Sampson, A. L.

AU - Scott, L. M.

AU - Shah, P. D.

AU - Shibata, F.

AU - Shibata, T.

AU - Shimodaira, H.

AU - Shin, B. K.

AU - Shin, J. I.

AU - Shirahama, T.

AU - Smith, J. D.

AU - Sokolsky, P.

AU - Sonley, T. J.

AU - Springer, R. W.

AU - Stokes, B. T.

AU - Stratton, S. R.

AU - Stroman, T. A.

AU - Suzuki, S.

AU - Takahashi, Y.

AU - Takeda, M.

AU - Taketa, A.

AU - Takita, M.

AU - Tameda, Y.

AU - Tanaka, H.

AU - Tanaka, K.

AU - Tanaka, M.

AU - Thomas, S. B.

AU - Thomson, G. B.

AU - Tinyakov, P.

AU - Tkachev, I.

AU - Tokuno, H.

AU - Tomida, T.

AU - Troitsky, S.

AU - Tsunesada, Y.

AU - Tsutsumi, K.

AU - Tsuyuguchi, Y.

AU - Uchihori, Y.

AU - Udo, S.

AU - Ukai, H.

AU - Vasiloff, G.

AU - Wada, Y.

AU - Wong, T.

AU - Yamakawa, Y.

AU - Yamane, R.

AU - Yamaoka, H.

AU - Yamazaki, K.

AU - Yang, J.

AU - Yoneda, Y.

AU - Yoshida, S.

AU - Yoshii, H.

AU - Zollinger, R.

AU - Zundel, Z.

N1 - Funding Information: The Telescope Array experiment is supported by the Japan Society for the Promotion of Science through Grants-in-Aid for Scientific Research on Specially Promoted Research ( 21000002 ) “Extreme Phenomena in the Universe Explored by Highest Energy Cosmic Rays,” and the Inter-University Research Program of the Institute for Cosmic Ray Research; by the US National Science Foundation awards PHY-0307098 , PHY-0601915 , PHY-0703893 , PHY-0758342 , PHY-0848320 , PHY-1069280 , and PHY-1069286 (Utah) and PHY-0649681 (Rutgers) , and through TeraGrid resources provided by Purdue University and Indiana University [30] ; by the National Research Foundation of Korea ( 2006-0050031 , 2007-0056005 , 2007-0093860 , 2010-0011378 , 2010-0028071 , R32-10130 ); by the Russian Academy of Sciences, RFBR Grants 10-02-01406a and 11-02-01528a (INR) , IISN project No. 4.4509.10 , and Belgian Science Policy under IUAP VI/11 (ULB). The foundations of Dr. Ezekiel R. and Edna Wattis Dumke, Willard L. Eccles, and George S. and Dolores Doré Eccles all helped with generous donations. The State of Utah supported the project through its Economic Development Board, and the University of Utah through the Office of the Vice President for Research. The experimental site became available through the cooperation of the Utah School and Institutional Trust Lands Administration (SITLA), the US Bureau of Land Management, and the US Air Force. We also wish to thank the people and the officials of Millard County, Utah, for their steadfast and warm support. We gratefully acknowledge the contributions from the technical staffs of our home institutions as well as the University of Utah Center for High Performance Computing (CHPC).

PY - 2013

Y1 - 2013

N2 - We present a measurement of the energy spectrum of ultra-high-energy cosmic rays performed by the Telescope Array experiment using monocular observations from its two new FADC-based fluorescence detectors. After a short description of the experiment, we describe the data analysis and event reconstruction procedures. Since the aperture of the experiment must be calculated by Monte Carlo simulation, we describe this calculation and the comparisons of simulated and real data used to verify the validity of the aperture calculation. Finally, we present the energy spectrum calculated from the merged monocular data sets of the two FADC-based detectors, and also the combination of this merged spectrum with an independent, previously published monocular spectrum measurement performed by Telescope Array's third fluorescence detector [T. Abu-Zayyad et al., The energy spectrum of Telescope Array's middle drum detector and the direct comparison to the high resolution fly's eye experiment, Astroparticle Physics 39 (2012) 109-119, http://dx.doi.org/10.1016/j.astropartphys.2012.05. 012, Available from: ]. This combined spectrum corroborates the recently published Telescope Array surface detector spectrum [T. Abu-Zayyad, et al., The cosmic-ray energy spectrum observed with the surface detector of the Telescope Array experiment, ApJ 768 (2013) L1, http://dx.doi.org/10.1088/2041-8205/768/1/L1, Available from: ] with independent systematic uncertainties.

AB - We present a measurement of the energy spectrum of ultra-high-energy cosmic rays performed by the Telescope Array experiment using monocular observations from its two new FADC-based fluorescence detectors. After a short description of the experiment, we describe the data analysis and event reconstruction procedures. Since the aperture of the experiment must be calculated by Monte Carlo simulation, we describe this calculation and the comparisons of simulated and real data used to verify the validity of the aperture calculation. Finally, we present the energy spectrum calculated from the merged monocular data sets of the two FADC-based detectors, and also the combination of this merged spectrum with an independent, previously published monocular spectrum measurement performed by Telescope Array's third fluorescence detector [T. Abu-Zayyad et al., The energy spectrum of Telescope Array's middle drum detector and the direct comparison to the high resolution fly's eye experiment, Astroparticle Physics 39 (2012) 109-119, http://dx.doi.org/10.1016/j.astropartphys.2012.05. 012, Available from: ]. This combined spectrum corroborates the recently published Telescope Array surface detector spectrum [T. Abu-Zayyad, et al., The cosmic-ray energy spectrum observed with the surface detector of the Telescope Array experiment, ApJ 768 (2013) L1, http://dx.doi.org/10.1088/2041-8205/768/1/L1, Available from: ] with independent systematic uncertainties.

UR - http://www.scopus.com/inward/record.url?scp=84880400416&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84880400416&partnerID=8YFLogxK

U2 - 10.1016/j.astropartphys.2013.06.007

DO - 10.1016/j.astropartphys.2013.06.007

M3 - Article

AN - SCOPUS:84880400416

SN - 0927-6505

VL - 48

SP - 16

EP - 24

JO - Astroparticle Physics

JF - Astroparticle Physics

ER -

The energy spectrum of ultra-high-energy cosmic rays measured by the Telescope Array FADC fluorescence detectors in monocular mode

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