Transient variations in cosmic ray proton fluxes from BESS-Polar I

N. Thakur; K. Abe; H. Fuke; S. Haino; T. Hams; A. Itazaki; K. C. Kim; T. Kumazawa; M. H. Lee; Y. Makida; S. Matsuda; K. Matsumoto; J. W. Mitchell; Z. Myers; J. Nishimura; M. Nozaki; R. Orito; J. F. Ormes; M. Sasaki; E. S. Seo; Y. Shikaze; R. E. Streitmatter; J. Suzuki; Y. Takasugi; K. Takeuchi; K. Tanaka; T. Yamagami; A. Yamamoto; T. Yoshida; K. Yoshimura

doi:10.7529/ICRC2011/V02/1247

Transient variations in cosmic ray proton fluxes from BESS-Polar I

N. Thakur, K. Abe, H. Fuke, S. Haino, T. Hams, A. Itazaki, K. C. Kim, T. Kumazawa, M. H. Lee, Y. Makida, S. Matsuda, K. Matsumoto, J. W. Mitchell, Z. Myers, J. Nishimura, M. Nozaki, R. Orito, J. F. Ormes, M. Sasaki, E. S. SeoY. Shikaze, R. E. Streitmatter, J. Suzuki, Y. Takasugi, K. Takeuchi, K. Tanaka, T. Yamagami, A. Yamamoto, T. Yoshida, K. Yoshimura

Research output: Contribution to conference › Paper › peer-review

Abstract

BESS (Balloon-borne Experiment with a Superconducting Spectrometer) had its first circumpolar flight from Williams Field near McMurdo Station, Antarctica from Dec. 13 to 21, 2004. Our sub-1% precision reveals BESS-Polar I proton fluxes exhibit transient variations at the few1% level. The time progression of proton flux has three main features; a rising flux at the beginning of the flight, a transition region around Dec. 17, followed by quasi-periodic variation. Neutron monitor data show that the BESS-Polar I flight occurred during the recovery phase of a small Forbush decrease. The solar wind plasma and particle data show that this flight took place during the tail end of a high-energy, multiple-eruption solar energetic particle (SEP) event. A high speed solar wind stream arrived near the Earth around Dec. 17, 2004. We present the flux progression as a function of energy between 0.1 - 100.0 GeV and suggest possible physical interpretations.

Original language	English
Pages	220-223
Number of pages	4
DOIs	https://doi.org/10.7529/ICRC2011/V02/1247
Publication status	Published - 2011
Externally published	Yes
Event	32nd International Cosmic Ray Conference, ICRC 2011 - Beijing, China Duration: Aug 11 2011 → Aug 18 2011

Other

Other	32nd International Cosmic Ray Conference, ICRC 2011
Country/Territory	China
City	Beijing
Period	8/11/11 → 8/18/11

Keywords

BESS-polar I
CIR
Diurnal variations
Proton fluxes
Short-term variations
Turbulent interaction regions

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.7529/ICRC2011/V02/1247

Cite this

Thakur, N., Abe, K., Fuke, H., Haino, S., Hams, T., Itazaki, A., Kim, K. C., Kumazawa, T., Lee, M. H., Makida, Y., Matsuda, S., Matsumoto, K., Mitchell, J. W., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sasaki, M., ... Yoshimura, K. (2011). Transient variations in cosmic ray proton fluxes from BESS-Polar I. 220-223. Paper presented at 32nd International Cosmic Ray Conference, ICRC 2011, Beijing, China. https://doi.org/10.7529/ICRC2011/V02/1247

Thakur, N, Abe, K, Fuke, H, Haino, S, Hams, T, Itazaki, A, Kim, KC, Kumazawa, T, Lee, MH, Makida, Y, Matsuda, S, Matsumoto, K, Mitchell, JW, Myers, Z, Nishimura, J, Nozaki, M, Orito, R, Ormes, JF, Sasaki, M, Seo, ES, Shikaze, Y, Streitmatter, RE, Suzuki, J, Takasugi, Y, Takeuchi, K, Tanaka, K, Yamagami, T, Yamamoto, A, Yoshida, T & Yoshimura, K 2011, 'Transient variations in cosmic ray proton fluxes from BESS-Polar I', Paper presented at 32nd International Cosmic Ray Conference, ICRC 2011, Beijing, China, 8/11/11 - 8/18/11 pp. 220-223. https://doi.org/10.7529/ICRC2011/V02/1247

@conference{fdcfc1bd97424f0db50b6f60cf56a609,

title = "Transient variations in cosmic ray proton fluxes from BESS-Polar I",

abstract = "BESS (Balloon-borne Experiment with a Superconducting Spectrometer) had its first circumpolar flight from Williams Field near McMurdo Station, Antarctica from Dec. 13 to 21, 2004. Our sub-1% precision reveals BESS-Polar I proton fluxes exhibit transient variations at the few1% level. The time progression of proton flux has three main features; a rising flux at the beginning of the flight, a transition region around Dec. 17, followed by quasi-periodic variation. Neutron monitor data show that the BESS-Polar I flight occurred during the recovery phase of a small Forbush decrease. The solar wind plasma and particle data show that this flight took place during the tail end of a high-energy, multiple-eruption solar energetic particle (SEP) event. A high speed solar wind stream arrived near the Earth around Dec. 17, 2004. We present the flux progression as a function of energy between 0.1 - 100.0 GeV and suggest possible physical interpretations.",

keywords = "BESS-polar I, CIR, Diurnal variations, Proton fluxes, Short-term variations, Turbulent interaction regions",

author = "N. Thakur and K. Abe and H. Fuke and S. Haino and T. Hams and A. Itazaki and Kim, {K. C.} and T. Kumazawa and Lee, {M. H.} and Y. Makida and S. Matsuda and K. Matsumoto and Mitchell, {J. W.} and Z. Myers and J. Nishimura and M. Nozaki and R. Orito and Ormes, {J. F.} and M. Sasaki and Seo, {E. S.} and Y. Shikaze and Streitmatter, {R. E.} and J. Suzuki and Y. Takasugi and K. Takeuchi and K. Tanaka and T. Yamagami and A. Yamamoto and T. Yoshida and K. Yoshimura",

year = "2011",

doi = "10.7529/ICRC2011/V02/1247",

language = "English",

pages = "220--223",

note = "32nd International Cosmic Ray Conference, ICRC 2011 ; Conference date: 11-08-2011 Through 18-08-2011",

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T1 - Transient variations in cosmic ray proton fluxes from BESS-Polar I

AU - Thakur, N.

AU - Abe, K.

AU - Fuke, H.

AU - Haino, S.

AU - Hams, T.

AU - Itazaki, A.

AU - Kim, K. C.

AU - Kumazawa, T.

AU - Lee, M. H.

AU - Makida, Y.

AU - Matsuda, S.

AU - Matsumoto, K.

AU - Mitchell, J. W.

AU - Myers, Z.

AU - Nishimura, J.

AU - Nozaki, M.

AU - Orito, R.

AU - Ormes, J. F.

AU - Sasaki, M.

AU - Seo, E. S.

AU - Shikaze, Y.

AU - Streitmatter, R. E.

AU - Suzuki, J.

AU - Takasugi, Y.

AU - Takeuchi, K.

AU - Tanaka, K.

AU - Yamagami, T.

AU - Yamamoto, A.

AU - Yoshida, T.

AU - Yoshimura, K.

PY - 2011

Y1 - 2011

N2 - BESS (Balloon-borne Experiment with a Superconducting Spectrometer) had its first circumpolar flight from Williams Field near McMurdo Station, Antarctica from Dec. 13 to 21, 2004. Our sub-1% precision reveals BESS-Polar I proton fluxes exhibit transient variations at the few1% level. The time progression of proton flux has three main features; a rising flux at the beginning of the flight, a transition region around Dec. 17, followed by quasi-periodic variation. Neutron monitor data show that the BESS-Polar I flight occurred during the recovery phase of a small Forbush decrease. The solar wind plasma and particle data show that this flight took place during the tail end of a high-energy, multiple-eruption solar energetic particle (SEP) event. A high speed solar wind stream arrived near the Earth around Dec. 17, 2004. We present the flux progression as a function of energy between 0.1 - 100.0 GeV and suggest possible physical interpretations.

AB - BESS (Balloon-borne Experiment with a Superconducting Spectrometer) had its first circumpolar flight from Williams Field near McMurdo Station, Antarctica from Dec. 13 to 21, 2004. Our sub-1% precision reveals BESS-Polar I proton fluxes exhibit transient variations at the few1% level. The time progression of proton flux has three main features; a rising flux at the beginning of the flight, a transition region around Dec. 17, followed by quasi-periodic variation. Neutron monitor data show that the BESS-Polar I flight occurred during the recovery phase of a small Forbush decrease. The solar wind plasma and particle data show that this flight took place during the tail end of a high-energy, multiple-eruption solar energetic particle (SEP) event. A high speed solar wind stream arrived near the Earth around Dec. 17, 2004. We present the flux progression as a function of energy between 0.1 - 100.0 GeV and suggest possible physical interpretations.

KW - BESS-polar I

KW - CIR

KW - Diurnal variations

KW - Proton fluxes

KW - Short-term variations

KW - Turbulent interaction regions

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EP - 223

T2 - 32nd International Cosmic Ray Conference, ICRC 2011

Y2 - 11 August 2011 through 18 August 2011

ER -

Transient variations in cosmic ray proton fluxes from BESS-Polar I

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Keywords

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