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Time Variations of Cosmic-Ray Helium Isotopes with BESS-Polar IThe Balloon-borne Experiment with a Superconducting Spectrometer (BESS) is configured with a solenoidal superconducting magnet and a suite of precision particle detectors, including time-of-flight hodoscopes based on plastic scintillators, a silica-aerogel Cherenkov detector, and a high resolution tracking system with a central jet-type drift chamber. The charges of incident particles are determined from energy losses in the scintillators. Their magnetic rigidities (momentum/charge) are measured by reconstructing each particle trajectory in the magnetic field, and their velocities are obtained by using the time-of-flight system. Together, these measurements can accurately identify helium isotopes among the incoming cosmic-ray helium nuclei up to energies in the GeV per nucleon region. The BESS-Polar I instrument flew for 8.5 days over Antarctica from December 13th to December 21st, 2004. Its long-duration flight and large geometric acceptance allow the time variations of isotopic fluxes to be studied for the first time. The time variations of helium isotope fluxes are presented here for rigidities from 1.2 to 2.5 GV and results are compared to previously reported proton data and neutron monitor data.
Document ID
20150007719
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1016/j.asr.2013.09.028
Authors
Abe, K. (Kobe Univ. Hyogo, Japan)
Fuke, H. (Japan Aerospace Exploration Agency Kanagawa, Japan)
Haino, S. (High Energy Accelerator Research Organization Ibaraki, Japan)
Hams, T. (Maryland Univ. Baltimore County Baltimore, MD, United States)
Hasegawa, M. (High Energy Accelerator Research Organization Ibaraki, Japan)
Horikoshi, A. (High Energy Accelerator Research Organization Ibaraki, Japan)
Itazaki, A. (Kobe Univ. Hyogo, Japan)
Kim, K. C. (Maryland Univ. College Park, MD, United States)
Kumazawa, T. (High Energy Accelerator Research Organization Ibaraki, Japan)
Kusumoto, A. (Kobe Univ. Hyogo, Japan)
Lee, M. H.. (Maryland Univ. College Park, MD, United States)
Makida, Y. (High Energy Accelerator Research Organization Ibaraki, Japan)
Matsuda, S. (High Energy Accelerator Research Organization Ibaraki, Japan)
Matsukawa, Y. (Kobe Univ. Hyogo, Japan)
Matsumoto, K. (High Energy Accelerator Research Organization Ibaraki, Japan)
Mitchell, J. W. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Moiseev, A. A. (Maryland Univ. Baltimore County Baltimore, MD, United States)
Nishimura, J. (Maryland Univ. College Park, MD, United States)
Nozaki, M. (High Energy Accelerator Research Organization Ibaraki, Japan)
Orito, R. (Kobe Univ. Hyogo, Japan)
Ormes, J. F. (Denver Univ. Denver, CO, United States)
Picot-Clemente, N. (Maryland Univ. College Park, MD, United States)
Sakai, K. (Maryland Univ. Baltimore County Baltimore, MD, United States)
Sasaki, M. (Maryland Univ. Baltimore County Baltimore, MD, United States)
Seo, E. S. (Maryland Univ. College Park, MD, United States)
Shikaze, Y. (Kobe Univ. Hyogo, Japan)
Streitmatter, R. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
May 8, 2015
Publication Date
October 2, 2013
Publication Information
Publication: Advances in Space Research
Publisher: Elsevier Ltd. on behalf of COSPAR
Volume: 53
Issue: 10
Subject Category
Astronomy
Report/Patent Number
GSFC-E-DAA-TN17148
Funding Number(s)
CONTRACT_GRANT: NSF ATM-0000315
CONTRACT_GRANT: NNG06EO90A
CONTRACT_GRANT: KAKEN-Hi 13001004
CONTRACT_GRANT: KAKEN-Hi 18104006
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Cosmic-ray flux time variations
Cosmic-ray isotopes
Solar modulation

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