2009 Fiscal Year Final Research Report
Study on short term variation of primary cosmic-ray spectrum with long duration balloon flight
| Project/Area Number |
19340070
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | High Energy Accelerator Research Organization |
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Principal Investigator |
YOSHIMURA Koji High Energy Accelerator Research Organization, 素粒子原子核研究所, 准教授 (50272464)
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| Co-Investigator(Kenkyū-buntansha) |
HASEGAWA Masaya 高エネルギー加速器研究機構, 素粒子原子核研究所, 助教 (60435617)
YAMAMOTO Akira 高エネルギー加速器研究機構, 超伝導低温工学センター, 教授 (30113418)
MAKIDA Yasuhiro 高エネルギー加速器研究機構, 素粒子原子核研究所, 准教授 (30199658)
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| Project Period (FY) |
2007 – 2009
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| Keywords | BESS-Polar / 南極周回飛翔 / 一次宇宙線 / 気球実験 / 太陽活動 / 太陽風 / 太陽変調 / 短期過渡変動 |
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| Research Abstract |
BESS-Polar II experiment was successfully carried out with the improved instruments which enabled precise measurement of daily variation of the primary cosmic-ray spectrum. During 24.5 day scientific observation, about 47 billion cosmic-ray events were observed. After detailed calibration using precise temperature and pressure data, we have obtained the precision proton spectra for the entire flight duration. We have successfully studied daily variation of proton spectrum and investigated its correlation with solar wind.
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