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SOLAR CYCLE DEPENDENCE OF THE DIURNAL ANISOTROPY OF 0.6 TeV COSMIC-RAY INTENSITY OBSERVED WITH THE MATSUSHIRO UNDERGROUND MUON DETECTOR
http://hdl.handle.net/10091/10755
http://hdl.handle.net/10091/107550f7066d1-9dd1-41ae-8194-736a237d78e7
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SOLAR_CYCLE_DEPENDENCE_DIURNAL_ANISOTROPY.pdf (395.2 kB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||||||||||||||||
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| 公開日 | 2010-11-04 | |||||||||||||||||||
| タイトル | ||||||||||||||||||||
| タイトル | SOLAR CYCLE DEPENDENCE OF THE DIURNAL ANISOTROPY OF 0.6 TeV COSMIC-RAY INTENSITY OBSERVED WITH THE MATSUSHIRO UNDERGROUND MUON DETECTOR | |||||||||||||||||||
| 言語 | ||||||||||||||||||||
| 言語 | eng | |||||||||||||||||||
| DOI | ||||||||||||||||||||
| 関連識別子 | https://doi.org/10.1088/0004-637X/712/2/1100 | |||||||||||||||||||
| 関連名称 | 10.1088/0004-637X/712/2/1100 | |||||||||||||||||||
| キーワード | ||||||||||||||||||||
| 主題 | cosmic rays, Sun: activity, Sun: heliosphere | |||||||||||||||||||
| 資源タイプ | ||||||||||||||||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||||||||||||||||
| タイプ | journal article | |||||||||||||||||||
| 著者 |
Munakata, K.
× Munakata, K.
× Mizoguchi, Y.
× Kato, C.
× Yasue, S.
× Mori, S.
× Takita, M.
× Kota, J.
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| 信州大学研究者総覧へのリンク | ||||||||||||||||||||
| 氏名 | Munakata, K. | |||||||||||||||||||
| URL | http://soar-rd.shinshu-u.ac.jp/profile/ja.jaDeOUkh.html | |||||||||||||||||||
| 信州大学研究者総覧へのリンク | ||||||||||||||||||||
| 氏名 | Kato, C. | |||||||||||||||||||
| URL | http://soar-rd.shinshu-u.ac.jp/profile/ja.ONfFOUkh.html | |||||||||||||||||||
| 出版者 | ||||||||||||||||||||
| 出版者 | IOP PUBLISHING LTD | |||||||||||||||||||
| 引用 | ||||||||||||||||||||
| 内容記述 | The Astrophysical Journal. 712(2):1100-1106 (2010) | |||||||||||||||||||
| 書誌情報 |
The Astrophysical Journal 巻 412, 号 2, p. 1100-1106, 発行日 2010-04-01 |
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| 抄録 | ||||||||||||||||||||
| 内容記述 | We analyze the temporal variation of the diurnal anisotropy of sub-TeV cosmic-ray intensity observed with the Matsushiro (Japan) underground muon detector over two full solar activity cycles in 1985-2008. We find an anisotropy component in the solar diurnal anisotropy superimposed on the Compton-Getting anisotropy due to Earth's orbital motion around the Sun. The phase of this additional anisotropy is almost constant at similar to 15:00 local solar time corresponding to the direction perpendicular to the average interplanetary magnetic field at Earth's orbit, while the amplitude varies between a maximum (0.043% +/- 0.002%) and minimum (similar to 0.008% +/- 0.002%) in a clear correlation with the solar activity. We find a significant time lag between the temporal variations of the amplitude and the sunspot number (SSN) and obtain the best correlation coefficient of +0.74 with the SSN delayed for 26 months. We suggest that this anisotropy might be interpreted in terms of the energy change due to the solar-wind-induced electric field expected for galactic cosmic rays (GCRs) crossing the wavy neutral sheet. The average amplitude of the sidereal diurnal variation over the entire period is 0.034% +/- 0.003%, which is roughly one-third of the amplitude reported from air shower and deep-underground muon experiments monitoring multi-TeVGCR intensity suggesting a significant attenuation of the anisotropy due to the solar modulation. We find, on the other hand, only a weak positive correlation between the sidereal diurnal anisotropy and the solar activity cycle in which the amplitude in the "active" solar activity epoch is about twice the amplitude in the "quiet" solar activity epoch. This implies that only one-fourth of the total attenuation varies in correlation with the solar activity cycle and/or the solar magnetic cycle. We finally examine the temporal variation of the "single-band valley depth" (SBVD) quoted by the Milagro experiment and, in contrast with recent Milagro's report, we find no steady increase in the Matsushiro observations in a seven-year period between 2000 and 2007. We suggest, therefore, that the steady increase of the SBVD reported by the Milagro experiment is not caused by the decreasing solar modulation in the declining phase of the 23rd solar activity cycle. | |||||||||||||||||||
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| 収録物識別子タイプ | ISSN | |||||||||||||||||||
| 収録物識別子 | 0004-637X | |||||||||||||||||||
| 書誌レコードID | ||||||||||||||||||||
| 収録物識別子タイプ | NCID | |||||||||||||||||||
| 収録物識別子 | AA00553253 | |||||||||||||||||||
| 権利 | ||||||||||||||||||||
| 権利情報 | Copyright (c) 2010 The American Astronomical Society | |||||||||||||||||||
| 出版タイプ | ||||||||||||||||||||
| 出版タイプ | VoR | |||||||||||||||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||||||||||||
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| URL | http://gateway.isiknowledge.com/gateway/Gateway.cgi?&GWVersion=2&SrcAuth=ShinshuUniv&SrcApp=ShinshuUniv&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000275594600027 | |||||||||||||||||||
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Munakata, K., Mizoguchi, Y., Kato, C., Yasue, S., Mori, S., Takita, M., Kota, J., 2010, SOLAR CYCLE DEPENDENCE OF THE DIURNAL ANISOTROPY OF 0.6 TeV COSMIC-RAY INTENSITY OBSERVED WITH THE MATSUSHIRO UNDERGROUND MUON DETECTOR: IOP PUBLISHING LTD, 1100–1106 p.
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