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LONG-TERM VARIATION OF THE SOLAR DIURNAL ANISOTROPY OF GALACTIC COSMIC RAYS OBSERVED WITH THE NAGOYA MULTI-DIRECTIONAL MUON DETECTOR
http://hdl.handle.net/10091/00020602
http://hdl.handle.net/10091/0002060240016dfc-4f75-4473-9b8b-22ffc0b031cd
名前 / ファイル | ライセンス | アクション |
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2018-05-10 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | LONG-TERM VARIATION OF THE SOLAR DIURNAL ANISOTROPY OF GALACTIC COSMIC RAYS OBSERVED WITH THE NAGOYA MULTI-DIRECTIONAL MUON DETECTOR | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | cosmic rays | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | methods: data analysis | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Sun: heliosphere | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Sun: magnetic fields | |||||
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.× Kozai, M.× Kato, C.× 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 | ||||||
内容記述タイプ | Other | |||||
内容記述 | ASTROPHYSICAL JOURNAL. 791(1):22 (2014) | |||||
書誌情報 |
ASTROPHYSICAL JOURNAL 巻 791, 号 1, p. 22, 発行日 2014-08-10 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We analyze the three-dimensional anisotropy of the galactic cosmic ray (GCR) intensities observed independently with a muon detector at Nagoya in Japan and neutron monitors over four solar activity cycles. We clearly see the phase of the free-space diurnal anisotropy shifting toward earlier hours around solar activity minima in A > 0 epochs, due to the reduced anisotropy component parallel to the mean magnetic field. This component is consistent with a rigidity-independent spectrum, while the perpendicular anisotropy component increases with GCR rigidity. We suggest that this harder spectrum of the perpendicular component is due to contribution from the drift streaming. We find that the bi-directional latitudinal density gradient is positive in theA > 0 epoch, while it is negative in the A < 0 epoch, in agreement with the drift model prediction. The radial density gradient of GCRs, on the other hand, varies with a similar to 11 yr cycle with maxima (minima) in solar maximum (minimum) periods, but we find no significant difference between the radial gradients in the A > 0 and A < 0 epochs. The corresponding parallel mean free path is larger in A < 0 than in A > 0. We also find, however, that the parallel mean free path (radial gradient) appears to persistently increase (decrease) in the last three cycles of weakening solar activity. We suggest that simple differences between these parameters in A > 0 and A < 0 epochs are seriously biased by these long-term trends. | |||||
資源タイプ(コンテンツの種類) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Article | |||||
ISSN | ||||||
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 | AA00553242 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1088/0004-637X/791/1/22 | |||||
関連名称 | 10.1088/0004-637X/791/1/22 | |||||
権利 | ||||||
権利情報 | © 2014 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 | |||||
WoS | ||||||
表示名 | Web of Science | |||||
URL | http://gateway.isiknowledge.com/gateway/Gateway.cgi?&GWVersion=2&SrcAuth=ShinshuUniv&SrcApp=ShinshuUniv&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000339657700022 |