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  1. 040 理学部
  2. 0401 学術論文

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/10091/00020602
40016dfc-4f75-4473-9b8b-22ffc0b031cd
名前 / ファイル ライセンス アクション
Munakata_2014_ApJ_791_22.pdf Munakata_2014_ApJ_791_22.pdf (1.2 MB)
Item type 学術雑誌論文 / Journal Article(1)
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.

WEKO 105565

Munakata, K.

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Kozai, M.

× Kozai, M.

WEKO 105566

Kozai, M.

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Kato, C.

× Kato, C.

WEKO 105567

Kato, C.

Search repository
Kota, J.

× Kota, J.

WEKO 105568

Kota, J.

Search repository
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
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
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