Item type |
itemtype_ver1(1) |
公開日 |
2023-03-03 |
タイトル |
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タイトル |
Interplanetary Scintillation Observations of Solar-Wind Disturbances During Cycles 23 and 24 |
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言語 |
en |
著者 |
Tokumaru, Munetoshi
Fujiki, Ken’ichi
Iwai, Kazumasa
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アクセス権 |
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アクセス権 |
open access |
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アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
権利 |
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言語 |
en |
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権利情報 |
This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s11207-023-02116-7 |
キーワード |
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主題Scheme |
Other |
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主題 |
Solar wind |
キーワード |
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主題Scheme |
Other |
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主題 |
Space weather |
キーワード |
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主題Scheme |
Other |
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主題 |
Solar cycle |
内容記述 |
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内容記述タイプ |
Abstract |
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内容記述 |
Interplanetary scintillation (IPS) analysis is an effective technique for remotely sensing solar-wind disturbances, such as stream-interaction regions (SIRs) and coronal mass ejections (CMEs), which are the main drivers of space weather. Here, we employed 327-MHz IPS observations conducted at the Institute of Space–Earth Environmental Research, Nagoya University for the period of 1997 – 2019 to determine IPS indices that represent the density-fluctuation level of the inner heliosphere. We then compared these indices with the solar-wind density and speed measured near the Earth. Consequently, we found weak but significant positive correlations between the IPS indices and both the solar-wind density and speed gradient at a time lag of 0 days. This suggests that an increase in IPS indices corresponds to the arrival of the compression region associated with SIR or CME at the Earth, which is consistent with model calculations. Significant negative correlations were observed between the IPS and disturbance storm time (Dst) indices at a time lag of a few days; however, the correlations were too weak to enable reliable predictions of space weather. Possible reasons for these weak correlations are also discussed. Using the IPS indices, we determined the solar-cycle variation in the occurrence rate of solar-wind disturbances for the analysis period. The occurrence rates exhibited two maxima corresponding to the solar maximum and minimum, which are generally consistent with the combined effects of CME and SIR. The lower occurrence rates in Cycle 24 than in Cycle 23 reflect a weaker solar activity. These results suggest that the proposed IPS indices are useful for studying the long-term characteristics of solar-wind disturbances. |
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言語 |
en |
出版者 |
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出版者 |
Springer |
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言語 |
en |
言語 |
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言語 |
eng |
資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
出版タイプ |
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出版タイプ |
AM |
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出版タイプResource |
http://purl.org/coar/version/c_ab4af688f83e57aa |
関連情報 |
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関連タイプ |
isVersionOf |
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識別子タイプ |
DOI |
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関連識別子 |
https://doi.org/10.1007/s11207-023-02116-7 |
収録物識別子 |
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収録物識別子タイプ |
PISSN |
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収録物識別子 |
0038-0938 |
書誌情報 |
en : Solar Physics
巻 298,
号 2,
p. 298,
発行日 2023-02-13
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ファイル公開日 |
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日付 |
2024-02-13 |
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日付タイプ |
Available |