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  1. F300 宇宙地球環境研究所
  2. F300a 雑誌掲載論文
  3. 学術雑誌

Global Distribution of the Solar Wind Speed Reconstructed from Improved Tomographic Analysis of Interplanetary Scintillation Observations between 1985 and 2019

http://hdl.handle.net/2237/0002001977
http://hdl.handle.net/2237/0002001977
6acb90ba-da0f-4a46-91fc-8bc56d84f50f
名前 / ファイル ライセンス アクション
Tokumaru_2021_ApJ_922_73.pdf Tokumaru_2021_ApJ_922_73.pdf (4.1 MB)
Item type itemtype_ver1(1)
公開日 2022-01-20
タイトル
タイトル Global Distribution of the Solar Wind Speed Reconstructed from Improved Tomographic Analysis of Interplanetary Scintillation Observations between 1985 and 2019
言語 en
著者 Tokumaru, Munetoshi

× Tokumaru, Munetoshi

en Tokumaru, Munetoshi

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Fujiki, Ken’ichi

× Fujiki, Ken’ichi

en Fujiki, Ken’ichi

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Kojima, Masayoshi

× Kojima, Masayoshi

en Kojima, Masayoshi

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Iwai, Kazumasa

× Iwai, Kazumasa

en Iwai, Kazumasa

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 © 2021. The American Astronomical Society
内容記述
内容記述 Computer-assisted tomography (CAT) for interplanetary scintillation (IPS) observations enables the determination of the global distribution of solar wind speed. We compared solar wind speeds derived from the CAT analysis of IPS observations between 1985 and 2019 with in situ observations conducted by the near-Earth and Ulysses spacecraft. From this comparison, we found that solar wind speeds from the IPS observations for 2009–2019 were systematically higher than the in situ observations, whereas those for the period until 2008 were in good agreement with the in situ observations. Further, we found that the discrepancy between IPS and the in situ observations is improved by changing the power index of the empirical relation between the solar wind speed and density fluctuations. The CAT analysis using an optimal value for the power index determined from the comparison between IPS and in situ observations revealed long-term variations in the solar wind speed distribution over three cycles, leading to a better understanding of the time-varying global heliosphere. We found that polar solar winds become highly anisotropic at the Cycle 24/25 minimum, which is a peculiar aspect of this minimum. The IPS observations showed general agreement with the Parker Solar Probe observations around the perihelion of Orbit 1; this supports the reliability of the CAT analysis. The results of this study suggest that the physical properties of solar wind microturbulence may vary with a long-term decline in the solar activity, which provides important implication on the solar wind acceleration.
言語 en
内容記述タイプ Abstract
出版者
言語 en
出版者 IOP publishing
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
関連情報
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.3847/1538-4357/ac1862
収録物識別子
収録物識別子タイプ PISSN
収録物識別子 0004-637X
書誌情報 en : The Astrophysical Journal

巻 922, 号 1, p. 73, 発行日 2021-11-23
ファイル公開日
日付 2022-01-20
日付タイプ Available
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