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Comparative Study of Microwave Polar Brightening, Coronal Holes, and Solar Wind over the Solar Poles
http://hdl.handle.net/2237/00029468
http://hdl.handle.net/2237/000294686c2bff11-a6cf-43f7-b09e-63edb03ca7ef
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 | 2019-03-12 | |||||
タイトル | ||||||
タイトル | Comparative Study of Microwave Polar Brightening, Coronal Holes, and Solar Wind over the Solar Poles | |||||
言語 | en | |||||
著者 |
Fujiki, Ken’ichi
× Fujiki, Ken’ichi× Shibasaki, Kiyoto× Yashiro, Seiji× Tokumaru, Munetoshi× Iwai, Kazumasa× Masuda, Satoshi |
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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 | “This is a post-peer-review, pre-copyedit version of an article published in [Solar Physics]. The final authenticated version is available online at: http://dx.doi.org/10.1007/s11207-019-1418-6”. | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Solar wind | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Interplanetary scintillation | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Radioheliograph | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Coronal holes | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Magnetic fields | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Solar Cycle | |||||
抄録 | ||||||
内容記述 | We compared the long-term variation (1992–2017) in solar polar brightening observed with the Nobeyama Radioheliograph, the polar solar-wind velocity with interplanetary scintillation observations at the Institute for Space-Earth Environmental Research, and the coronal-hole distribution computed by potential-field calculations of the solar corona using synoptic magnetogram data obtained at the National Solar Observatory/Kitt Peak. First, by comparing the solar-wind velocity [V] and the brightness temperature [Tb] in the polar region, we found good correlation coefficients (CCs) between V and Tb in the polar regions, CC = 0.91 (0.83) for the northern (southern) polar region, and we obtained the V–Tb relationship as V=12.6(Tb−10,667)^1/2+432. We also confirmed that the CC of V–Tb is higher than those of V–B and V–B/f, where B and f are the polar magnetic-field strength and magnetic-flux expansion rate, respectively. These results indicate that Tb is a more direct parameter than B or B/f for expressing solar-wind velocity. Next, we analyzed the long-term variation of the polar brightening and its relation to the area of the polar coronal hole [A]. As a result, we found that the polar brightening matches the probability distribution of the predicted coronal hole and that the CC between Tb and A is remarkably high, CC = 0.97. This result indicates that the polar brightening is strongly coupled to the size of the polar coronal hole. Therefore, the reasonable correlation of V – Tb is explained by V – A. In addition, by considering the anti-correlation between A and f found in a previous study, we suggest that the V – Tb relationship is another expression of the Wang–Sheeley relationship (V – 1/f) in the polar regions. | |||||
言語 | en | |||||
内容記述タイプ | Abstract | |||||
内容記述 | ||||||
内容記述 | ファイル公開:2020/03/01 | |||||
言語 | ja | |||||
内容記述タイプ | Other | |||||
出版者 | ||||||
言語 | en | |||||
出版者 | Springer | |||||
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 | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1007/s11207-019-1418-6 | |||||
ISSN(print) | ||||||
収録物識別子タイプ | PISSN | |||||
収録物識別子 | 0038-0938 | |||||
ISSN(Online) | ||||||
収録物識別子タイプ | EISSN | |||||
収録物識別子 | 1573-093X | |||||
書誌情報 |
en : Solar Physics 巻 294, 号 3, p. 30, 発行日 2019-03 |
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著者版フラグ | ||||||
値 | author |