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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

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/2237/00029468
6c2bff11-a6cf-43f7-b09e-63edb03ca7ef
名前 / ファイル ライセンス アクション
Fujiki2019SolPhys_accepted.pdf Fujiki2019SolPhys_accepted (1.6 MB)
Item type 学術雑誌論文 / Journal Article(1)
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

WEKO 89285

en Fujiki, Ken’ichi

Search repository
Shibasaki, Kiyoto

× Shibasaki, Kiyoto

WEKO 89286

en Shibasaki, Kiyoto

Search repository
Yashiro, Seiji

× Yashiro, Seiji

WEKO 89287

en Yashiro, Seiji

Search repository
Tokumaru, Munetoshi

× Tokumaru, Munetoshi

WEKO 89288

en Tokumaru, Munetoshi

Search repository
Iwai, Kazumasa

× Iwai, Kazumasa

WEKO 89289

en Iwai, Kazumasa

Search repository
Masuda, Satoshi

× Masuda, Satoshi

WEKO 89290

en Masuda, Satoshi

Search repository
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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