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To reproduce the GIC with any periods, we constructed one-layer model with uniform conductor and calculated the electric field (IEF) induced by By using the convolution of dBy/dt and the step response of the conductor. The IEF is found to be correlated with the GIC for long periods (cc \u003e 0.9), while the GIC-By correlation remains better for short periods. To improve the model, we constructed a two-layer model with highly conductive upper and less conductive lower layers. The IEF is shown to reproduce the GIC with cc \u003e 0.9 for periods ranging from 1 min to 24 h. The model is applied to the GIC measured at lower latitudes in Japan (25.3° GML) with strong By dependence. 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Reproducibility of the Geomagnetically Induced Currents at Middle Latitudes During Space Weather Disturbances
http://hdl.handle.net/10228/00009124
http://hdl.handle.net/10228/000091245ad2e42c-b4bc-42d7-9781-5d1728e0721c
名前 / ファイル | ライセンス | アクション |
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LaSEINE-2021_026.pdf (3.9 MB)
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Item type | 学術雑誌論文 = Journal Article(1) | |||||||||||
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公開日 | 2023-03-16 | |||||||||||
資源タイプ | ||||||||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||
資源タイプ | journal article | |||||||||||
タイトル | ||||||||||||
タイトル | Reproducibility of the Geomagnetically Induced Currents at Middle Latitudes During Space Weather Disturbances | |||||||||||
言語 | ||||||||||||
言語 | eng | |||||||||||
著者 |
Kikuchi, Takashi
× Kikuchi, Takashi× Ebihara, Yusuke× Hashimoto, Kumiko. K.× 北村, 健太郎
WEKO
34939
× Watari, Shin-Ichi |
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抄録 | ||||||||||||
内容記述タイプ | Abstract | |||||||||||
内容記述 | Watari et al. (Space Weather, 2009, 7) found that the geomagnetically induced current (GIC) in Hokkaido, Japan (35.7° geomagnetic latitude (GML)), is well correlated with the y-component magnetic field (By) (correlation coefficients >0.8) and poorly correlated with Bx,z and dBx,y,z/dt/. The linear correlation with By would help predict the GIC, if we have capabilities of reproducing the magnetosphere–ionosphere currents during space weather disturbances. To validate the linear correlation with By for any periods (T) of disturbances, we made correlation analyses for the geomagnetic sudden commencements and pulsations (T = 1–10 min), quasi-periodic DP2 fluctuations (30 min), substorm positive bays (60 min), geomagnetic storms (1–20 h), and quiet-time diurnal variations (8 h). The linear correlation is found to be valid for short periods (cc > 0.8 for T < 1 h) but not for long periods (cc < 0.3 for T> 6 h). To reproduce the GIC with any periods, we constructed one-layer model with uniform conductor and calculated the electric field (IEF) induced by By using the convolution of dBy/dt and the step response of the conductor. The IEF is found to be correlated with the GIC for long periods (cc > 0.9), while the GIC-By correlation remains better for short periods. To improve the model, we constructed a two-layer model with highly conductive upper and less conductive lower layers. The IEF is shown to reproduce the GIC with cc > 0.9 for periods ranging from 1 min to 24 h. The model is applied to the GIC measured at lower latitudes in Japan (25.3° GML) with strong By dependence. The mechanism of the strong By dependence of the GIC remains an issue, but a possible mechanism for the daytime GIC is due to the zeroth-order transverse magnetic (TM0) mode in the Earth-ionosphere waveguide, by which the ionospheric currents are transmitted from the polar to equatorial ionosphere. | |||||||||||
書誌情報 |
Frontiers in Astronomy and Space Sciences 巻 8, p. 759431-1-759431-17, 発行日 2021-10-11 |
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出版社 | ||||||||||||
出版者 | Frontiers | |||||||||||
DOI | ||||||||||||
関連タイプ | isIdenticalTo | |||||||||||
識別子タイプ | DOI | |||||||||||
関連識別子 | https://doi.org/10.3389/fspas.2021.759431 | |||||||||||
日本十進分類法 | ||||||||||||
主題Scheme | NDC | |||||||||||
主題 | 450 | |||||||||||
ISSN | ||||||||||||
収録物識別子タイプ | ISSN | |||||||||||
収録物識別子 | 2296-987X | |||||||||||
著作権関連情報 | ||||||||||||
権利情報 | Copyright (c) 2021 Kikuchi, Ebihara, Hashimoto, Kitamura and Watari. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. | |||||||||||
キーワード | ||||||||||||
主題Scheme | Other | |||||||||||
主題 | geomagnetically induced current (GIC) | |||||||||||
キーワード | ||||||||||||
主題Scheme | Other | |||||||||||
主題 | middle latitude | |||||||||||
キーワード | ||||||||||||
主題Scheme | Other | |||||||||||
主題 | polar-equatorial ionospheric currents | |||||||||||
キーワード | ||||||||||||
主題Scheme | Other | |||||||||||
主題 | TM0 mode in the earth-ionosphere waveguide | |||||||||||
キーワード | ||||||||||||
主題Scheme | Other | |||||||||||
主題 | induced electric field in the two-layer conductivity model | |||||||||||
キーワード | ||||||||||||
主題Scheme | Other | |||||||||||
主題 | geomagnetic by dependence of GIC | |||||||||||
出版タイプ | ||||||||||||
出版タイプ | VoR | |||||||||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||||
査読の有無 | ||||||||||||
値 | yes | |||||||||||
連携ID | ||||||||||||
10855 | ||||||||||||
著者別名 | ||||||||||||
姓名 | Kikuchi, T. | |||||||||||
著者別名 | ||||||||||||
姓名 | Ebihara, Y. | |||||||||||
著者別名 | ||||||||||||
姓名 | Hashimoto, K.K. | |||||||||||
著者別名 | ||||||||||||
姓名 | Kitamura, Kentaro | |||||||||||
言語 | en | |||||||||||
姓名 | 北村, 健太郎 | |||||||||||
言語 | ja | |||||||||||
姓名 | キタムラ, ケンタロウ | |||||||||||
言語 | ja-Kana | |||||||||||
著者別名 | ||||||||||||
姓名 | Watari, S. |