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  1. 学術雑誌論文
  2. 4 自然科学

Seasonal variation of inter-hemispheric field-aligned currents deduced from time-series analysis of the equatorial geomagnetic field data during solar cycle 23-24

http://hdl.handle.net/10228/00009069
http://hdl.handle.net/10228/00009069
d3063d51-7d13-443f-b103-d263ed46235d
名前 / ファイル ライセンス アクション
LaSEINE-2021_015.pdf LaSEINE-2021_015.pdf (1.5 MB)
Item type 学術雑誌論文 = Journal Article(1)
公開日 2023-02-02
タイトル
タイトル Seasonal variation of inter-hemispheric field-aligned currents deduced from time-series analysis of the equatorial geomagnetic field data during solar cycle 23-24
言語
言語 eng
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
著者 Ranasinghe, Manjula

× Ranasinghe, Manjula

WEKO 34606

Ranasinghe, Manjula

Search repository
Fujimoto, Akiko

× Fujimoto, Akiko

WEKO 25636
e-Rad 40578803
Scopus著者ID 7102932224
ORCiD 0000-0001-9686-6228
九工大研究者情報 100001151

Fujimoto, Akiko

Search repository
Yoshikawa, Akimasa

× Yoshikawa, Akimasa

WEKO 34608

Yoshikawa, Akimasa

Search repository
Jayaratne, Chandana

× Jayaratne, Chandana

WEKO 34609

Jayaratne, Chandana

Search repository
抄録
内容記述タイプ Abstract
内容記述 The east–west component of magnetic field variation (∆D-component) at Davao station (Philippines, geomagnetic latitude: – 2.22˚N) are used to investigate the characteristics of the long-term Inter-Hemispheric Field-Aligned Currents (IHFACs) based on the time-series analysis from August 1998 to July 2020. Recent in situ satellite and ground-based observations have reported that dusk-side current polarity of IHFAC is often opposite to that of the noon IHFAC, being inconsistent with Fukushima's IHFACs model. We investigated the consistency of the dusk-side IHFAC polarity derived from the observations with the polarity expected from Fukushima’s IHFACs model and examined the solar cycle dependence of IHFACs. It was confirmed that the dusk-side IHFACs during June and December solstices flow in the same direction of the noontime IHFACs, which was consistent with the IHFAC polarities suggested by the Fukushima model. The dusk-side IHFACs around March and September–November months disagreed with the Fukushima model. The ∆D variations clearly showed seasonal asymmetry in the dawn and noon sectors, whereas the ∆D variations in the dusk sector demonstrated seasonal symmetry. Solar cycle dependence of IHFACs was exhibited in the dusk sector. For the dawn and noon sectors, the yearly peak-to-peak ∆D amplitude in the later solar cycle SC24 decreased by about 35% in comparison with the earlier solar cycle SC23. In contrast, the dusk-side yearly peak-to-peak ∆D amplitude increased by about 200%. The dusk-side IHFAC yearly amplitude tended to be in inverse proportion to solar activity.
書誌情報 Earth, Planets and Space

巻 73, p. 146-1-146-10, 発行日 2021-07-21
出版者
出版者 Springer
ISSN
収録物識別子タイプ ISSN
収録物識別子 1880-5981
DOI
関連タイプ isIdenticalTo
識別子タイプ DOI
関連識別子 https://doi.org/10.1186/s40623-021-01481-6
キーワード
主題Scheme Other
主題 Inter-hemispheric field-aligned currents (IHFACs)
キーワード
主題Scheme Other
主題 Ground-based magnetometer data
キーワード
主題Scheme Other
主題 Equatorial magnetic field
キーワード
主題Scheme Other
主題 Solar cycle SC23 and SC24
キーワード
主題Scheme Other
主題 MAGDAS/CPMN
キーワード
主題Scheme Other
主題 Seasonal variations
キーワード
主題Scheme Other
主題 Fukushima’s model
日本十進分類法
主題Scheme NDC
主題 450
著作権関連情報
権利情報 Copyright (c) The Author(s) 2021. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
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
10844
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