Solar and geomagnetic activity dependence of 150-km echoes observed by the Equatorial Atmosphere Radar in Indonesia

• 資料種別: 記事
• タイトル: Solar and geomagnetic activity dependence of 150-km echoes observed by the Equatorial Atmosphere Radar in Indonesia
• 著者・編者: Tatsuhiro Yokoyama; Rieko Takagi; Mamoru Yamamoto
• 出版事項: 日本 : The Society of Geomagnetism and Earth, Planetary and Space Sciences
• 出版年月日等: 2022-07-22
• 出版年（W3CDTF）: 2022-07-22
• タイトル（掲載誌）: EPS : Earth, Planets and Space
• 巻号年月日等（掲載誌）: 74(113)
• 掲載巻: 74(113)
• ISSN（掲載誌）: 1880-5981
• ISSN-L（掲載誌）: 1343-8832
• 本文の言語コード: eng
• DOI: 10.1186/s40623-022-01675-6; https://doi.org/10.1186/s40623-022-01675-6
• 国立国会図書館永続的識別子: info:ndljp/pid/12685400; https://dl.ndl.go.jp/pid/12685400
• コレクション（共通）: 障害者向け資料
• コレクション（障害者向け資料：レベル1）: テキストデータ
• コレクション（個別）: 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > その他; https://dl.ndl.go.jp/collections/B00035
• 収集根拠: オンライン資料収集制度
• 受理日（W3CDTF）: 2023-03-07T16:17:01+09:00
• 保存日（W3CDTF）: 2023-03-07
• 記録形式（IMT）: application/pdf
• オンライン閲覧公開範囲: 国立国会図書館内限定公開
• デジタル化資料送信: 図書館・個人送信対象外
• 遠隔複写可否（NDL）: 可
• 掲載誌（URI）: https://earth-planets-space.springeropen.com/articles
• 掲載誌（国立国会図書館永続的識別子）: info:ndljp/pid/12287068; https://dl.ndl.go.jp/pid/12287068
• 連携機関・データベース: 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

• 要約等: The occurrence characteristics of 150-km echoes in low-latitude regions are studied using the Equatorial Atmosphere Radar (EAR) in Indonesia. The long-term observation of the 150-km echoes by the EAR enables us to study the occurrence characteristics of 150-km echoes statistically. It is shown that the occurrence rate of the 150-km echoes observed by the EAR shows a semiannual variation with two peaks in solstices and a negative correlation with both the EUV flux and ΣKp index, that is, the solar and the geomagnetic activity. Geomagnetic activity correlates with the occurrence rate of 150-km echoes observed one day after when the ΣKp was measured. However, the occurrence rate is always low during the high solar activity period regardless of the geomagnetic activity. While the seasonal variation and the solar activity dependence of the occurrence of 150-km echoes are consistent with previous studies, this is the first time a negative correlation with geomagnetic activity is reported.
• DOI: 10.1186/s40623-022-01675-6; https://doi.org/10.1186/s40623-022-01675-6
• オンライン閲覧公開範囲: インターネット公開
• 著作権情報: © The Author(s) 2022; 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.
• 関連情報（URI）: http://hdl.handle.net/2433/276977; http://id.ndl.go.jp/digimeta/12685400; https://dl.ndl.go.jp/pid/12685400; https://link.springer.com/content/pdf/10.1186/s40623-022-01675-6.pdf; https://link.springer.com/article/10.1186/s40623-022-01675-6/fulltext.html
• 参照: Solved and unsolved riddles about low-latitude daytime valley region plasma waves and 150-km echoes; https://cir.nii.ac.jp/crid/1360865815492456832
• 参照: The Solar Flux Dependence of Ionospheric 150 km Radar Echoes and Implications; https://cir.nii.ac.jp/crid/1360004229807899904; On the Solstice Maxima and Azimuth‐Dependent Characteristics of the 150‐km Echoes Observed Using the Equatorial Atmosphere Radar; https://cir.nii.ac.jp/crid/1360004233291930496; Daytime zonal drifts in the ionospheric 150 km and <i>E</i> regions estimated using EAR observations; https://cir.nii.ac.jp/crid/1360567179761709568; Statistics of 150-km echoes over Jicamarca based on low-power VHF observations; https://cir.nii.ac.jp/crid/1360574094196087936; VIPIR and 50 MHz Radar Studies of Gravity Wave Signatures in 150‐km Echoes Observed at Jicamarca; https://cir.nii.ac.jp/crid/1360580235194936704; The Photoelectron‐Driven Upper Hybrid Instability as the Cause of 150‐km Echoes; https://cir.nii.ac.jp/crid/1360580235194938496; Height Variation of Gaps in 150‐km Echoes and Whole Atmosphere Community Climate Model Electron Densities Suggest Link to Upper Hybrid Resonance; https://cir.nii.ac.jp/crid/1360580238413799808; On the Type‐A and Type‐B 150‐km Radar Echoes; https://cir.nii.ac.jp/crid/1360580239843427200; High resolution observations of 150 km echoes at Jicamarca; https://cir.nii.ac.jp/crid/1360855569815177088; Solar Flare Effects on 150‐km Echoes Observed Over Jicamarca: WACCM‐X Simulations; https://cir.nii.ac.jp/crid/1360857598039630848; Unexpected characteristics of the 150 km echoes observed over Gadanki and their implications; https://cir.nii.ac.jp/crid/1361418518635286656; Radar observations of daytime 150‐km echoes from outside the equatorial electrojet belt over Gadanki; https://cir.nii.ac.jp/crid/1361418520896915072; Sq and EEJ—A Review on the Daily Variation of the Geomagnetic Field Caused by Ionospheric Dynamo Currents; https://cir.nii.ac.jp/crid/1361418521502715264; A comparative study of equatorial daytime vertical E × B drift in the Indian and Indonesian sectors based on 150 km echoes; https://cir.nii.ac.jp/crid/1361699995917503872; Interaction between direct penetration and disturbance dynamo electric fields in the storm‐time equatorial ionosphere; https://cir.nii.ac.jp/crid/1361981469343205248; Equatorial Atmosphere Radar (EAR): System description and first results; https://cir.nii.ac.jp/crid/1361981470352650752; Descending ion layer property in the Gadanki radar observations of 150 km echoes and its implication to the echoing phenomenon; https://cir.nii.ac.jp/crid/1362262944137156096; Daytime 150‐km echoes observed with the Equatorial Atmosphere Radar in Indonesia: First results; https://cir.nii.ac.jp/crid/1362262945840127232; Evidence of a stratified echoing region at 150 kilometers in the vicinity of the magnetic equator during daylight hours; https://cir.nii.ac.jp/crid/1362262945955317376; Zonal asymmetry of daytime 150-km echoes observed by Equatorial Atmosphere Radar in Indonesia; https://cir.nii.ac.jp/crid/1362825894499134208; Discovery of two distinct types of equatorial 150 km radar echoes; https://cir.nii.ac.jp/crid/1363388845767442688; On a summer maximum in the occurrence frequency of 150 km (<i>F</i>₁) radar echoes over Pohnpei; https://cir.nii.ac.jp/crid/1363670318295589248; Naturally enhanced ion-line spectra around the equatorial 150-km region; https://cir.nii.ac.jp/crid/1363670319993411456; Photoelectron‐induced waves: A likely source of 150 km radar echoes and enhanced electron modes; https://cir.nii.ac.jp/crid/1363951793622465920; On the characteristics of 150-km echoes observed in the Brazilian longitude sector by the 30 MHz São Luís radar; https://cir.nii.ac.jp/crid/1364233270675085056; International Geomagnetic Reference Field : the thirteenth generation; https://cir.nii.ac.jp/crid/2050025942148530688
• 連携機関・データベース: 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
• 提供元機関・データベース: 学術機関リポジトリデータベース; https://irdb.nii.ac.jp; 雑誌記事索引データベース; https://ndlsearch.ndl.go.jp; Crossref; https://www.crossref.org; 科学研究費助成事業データベース; https://kaken.nii.ac.jp/ja
• 書誌ID（NDLBibID）: 12685400; http://id.ndl.go.jp/bib/12685400