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| ファイル | 記述 | サイズ | フォーマット | |
|---|---|---|---|---|
| s40623-022-01675-6.pdf | 1.03 MB | Adobe PDF | 見る/開く |
| タイトル: | Solar and geomagnetic activity dependence of 150-km echoes observed by the Equatorial Atmosphere Radar in Indonesia |
| 著者: | Yokoyama, Tatsuhiro    https://orcid.org/0000-0001-8392-6455 (unconfirmed)Takagi, Rieko Yamamoto, Mamoru https://orcid.org/0000-0002-4957-764X (unconfirmed) |
| 著者名の別形: | 横山, 竜宏 高木, 理絵子 山本, 衛 |
| キーワード: | Equatorial ionosphere 150-km echoes Equatorial Atmosphere Radar |
| 発行日: | 2022 |
| 出版者: | Springer Nature |
| 誌名: | Earth, Planets and Space |
| 巻: | 74 |
| 論文番号: | 113 |
| 抄録: | 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. |
| 著作権等: | © 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. |
| URI: | http://hdl.handle.net/2433/276977 |
| DOI(出版社版): | 10.1186/s40623-022-01675-6 |
| 出現コレクション: | 学術雑誌掲載論文等 |
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