Amplitude enhancement of short period GPS-TEC oscillations over rainfall area

• Material Type: 記事
• Title: Amplitude enhancement of short period GPS-TEC oscillations over rainfall area
• Author/Editor: Toshihiko Iyemori; Akiyasu Yamada; Tadashi Aoyama
• Publication, Distribution, etc.: 日本 : Springer Nature
• Publication Date: 2022-04-02
• Publication Date (W3CDTF): 2022-04-02
• Periodical title: EPS : Earth, Planets and Space
• No. or year of volume/issue: 74(45)
• Volume: 74(45)
• ISSN (Periodical Title): 1880-5981
• ISSN-L (Periodical Title): 1343-8832
• Text Language Code: eng
• DOI: 10.1186/s40623-022-01604-7; https://doi.org/10.1186/s40623-022-01604-7
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• Date Accepted (W3CDTF): 2022-05-18T20:14:28+09:00
• Date Captured (W3CDTF): 2022-04-27
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• Summary, etc.: Correlation between rainfall and short period GPS-TEC (total electron content) variations are investigated by using the precipitation data obtained on the ground and estimated from satellite observations (JAXA/GSMaP) as a proxy of lower atmospheric wave activity. The GPS-TEC data obtained at a tropical station, PHIM, in Phimai, Thailand, for 2014–2020, and the data obtained at a mid-latitude station, NAKG, in Tokara Nakanoshima Island, Japan, for 2017–2019, are examined. A statistical analysis of MEM (maximum entropy method) power spectral density (PSD) in the period range from 50 to 1200 s over PHIM clearly shows an enhancement in the cases of rainfall from that in no-rainfall cases, in particular, on the dusk side. The enhancement is observed both acoustic wave periods less than 5–6 min and internal gravity wave periods more than 10 min. The enhancement after sunset could be an effect of strong rainfall more frequent on the dusk side than that in other local time, or it could suggest the importance of ionospheric electron density profile change for the TEC variation. On the other hand, the PSD does not show such clear enhancement over NAKG on the dusk side, although it shows a small enhancement on both dayside and night-side. A clear PSD bulge near the main vertical acoustic resonance periods, i.e., around 275 s, appears in the average PSD profile of the TEC at PHIM, which suggests that the resonance effect contribute to some extent the PSD enhancement under rainy condition. An event analysis also suggests the contribution of acoustic resonance to the enhancement of the short period TEC variation. A complicated spatial distribution of TEC oscillation over a rainfall area around PHIM, where the TEC oscillations with various periods co-exist, is presented.
• DOI: 10.1186/s40623-022-01604-7; https://doi.org/10.1186/s40623-022-01604-7
• Access Restrictions: インターネット公開
• Rights (production): © 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.
• Related Material (URI): http://hdl.handle.net/2433/282051; http://id.ndl.go.jp/digimeta/12287113; https://dl.ndl.go.jp/pid/12287113; https://link.springer.com/content/pdf/10.1186/s40623-022-01604-7.pdf; https://link.springer.com/article/10.1186/s40623-022-01604-7/fulltext.html
• Is Referenced By: A confirmation of vertical acoustic resonance and field-aligned current generation just after the 2022 Hunga Tonga Hunga Ha'apai volcanic eruption; https://cir.nii.ac.jp/crid/2050870367085219584
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• Bibliographic ID (NDL): 12287113; http://id.ndl.go.jp/bib/12287113