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2021SW002878.pdf | 3.4 MB | Adobe PDF | 見る/開く |
タイトル: | High‐Resolution 3‐D Imaging of Daytime Sporadic‐E Over Japan by Using GNSS TEC and Ionosondes |
著者: | Fu, Weizheng Ssessanga, Nicholas Yokoyama, Tatsuhiro https://orcid.org/0000-0001-8392-6455 (unconfirmed) Yamamoto, Mamoru https://orcid.org/0000-0002-4957-764X (unconfirmed) |
著者名の別形: | 横山, 竜宏 山本, 衛 |
キーワード: | ionosphere sporadic E tomography TEC |
発行日: | Dec-2021 |
出版者: | American Geophysical Union (AGU) |
誌名: | Space Weather |
巻: | 19 |
号: | 12 |
論文番号: | e2021SW002878 |
抄録: | A novel two-step three-dimensional (3-D) computerized ionospheric tomography (CIT) technique has been developed to image the structure of daytime midlatitude sporadic-E (Es). The CIT relies on total electron content (TEC) from a dense ground-based Global Navigation Satellite System (GNSS) receiver network over the Japan area. First, on a coarse grid, the TEC data and a multiplicative algebraic reconstruction technique (MART) are used to reconstruct the F region from a smooth background. Then, on a fine grid and using singular value decomposition (SVD), the residues after deducting the F region contribution to TEC are utilized in reconstructing the E region, extending 80–180 km in altitude. To vertically constrain the E region solution, we introduced a family of subsets of time-dependent empirical orthogonal functions (EOFs) from a Chapman model function tuned to manually scaled ionosonde observations. We analyzed three event days to validate the results. East-West (E-W) aligned frontal structures, spanning several hundred kilometers, migrating northward in the morning and southward in the afternoon, were observed. The new technique effectively tracks the Es-height variation over time, which had proved difficult to reproduce in earlier tempts at 3-D Es reconstructions. |
著作権等: | © 2021. The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made. |
URI: | http://hdl.handle.net/2433/269107 |
DOI(出版社版): | 10.1029/2021SW002878 |
出現コレクション: | 学術雑誌掲載論文等 |
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