Using Principal Component Analysis of Satellite and Ground Magnetic Data to Model the Equatorial Electrojet and Derive Its Tidal Composition

Gabriel Soares, Yosuke Yamazaki, Achim Morschhauser, Jürgen Matzka, Katia J. Pinheiro, Claudia Stolle, Patrick Alken, Akimasa Yoshikawa, Kornyanat Hozumi, Atul Kulkarni, Pornchai Supnithi

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)

抄録

The intensity of the equatorial electrojet (EEJ) shows temporal and spatial variability that is not yet fully understood nor accurately modeled. Atmospheric solar tides are among the main drivers of this variability but determining different tidal components and their respective time series is challenging. It requires good temporal and spatial coverage with observations, which, previously could only be achieved by accumulating data over many years. Here, we propose a new technique for modeling the EEJ based on principal component analysis (PCA) of a hybrid ground-satellite geomagnetic data set. The proposed PCA-based model (PCEEJ) represents the observed EEJ better than the climatological EEJM-2 model, especially when there is good local time separation among the satellites involved. The amplitudes of various solar tidal modes are determined from PCEEJ based tidal equation fitting. This allows to evaluate interannual and intraannual changes of solar tidal signatures in the EEJ. On average, the obtained time series of migrating and nonmigrating tides agree with the average climatology available from earlier work. A comparison of tidal signatures in the EEJ with tides derived from neutral atmosphere temperature observations show a remarkable correlation for nonmigrating tides such as DE3, DE2, DE4, and SW4. The results indicate that it is possible to obtain a meaningful EEJ spectrum related to solar tides for a relatively short time interval of 70 days.

本文言語英語
論文番号e2022JA030691
ジャーナルJournal of Geophysical Research: Space Physics
127
9
DOI
出版ステータス出版済み - 9月 2022

!!!All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 宇宙惑星科学

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