Ionospheric Signatures of Secondary Waves From Quasi-6-Day Wave and Tide Interactions

Y. Yamazaki, Y. Miyoshi

研究成果: ジャーナルへの寄稿学術誌査読

2 被引用数 (Scopus)

抄録

A sudden stratospheric waring occurred in the southern hemisphere during September 2019, accompanied by an exceptionally strong quasi-6-day wave (Q6DW). We examine the ionospheric response using global total electron content (TEC) maps, with a focus on the short-period variability (5–48 h). A Fourier analysis of the TEC data reveals ionospheric variations associated with the secondary waves due to the non-linear interaction between the Q6DW and atmospheric tides. The largest signatures among them are related to the ∼29-h standing oscillation, which is attributable to the Q6DW interaction with the migrating diurnal tide, with the maximum amplitude ∼8% of the zonal mean. Also detected are the signatures associated with the westward-propagating ∼13-h oscillation with the zonal wavenumber 1 (∼4%) and westward-propagating ∼11-h oscillation with the zonal wavenumber 3 (∼3%), both of which can be attributed to the Q6DW interaction with the migrating semidiurnal tide. The signatures related to the Q6DW interaction with the migrating terdiurnal tide and some non-migrating tides are also observed. This is the first time that secondary wave signatures of the Q6DW-tidal interaction are identified in ionospheric observations with predicted zonal wavenumbers and periods. The oscillations are symmetric about the magnetic equator with amplitude peaks at ±20° magnetic latitudes, suggesting that the oscillations are generated by the modulation of the equatorial plasma fountain.

本文言語英語
論文番号e2020JA028360
ジャーナルJournal of Geophysical Research: Space Physics
126
4
DOI
出版ステータス出版済み - 4月 2021

!!!All Science Journal Classification (ASJC) codes

  • 宇宙惑星科学
  • 地球物理学

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