First observation of presunset ionospheric <i>F</i> region bottom‐type scattering layer

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  • Guozhu Li
    Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
  • Baiqi Ning
    Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
  • M. A. Abdu
    Instituto Nacional de Pesquisas Espaciais Sao Jose dos Campos Brazil
  • Weixing Wan
    Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
  • Chi Wang
    State Key Laboratory of Space Weather, National Space Science Center Chinese Academy of Sciences Beijing China
  • Guotao Yang
    State Key Laboratory of Space Weather, National Space Science Center Chinese Academy of Sciences Beijing China
  • Kangkang Liu
    Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
  • Libo Liu
    Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
  • Chunxiao Yan
    State Key Laboratory of Space Weather, National Space Science Center Chinese Academy of Sciences Beijing China

書誌事項

公開日
2017-03
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2016ja023647
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>The bottom‐type irregularity scattering layer (BSL) that can appear in the ionospheric <jats:italic>F</jats:italic> region bottomside has been observed generally after sunset, serving as a possible telltale of equatorial spread <jats:italic>F</jats:italic> (ESF). Using simultaneous multibeam radar measurements over two low‐latitude stations, Sanya (18.3°N, 109.6°E; dip latitude 13°N) and Fuke (19.3°N, 109.1°E; dip latitude 14°N) in China, we report, for the first time, a thin BSL that initially occurred at presunset (~1720 LT), much earlier than the occurrence of BSL generated from the equatorial plasma shear vortex‐driven instability. The presunset BSL was situated around 225 km altitude and continued to exist until the appearance of ESF plumes after sunset (~1930 LT). Interestingly, the Doppler velocities of the presunset BSL echoes measured by the radar and the <jats:italic>F</jats:italic> layer virtual heights obtained from the collocated Digisonde measurements over Sanya both show oscillations with a period of about 1 h, suggesting a close link between the occurrences of the BSL and of <jats:italic>F</jats:italic> region plasma density large‐scale wave structure before sunset. These observations could imply an important role of gravity waves in the generation of the presunset <jats:italic>F</jats:italic> region bottom‐type irregularities.</jats:p>

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