Simultaneous Observations of Polar Mesosphere Winter Echoes and Cosmic Noise Absorptions in a Common Volume by the PANSY Radar (69.0°S, 39.6°E)

DOI Web Site Web Site 被引用文献6件 参考文献53件
  • T. Nishiyama
    National Institute of Polar Research Tachikawa Japan
  • K. Sato
    Department of Earth and Planetary Science The University of Tokyo Tokyo Japan
  • T. Nakamura
    National Institute of Polar Research Tachikawa Japan
  • M. Tsutsumi
    National Institute of Polar Research Tachikawa Japan
  • T. Sato
    Department of Communications and Computer Engineering Kyoto University Kyoto Japan
  • Y.‐M. Tanaka
    National Institute of Polar Research Tachikawa Japan
  • K. Nishimura
    National Institute of Polar Research Tachikawa Japan
  • Y. Tomikawa
    National Institute of Polar Research Tachikawa Japan
  • M. Kohma
    Department of Earth and Planetary Science The University of Tokyo Tokyo Japan

書誌事項

公開日
2018-06
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2017ja024717
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>This study focuses on the one‐to‐one relationship between the morphology of polar mesosphere winter echo (PMWE) and cosmic noise absorption (CNA) as determined by measurements made with a single atmospheric radar, the Program of the Antarctic Syowa mesosphere‐stratosphere‐troposphere/incoherent scatter (PANSY) radar. CNA was calculated using the noise level in radar signal data collected during May 2013, including data of a solar proton event on 23 May. Using PMWE and CNA data in a common volume, their temporal variations and relation were examined in detail. PMWE altitude was clearly anticorrelated with CNA magnitude in a statistical sense: When a large CNA exceeding 0.50 dB took place, PMWE seemed to concentrate around 65 km and disappear above 70 km. The electron density behind the PMWE was estimated by using the ionospheric model for the auroral zone for the solar proton event. PMWE occurrence roughly coincided with a high electron density in the model, except that no PMWE was observed above 70 km at 0730 UT despite the electron density being higher than 10<jats:sup>8</jats:sup> m<jats:sup>−3</jats:sup>. Additionally, the estimated radar volume reflectivity with the Schmidt number <jats:italic>S</jats:italic><jats:italic>c</jats:italic> less than or equal to 1 is qualitatively consistent with the observed PMWE. Although weak turbulent energy dissipation rate can also play a dominant role in the observed PMWE decay, a plausible mechanism was small <jats:italic>S</jats:italic><jats:italic>c</jats:italic> or reduction of <jats:italic>S</jats:italic><jats:italic>c</jats:italic> that is equal to an increase in electron diffusivity resulting from an unusually high electron density, which significantly reduced radar volume reflectivity above 70 km.</jats:p>

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