Statistical Study of Electron Density Enhancements in the Ionospheric <i>F</i> Region Associated With Pulsating Auroras

DOI DOI Web Site Web Site Web Site 被引用文献1件 参考文献41件
  • M. Fukizawa
    Graduate School of Science Tohoku University Sendai Japan
  • T. Sakanoi
    Graduate School of Science Tohoku University Sendai Japan
  • Y. Ogawa
    National Institute of Polar Research Tachikawa Japan
  • T. T. Tsuda
    Graduate School of Informatics and Engineering University of Electro‐Communications Chofu Japan
  • K. Hosokawa
    Graduate School of Informatics and Engineering University of Electro‐Communications Chofu Japan

この論文をさがす

説明

<jats:title>Abstract</jats:title><jats:p>Pulsating auroras (PsAs) are considered to be caused by energetic (>a few keV) electron precipitation. Additionally, soft electron precipitation (<a few keV) has often been observed in PsAs. This soft electron precipitation enhances the electron density in the ionospheric <jats:italic>F</jats:italic> region. However, to date, the relationship between PsAs and soft electron precipitation has not been well understood. In this study, using the data taken by the European incoherent scatter radar and the auroral all‐sky imager at Tromsø, we conducted two case studies to investigate, in detail, the relationship between the electron density height profile and the type of aurora. Additionally, we conducted statistical studies for 14 events to elucidate how often <jats:italic>F</jats:italic> region electron density enhancement occurs with a PsA. We consequently found that 76% of electron density height profiles showed a local peak in the <jats:italic>F</jats:italic> region, with electron temperature enhancements. It was also found that 89% of the <jats:italic>F</jats:italic> region peak altitudes were above the peak altitude of the ionization rate produced by electrons of characteristic energy below 100 eV. The occurrence rate of these profiles in the hourly magnetic local time (MLT) exceeded 80% in the 22–3 MLT sectors. We suggest that the electron density enhancement in the <jats:italic>F</jats:italic> region would have been caused by electrostatic electron cyclotron harmonic waves in the magnetosphere. Another candidate would have been polar patches that had traveled from the dayside ionosphere.</jats:p>

収録刊行物

被引用文献 (1)*注記

もっと見る

参考文献 (41)*注記

もっと見る

関連プロジェクト

もっと見る

問題の指摘

ページトップへ