日本地球惑星科学連合2019年大会

講演情報

[E] ポスター発表

セッション記号 P (宇宙惑星科学) » P-EM 太陽地球系科学・宇宙電磁気学・宇宙環境

[P-EM15] 太陽地球系結合過程の研究基盤形成

2019年5月30日(木) 15:30 〜 17:00 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:山本 衛(京都大学生存圏研究所)、小川 泰信(国立極地研究所)、野澤 悟徳(名古屋大学宇宙地球環境研究所)、吉川 顕正(九州大学大学院理学研究院地球惑星科学部門)

[PEM15-P04] Observation and modeling of Na layer response to energetic particle precipitation

*津田 卓雄1滝沢 響吾1戸津 亮1川原 琢也2田中 良昌3江尻 省3西山 尚典3中村 卓司3 (1.電気通信大学、2.信州大学、3.国立極地研究所)

キーワード:Na層、高エネルギー降下粒子、昭和基地、Na化学モデル

Metallic layers, such as Na, Fe, Mg, K, and Ca layers, exist in the mesosphere and lower thermosphere (MLT). The height range of the MLT region corresponds to the ionospheric D and E regions, and in the polar region energetic particles precipitating from the magnetosphere can often penetrate into the E region and even into the D region. Therefore, the influence of energetic particles on the metallic layers is of interest regarding changes in atmospheric composition accompanied by auroral activity or geomagnetic activity.

In this study, we have performed a statistical investigation on relationship between Na density and cosmic noise absorption (CNA), which were obtained from 2000 to 2002 at Syowa Station, Antarctic (69.0ºS, 39.6ºE). From the investigation, we found the Na density decrease in accordance with the CNA increase, i.e., increase in the energetic particle precipitation. In the presentation, we will show these observational results, and discuss causality about the observed relationship based on numerical caculations using our Na chemistry model.