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-EM09] Vertical coupling in the atmosphere and Ionosphere

2019年5月29日(水) 10:45 〜 12:15 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:Liu Huixin(九州大学理学研究院地球惑星科学専攻 九州大学宙空環境研究センター)、Chang Loren(Institute of Space Science, National Central University)、大塚 雄一(名古屋大学宇宙地球環境研究所)

[PEM09-P02] 地震前の電離圏擾乱を引き起こす電場の成因

*小山 孝一郎1,2,3 (1.国立成功プラズマ宇宙科学研究所  台湾、2.九州大学国際宇宙天気・教育センター、3.(株)アジア宇宙環境研究コンソーシアム)

キーワード:地震、電場、電離圏、擾乱

Disturbance of ionosphere before large earthquakes has been very often reported. One of the possible disturbing drivers is electric field, which explains most of the ionosphere features we reported so far. However, the origin of the electric field is still in the darkness. One idea of electric field generation exists inside earth interior (Freund et a., 2006). We propose here that the electric field is dynamo field at the height of ≈ 100 km, which simply intensified before earthquake; intensified eastward (westward)electric field during daytime(nighttime). This idea explains satellite data (Oyama et al.,2008; Oyama et al.,2011; Ryu et al., 2014; Ryu et al., 2016; Oyama et al.,2016; Oyama et al., 2019).

Next question on the electric field generation is the mechanism which modifies the dynamo field. We speculate that modification of E field is a result of modification of neutral wind system, which is originally caused by internal gravity waves which propagate from below. Then again next question is on the origin of the internal gravity waves. The waves might be originally caused by the ground motion, and these waves which propagate upward might interact with planetary wave, and amplified. We show several side evidence of ground motions before earthquakes.