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-PS 惑星科学

[P-PS05] Recent advances of Venus science

2019年5月27日(月) 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:佐藤 毅彦(宇宙航空研究開発機構・宇宙科学研究本部)、堀之内 武(北海道大学地球環境科学研究院)、山本 勝(九州大学応用力学研究所)、Kevin McGouldrick(University of Colorado Boulder)

[PPS05-P12] Possibility of electric discharge in the Venusian atmosphere due to the super-rotation of clouds

*Adhithiyan Neduncheran1Ugur Guven1,2Ananyo Bhattacharya3 (1.University of Petroleum and Energy Studies, India、2.United Nations Centre for Space Science and Technology Education in Asia and the Pacific、3.Sardar Vallabhbhai National Institute of Technology,India)

キーワード:Venus , Super-rotation, lightning, electric discharge, atmosphere

Several evidences of electromagnetic bursts were measured by various landers and orbiters studying Venus atmosphere (Venera landers, Venus Express and the Pioneer Venus Orbiter). The electromagnetic bursts that are taking place in the cloud region in the form of lightning or fluorescence might be a result of momentum transfer, solar convection and charge dispersion in the clouds of Venus. While the lightning in Earth takes place mostly in the equatorial region, in case of Venus it is possible for lightning to occur in the polar regions, considering the kinetic energy transfer and the formation of dipoles in both hemispheres of Venus. The meridional and zonal flows can interact and cause the charge separation which possibly lead to electromagnetic bursts in different spectrum and in different regions in Venus. In labs, it is observed that SO2 emissions in UV region cause fluorescence which is one of the major phenomena taking place in the cloud tops. Based on the photochemical model published by Krasnopolsky 2011(doi:10.1016/j.icarus.2011.11.012) and the principle of refraction, we present the possibility of lightning/fluorescence phenomena being caused by the super-rotation of the clouds in the Venusian atmosphere.