Japan Geoscience Union Meeting 2016

Presentation information

International Session (Poster)

Symbol P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM03] Mesosphere-Thermosphere-Ionosphere Coupling in the Earth's Atmosphere

Sun. May 22, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University), Akinori Saito(Department of Geophysics, Graduate School of Science, Kyoto University), Loren Chang(Institute of Space Science, National Central University), Atsuki Shinbori(Research Institute for Sustainable Humanosphere (RISH), Kyoto University)

5:15 PM - 6:30 PM

[PEM03-P11] Fine structures in the E-region plasma density of the ionosphere observed by a Ca+ resonance scattering lidar observation

*Mitsumu K. Ejiri1, Takanori Nishiyama1, Takuo T. Tsuda2, Makoto Abo3, Katsuhiko Tsuno4, Satoshi Wada4, Takayo Ogawa4, Takuya Kawahara5, Takuji Nakamura1 (1.National Institute of Polar Research, 2.The University of Electro-Communications, 3.Graduate School of System Design, Tokyo Metropolitan University, 4.RIKEN, 5.Faculty of Engineering, Shinshu University)

Keywords:resonance scattering lidar, Ca+, fine structure, Sporadic E layer, interaction of neutral and plasma atmospheres

The National Institute of Polar Research (NIPR) is developing a new resonance scattering lidar with multiple wavelengths to install and operate it at Syowa, Antarctica. The lidar will observe temperature profiles and variations of minor constituents such as Fe, K, Ca+, and aurorally excited N2+ in the mesosphere and lower thermosphere. In August 2014, it received the first light from Ca+ in a sporadic E layer. After that, we increase the resolution of the Ca+ observation and have succeeded in getting the Ca+ profile with time/height resolution of 5 sec/15 m. As a result of the high resolution observations, fine structures in a sporadic E layer with a vertical width of only 1 – 2 km have become detectable clearly. In this presentation, we will show the observed fine structures and discuss atmospheric instabilities in the E-region plasma.