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-EM11] Dynamics of Magnetosphere and Ionosphere

2019年5月29日(水) 13:45 〜 15:15 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:中溝 葵(情報通信研究機構 電磁波研究所)、尾崎 光紀(金沢大学理工研究域電子情報学系)、藤本 晶子(九州工業大学)、堀 智昭(名古屋大学宇宙地球環境研究所)

[PEM11-P21] Observations of MF/HF auroral radio emissions at three ground-based stations

*佐藤 由佳1熊本 篤志2加藤 雄人2門倉 昭3,4小川 泰信3,4新堀 淳樹5 (1.日本工業大学、2.東北大学大学院理学研究科、3.国立極地研究所、4.総合研究大学院大学、5.名古屋大学宇宙地球環境研究所)

キーワード:オーロラ、電波伝搬、波動粒子相互作用

We started ground-based observations of MF/HF auroral radio emissions about 10 years ago at two stations (The Husafell Station, Iceland, September 2005; The Kjell Henriksen Observatory, Svalbard, September 2008) and found multiple unknown properties of MF/HF auroral radio emissions, e.g. polarization features [Sato et al., 2008, 2015] and existence of a higher frequency component [Sato et al., 2012]. To make a next siginificant step for a futher understanding of MF/HF auroral radio emissions, we installed a new dedicated instrumentation at the KAIRA (Kilpisjärvi Atmospheric Imaging Receiver Array) site in Kilpisjärvi, Finland (Latitude: 60.07 N, Longitude: 20.76 E) in the summer of 2018. It is a passive receiving system designed to realize a high-resolution spectral, interferometric and polarization measurements using 4 loop antennas and a software-defined radio (SDR) receiver. This SDR receiver can implement high-speed, flexible digital signal processing of RF signals and obtain high-resolution spectra pauselessly throughout the night in a wide frequency range up to 6 MHz. One of the main research subjects of this project is radio emission spontaneously emitted from aurora. There are long-known three types of MF/HF auroral radio emissions identified at ground level: auroral hiss, medium frequency burst (MFB), and auroral roar. Investigation into the generation of these emissions not only offers a tool of great promise for remote sensing of ionospheric plasma processes and parameters but also gives the foundation for understanding various radiation mechanisms that occur in planetary magnetospheres and plasma in space. In combination with the long-term continuous observations in Iceland and Svalbard and future EISCAT_3D experiments, observation with this new instrumentation will provide a first-time opportunity to reveal spatiotemporal variations of macro and fine structures of MF/HF auroral radio emissions associated with substorm evolution. In this presentation, we show detailed specification of this new instrumentation and some initial results.