[P-EM15] 太陽地球系結合過程の研究基盤形成

[PEM15-P06] Japan's Activities for the EISCAT_3D Project

*小川 泰信^1,2、宮岡 宏¹、野澤 悟徳³、橋本 大志^1,2、大山 伸一郎³、西村 耕司⁴、津田 卓雄⁵、藤原 均⁶、堤 雅基^1,2、田中 良昌^1,2、西山 尚典^1,2、吹澤 瑞貴¹、三好 由純³、細川 敬祐⁵、中村 卓司^1,2、藤井 良一⁷ (1.国立極地研究所、2.総合研究大学院大学、3.名古屋大学宇宙地球環境研究所、4.京都大学生存圏研究所、5.電気通信大学、6.成蹊大学、7.情報・システム研究機構)

キーワード：非干渉散乱レーダー、宇宙天気、北極

The European Incoherent Scatter (EISCAT) Scientific Association started construction of the first stage of the EISCAT_3D radar in September 2017 under international collaboration. The EISCAT_3D radar is expected to be operational in 2023. At the first stage, a core site (Skibotn) with a transmission power of about 4-5 MW and two receive-only remote sites (Kaiseniemi and Karesuvanto) will be operated. The ground preparation for the three sites is in progress, and each radar unit has been installed at the sites in 2022-2023. The EISCAT_3D radar will be utilized for a variety of science cases, including study on energy and mass transport from the solar wind and magnetosphere to the ionosphere and atmosphere.
The National Institute of Polar Research (NIPR) had been contributing to the EISCAT_3D construction by supplying radar transmitter power amplifiers (SSPAs) in collaboration with the EISCAT scientific association and ISEE, Nagoya University. The high energy-efficient SSPAs have been used for engineering verification tests at the EISCAT Tromsoe and Kiruna sites since 2016. In February 2020, NIPR has concluded an MoU with EISCAT to supply in-kind Subarray Transmitter Units which are selected for the first stage by the EISCAT Headquarters through the international tendering process. In addition to these contributions to the EISCAT_3D construction, NIPR established the Advanced Radar Research Promotion Center in April 2022. The Center has several NIPR staff and visiting researchers who are working towards the joint usage and collaborative research of the EISCAT_3D radar.
In this paper, we report and discuss the prospects of Japan's activities for the EISCAT_3D project.