[P-EM11] Frontiers in solar physics

[PEM11-05] Feasibility Study of the Radio and Plasma Wave Detector for the Korea-Led L4 Mission

*宮下 幸長^1,2、Cho Kyung-Suk^1,2、Seough Jungjoon¹、Kim Roksoon¹、Kwak Jaeyoung^1,2、Ryu Kwangsun³、Jin Ho⁴、Kim Khan-Hyuk⁴、小嶋 浩嗣⁵、笠羽 康正⁶、栗田 怜⁵、三好 由純⁷、Vecchio Antonio⁸、Maksimovic Milan⁹ (1.Space Science Division, Korea Astronomy and Space Science Institute、2.Department of Astronomy and Space Science, Korea University of Science and Technology、3.Satellite Technology Research Center, Korea Advanced Institute of Science and Technology、4.School of Space Research, Kyung Hee University、5.京都大学生存圏研究所、6.東北大学惑星プラズマ・大気研究センター、7.名古屋大学宇宙地球環境研究所、8.Radboud Radio Lab, Radboud University、9.Laboratoire d'Instrumentation et de Recherche en Astrophysique, Observatoire de Paris)

キーワード：Korea-led L4 mission、Sun-Earth Lagrange point L4、radio and plasma wave detector、solar radio burst、coronal mass ejection、solar energetic particles

The Sun-Earth Lagrange point L4 is a unique location where the information of the solar activity behind the western solar limb and the heliospheric environment connected to there can be obtained continuously with remote-sensing and in situ instruments. The observations at the L4 point are helpful for monitoring and forecasting space weather and understanding the Sun-Earth and Sun-Moon connections for safe human exploration of Moon and Mars. Currently, Korea Astronomy and Space Science Institute (KASI) and the Korean space science community are conducting feasibility study of a spacecraft mission for comprehensive remote and in situ observations at the L4 point and are preparing to propose the mission whose spacecraft is targeted to launch in 2035. The L4 mission is expected to contribute significantly to improving the capability of space weather forecasting by enhancing our understanding of the heliosphere through multipoint observations from existing and planned L1 and L5 missions. In this presentation, we will outline one of the in situ instruments onboard the L4 spacecraft: the Radio and Plasma Wave detector (RPW). We plan to measure three electric field components of radio and plasma waves in a broad frequency range from almost DC to 16 MHz, which covers characteristic frequencies in the interplanetary medium. The measurements will determine the characteristics of electromagnetic and electrostatic waves at the L4 point by combining in situ magnetic field and particle measurements and remote solar imaging observations for understanding the heliospheric environment and physics. In particular, we will take advantage of multipoint observations at L4, L1, etc. to understand large-scale structure and track the sources of CME-driven type II and flare-driven type III radio bursts by the triangulation technique. Furthermore, electric antennas can indirectly measure the mass and flux of interplanetary and interstellar dust particles, so we will understand the origin and evolution of our solar system and life by combining the dust detector onboard the L4 spacecraft.