[P-CG21] 宇宙・惑星探査の将来計画と関連する機器開発の展望

[PCG21-10] GEO-X (GEOspace X-ray imager) : Imaging the dayside solar wind-terrestrial magnetosphere interaction

★招待講演

*Ezoe Yuichiro¹、Miyoshi Yoshizumi²、Kasahara Satoshi³、Funase Ryu³、Nagata Harunori⁴、Nakajima Hiroshi⁵、Ishikawa Kumi⁶、Yamazaki Atsushi⁶、Hasegawa Hiroshi⁶、Hiraga Junko⁷、Fujimoto Masaki⁶、Mitsuda Kazuhisa⁶、Ueno Munetaka⁸、Koizumi Hiroyuki³、Kawakatsu Yasuhiro⁶、Iwata Takahiro⁶、Sahara Hironori¹ (1.Tokyo Metropolitan University、2.Nagoya University、3.University of Tokyo、4.Hokkaido University、5.Kanto Gakuin University、6.ISAS/JAXA、7.Kansei Gakuin University、8.Kobe University)

キーワード：X-ray、Earth's magnetosphere

Understanding complex nature of the solar wind interaction with solar system objects such as the Earth’s magnetosphere, the Martian exosphere, and the Jovian magnetosphere is crucial in planetary physics, heliophysics and astrophysics including exoplanet physics. Remote sensing imaging observations provide global variation of these environments as a function of solar winds as demonstrated about aurora ovals, the terrestrial plasmasphere, and the terrestrial ring current. Such observations are complimentary to in-situ electromagnetic and particle observations. Recently soft X-ray emission (0.1-2.0 keV) generated via charge exchange process of high charge state solar wind ions (O6+, N5+, …) with geocorona is discovered. Numerical simulations predict that this emission must allow us to image dayside solar wind-terrestrial magnetospheric interaction such as the magnetosheaths, the cusps and the shock. GEO-X is a Japanese small satellite mission carrying a novel wide-field of view X-ray telescope and a high speed X-ray detector to demonstrate the X-ray imaging of the Earth’s magnetosphere. GEO-X aims observations of the dayside boundaries of the Earth’s magnetosphere in the vicinity of the Moon around the next solar maximum.