Solar system planets observed with Suzaku |
| |
| Authors: | Yuichiro Ezoe Kumi Ishikawa Takaya Ohashi Noriko Y Yamasaki Kazuhisa Mitsuda Ryuichi Fujimoto Yoshizumi Miyoshi Naoki Terada Yasunobu Uchiyama Yoshifumi Futaana |
| |
| Institution: | 1. Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan;2. The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Tyuou-ku, Sagamihara, Kanagawa 252-5210, Japan;3. Kanazawa University, Kakuma-chou, Kanazawa, Ishikawa 920-1192, Japan;4. Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan;5. Department of Geophysics, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan;6. Stanford Linear Accelerator Center, Standford University, 2575 Sand Hill Road, Menlo Park, CA 94025, USA;g Swedish Institute of Space Physics, Box 812, SE-98128 Kiruna, Sweden |
| |
| Abstract: | Recent results of solar system planets observed with the Japanese X-ray astronomy satellite Suzaku are reviewed. Thanks to the low instrumental background and good energy resolution, X-ray CCDs onboard Suzaku are one of the best probes to study diffuse X-ray emission. An overview of the Suzaku data of Jupiter and Earth is presented, along with preliminary results of Mars. Firstly, diffuse hard X-ray emission is discovered in 1–5 keV at Jovian radiation belts. Its spectrum is represented by a power-law continuum with a photon index of ∼1.4. This emission could originate from inverse-Compton scattering of solar photons by tens MeV electrons. Secondly, variable diffuse soft X-rays are serendipitously found during observations in the directions of the north ecliptic pole and galactic ridge. Good time correlations with the solar wind and emission lines found in the X-ray spectra are firm evidences of a solar wind charge exchange emission with Earth’s exosphere. Thirdly, diffuse X-ray emission from Martian exosphere via the solar wind charge exchange is investigated for the first time at solar minimum. A stringent upper limit on the density of the Martian exosphere is placed from the Suzaku data. |
| |
| Keywords: | X-ray Solar system objects Earth Jupiter Mars |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
