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Masaru Matsuoka Kazuhisa Mitsuda 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1985,5(3):101-104
Detailed analyses of data obtained with gas scintillation proportional counter on Tenma huave been done for four low mass X-ray binaries (LMXB's); that is, Sco X-1, 4U1608-52, GX 349+2, and GX 5-1. This paper presents a new scenario concerning the spectra of LMXB's based on the observational fact from Tenma. The energy spectra of these sources can be expressed by a sum of two spectral components; that is, a hard component with a blackbody of temperature, kT ? 2 keV and soft component with a multi-color blackbody of maximum temperature kT ? 1.4 keV which is expected from the optically thick accretion disk. 相似文献
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Chikako Takahashi Makoto Suzuki Chihiro Mitsuda Satoshi Ochiai Naohiro Manago Hiroo Hayashi Yoshitaka Iwata Koji Imai Takuki Sano Masahiro Takayanagi Masato Shiotani 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2011
We estimate the capability of ozone (O3) retrieval with the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) instrument attached to the Exposed Facility of the Japanese Experiment Module (JEM) on the International Space Station (ISS). SMILES carries a 4-K mechanical refrigerator to cool superconducting devices in space. Since SMILES has high sensitivity thanks to the superconducting receiver, it is expected that SMILES has ability to retrieve O3 profiles more precisely than the previous millimeter–submillimeter limb measurements from satellites. 相似文献
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Yuichiro Ezoe Kumi Ishikawa Takaya Ohashi Noriko Y. Yamasaki Kazuhisa Mitsuda Ryuichi Fujimoto Yoshizumi Miyoshi Naoki Terada Yasunobu Uchiyama Yoshifumi Futaana 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2011
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. 相似文献
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Yuichiro Ezoe Tomoki Kimura Satoshi Kasahara Atsushi Yamazaki Kazuhisa Mitsuda Masaki Fujimoto Yoshizumi Miyoshi Graziella Branduardi-Raymont Kumi Ishikawa Ikuyuki Mitsuishi Tomohiro Ogawa Takuya Kakiuchi Takaya Ohashi 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2013
For the future Japanese exploration mission of the Jupiter’s magnetosphere (JMO: Jupiter Magnetospheric Orbiter), a unique instrument named JUXTA (Jupiter X-ray Telescope Array) is being developed. It aims at the first in-situ measurement of X-ray emission associated with Jupiter and its neighborhood. Recent observations with Earth-orbiting satellites have revealed various X-ray emission from the Jupiter system. X-ray sources include Jupiter’s aurorae, disk emission, inner radiation belts, the Galilean satellites and the Io plasma torus. X-ray imaging spectroscopy can be a new probe to reveal rotationally driven activities, particle acceleration and Jupiter–satellite binary system. JUXTA is composed of an ultra-light weight X-ray telescope based on micromachining technology and a radiation-hard semiconductor pixel detector. It covers 0.3–2 keV with the energy resolution of <100 eV at 0.6 keV. Because of proximity to Jupiter (∼30 Jovian radii at periapsis), the image resolution of <5 arcmin and the on-axis effective area of >3 cm2 at 0.6 keV allow extremely high photon statistics and high resolution observations. 相似文献
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