Solar system planets observed with Suzaku

Yuichiro Ezoe; Kumi Ishikawa; Takaya Ohashi; Noriko Y. Yamasaki; Kazuhisa Mitsuda; Ryuichi Fujimoto; Yoshizumi Miyoshi; Naoki Terada; Yasunobu Uchiyama; Yoshifumi Futaana

doi:10.1016/j.asr.2010.09.028

Solar system planets observed with Suzaku

Yuichiro Ezoe, Kumi Ishikawa, Takaya Ohashi, Noriko Y. Yamasaki, Kazuhisa Mitsuda, Ryuichi Fujimoto, Yoshizumi Miyoshi, Naoki Terada, Yasunobu Uchiyama, Yoshifumi Futaana

SCI - Geophysics

Research output: Contribution to journal › Review article › peer-review

4 Citations (Scopus)

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.

Original language	English
Pages (from-to)	411-418
Number of pages	8
Journal	Advances in Space Research
Volume	47
Issue number	3
DOIs	https://doi.org/10.1016/j.asr.2010.09.028
Publication status	Published - 2011 Feb 1

Keywords

Earth
Jupiter
Mars
Solar system objects
X-ray

ASJC Scopus subject areas

Aerospace Engineering
Astronomy and Astrophysics
Geophysics
Atmospheric Science
Space and Planetary Science
Earth and Planetary Sciences(all)

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Solar system planets observed with Suzaku. / Ezoe, Yuichiro; Ishikawa, Kumi; Ohashi, Takaya; Yamasaki, Noriko Y.; Mitsuda, Kazuhisa; Fujimoto, Ryuichi; Miyoshi, Yoshizumi; Terada, Naoki; Uchiyama, Yasunobu; Futaana, Yoshifumi.

In: Advances in Space Research, Vol. 47, No. 3, 01.02.2011, p. 411-418.

Research output: Contribution to journal › Review article › peer-review

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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.",

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AU - Ezoe, Yuichiro

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AU - Ohashi, Takaya

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AU - Mitsuda, Kazuhisa

AU - Fujimoto, Ryuichi

AU - Miyoshi, Yoshizumi

AU - Terada, Naoki

AU - Uchiyama, Yasunobu

AU - Futaana, Yoshifumi

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N2 - 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.

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