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- W3101899557 abstract "We report on results of imaging and spectral studies of X-ray emission from Jupiter observed by Suzaku. In 2006 Suzaku had found diffuse X-ray emission in $1unicode{x2013}5$ keV associated with Jovian inner radiation belts. It has been suggested that the emission is caused by the inverse-Compton scattering by ultra-relativistic electrons ($ sim 50 $ MeV) in Jupiter's magnetosphere. To confirm the existence of this emission and to understand its relation to the solar activity, we conducted an additional Suzaku observation in 2014 around the maximum of the 24th solar cycle. As a result, we successfully found again the diffuse emission around Jupiter in $1unicode{x2013}5$ keV and also point-like emission in $0.4unicode{x2013}1$ keV. The luminosity of the point-like emission which was probably composed of solar X-ray scattering, charge exchange, or auroral bremsstrahlung emission increased by a factor of $ sim 5$ with respect to 2006, most likely due to an increase of the solar activity. The diffuse emission spectrum in the $1unicode{x2013}5$ keV band was well-fitted with a flat power-law function ($ Gamma = 1.4 pm 0.1 $) as in the past observation, which supported the inverse-Compton scattering hypothesis. However, its spatial distribution changed from $ sim 12 times 4 $ Jovian radius (Rj) to $ sim 20 times 7 $ Rj. The luminosity of the diffuse emission increased by a smaller factor of $ sim 3 $. This indicates that the diffuse emission is not simply responding to the solar activity, which is also known to cause little effect on the distribution of high-energy electrons around Jupiter. Further sensitive study of the spatial and spectral distributions of the diffuse hard X-ray emission is important to understand how high-energy particles are accelerated in Jupiter's magnetosphere." @default.
- W3101899557 created "2020-11-23" @default.
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- W3101899557 date "2019-07-27" @default.
- W3101899557 modified "2023-09-24" @default.
- W3101899557 title "Suzaku observation of Jupiter’s X-rays around solar maximum" @default.
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- W3101899557 doi "https://doi.org/10.1093/pasj/psz077" @default.
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