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Paper: Modeling of the Interplanetary Dust Cloud
Volume: 418, AKARI, a Light to Illuminate the Misty Universe
Page: 29
Authors: Hong, S. S.; Pyo, J.; Ueno, M.; Kwon, S. M.; Ishiguro, M.; Usui, F.; Ootsubo, T.; Ishihara, D.; Mukai, T.
Abstract: We have used the InfraRed Camera (IRC) on AKARI, to conduct a year long survey of the zodiacal emission (ZE) in the S9W and L18W mid-infrared bands. In survey mode, AKARI’s viewing direction was fixed, with respect to the Sun, at elongation 90°, but it covered the entire ranges of ecliptic longitude and latitude, producing all-sky ZE maps of high sensitivity and fine resolution. This review presents AKARI’s the first-cut view of the mid-infrared ZE in general. From the seasonal brightness variation of the south and north ecliptic poles, we located the symmetry plane’s ascending node accurately. Through a specially designed program of pointing observations, we directly measured, in five IRC bands, the mean volume emissivity of the IPDs near the Earth’s orbit. Most of the three-dimensional models of the IPD cloud are based on the brightness integral of single component dusts; however, we have shown in this review that the all-sky ZE maps, the mean volume emissivity of local IPDs, and the spectral energy distribution of the ZE from near- to far-infrared all indicate needs to generalize the assumption of single dust component.
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