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We present the smoothness of the mid-infrared sky from observations by theJapanese infrared astronomical satellite AKARI. AKARI monitored the northecliptic pole (NEP) during its cold phase with nine wavebands covering from 2.4to 24 micron, out of which six mid-infrared bands were used in this study. Weapplied power spectrum analysis to the images in order to search for thefluctuation of the sky brightness. Observed fluctuation is explained byfluctuation of photon noise, shot noise of faint sources, and Galactic cirrus.The fluctuations at a few arcminutes scales at short mid-infrared wavelengths(7, 9, and 11 micron) are largely caused by the diffuse Galactic light of theinterstellar dust cirrus. At long mid-infrared wavelengths (15, 18, and 24micron), photon noise is the dominant source of fluctuation over the scale fromarcseconds to a few arcminutes. The residual fluctuation amplitude at 200arcseconds after removing these contributions is at most 1.04 +/- 0.23 nW m^-2sr^-1 or 0.05% of the brightness at 24 micron and at least 0.47 +/- 0.14 nWm^-2 sr^-1 or 0.02% at 18 micron. We conclude that the upper limit of thefluctuation in the zodiacal light towards the NEP is 0.03% of the skybrightness, taking 2{\sigma} error into account.

Brightness and Fluctuation of the Mid-Infrared Sky from AKARI Observations towards the North Ecliptic Pole