  We report spatial fluctuation analysis of the sky brightness in near-infrared
from observations toward the north ecliptic pole (NEP) by the AKARI at 2.4 and
3.2 micron. As a follow up study of our previous work on the Monitor field of
AKARI, we used NEP deep survey data, which covered a circular area of about 0.4
square degrees, in order to extend fluctuation analysis at angular scales up to
1000". We found residual fluctuation over the estimated shot noise at larger
angles than the angular scale of the Monitor field. The excess fluctuation of
the NEP deep field smoothly connects with that of the Monitor field at angular
scales with a few hundreds arcseconds and extends without any significant
variation to larger angular scales up to 1000". By comparing excess
fluctuations at two wavelengths, we confirm a blue spectrum feature similar to
the result of the Monitor field. We find that the result of this study is
consistent with Spitzer Space Telescope observations at 3.6 micron. The origin
of the excess fluctuation in the near-infrared background remains to be
answered, but we could exclude zodiacal light, diffuse Galactic light, and
unresolved faint galaxies at low-redshift based on the comparison with mid- and
far-infrared brightness, ground based near-infrared images.
