We are testing four all-sky monochromatic imagers, polar-cap auroral imager (PAI), at Syowa Station. The wavelengths of the Syowa PAI are N2+ 391.4 nm, O 557.7 nm, O 630.0 nm, N2 670.0 nm. The exposure times for the cameras of 391.4 nm and 630.0 nm are 18 sec with a cadence of 20 sec, while they are ~1 sec for 557.7 nm and 670.0 nm.

The camera system consists of CMOS sensor (ZWO ASI183MM Pro), fisheye lens (Fujinon FE185C086HA, f=2.7 mm, F/1.8), and bandpass optical filter made of Andover. The filter is equipped between the lens and sensor to minimize the optical system size. The cameras are controlled by small PCs (ESC LIVA-Q2 or LIVA-Z2, OS: Linux Ubuntu). The data are stored on a NAS (Synology) with a mode of RAID-1 (mirroring). The PCs and NAS and router are powered by an internet switch (Watchboot).

Temperature at Dome Fuji can be very low at minus 80 deg Celsius. The newly developed housing system can have delta T >100 K with 4 W heat inside.

We are testing the wind generator system working at Dome Fuji II.