System Details and Calibrations of the CRLASI Minoru

System Details and Calibrations of the CRL-ASI Minoru Kubota Communications Research Laboratory Contents • System details of the CRL-ASI • Calibration and data processing for the CRL-ASI

Instruments and Targets of the Alaska project 2000～

System details of the CRL-ASI System diagram of CRL-ASI

Size and externals

Optical system f 80 mm Bright and Precise! Fisheye Nikkor • f 6 mm • F 1. 4 • FOV 180 o • Weight: 5 kg Total transmission of fisheye lens and telecentric lens system

Detector (CCD camera) Pixel. Vision Spectra. Video Camera Model SV 512 • format: 512× 512 • Back-illuminated CCD (SITe) • O-ring Dewar • 3 -stage thermoelectric cooler (minimum temp. ~225 K) • dark current: ~0. 5 electron/pixel/sec@230 K • readout noise: ~12 electron, rms@100 k. Hz-readout Quantum efficiency of the back-illuminated CCD

Control software Functions: ² decision of observation period and sequence ² filter-channel control ² focus control ² CCD camera control (temperature setting, exposure, data readout. . ) ² data saving ² making QL-images and display ² operation from a remote-site Programming Language: Visual C++, Visual Basic, and IDL OS: Windows NT Control panel of the CRL-ASI

SALMON (System for Alaska Middle Atmosphere Observation Data Network) SALMON is developed using a high-speed computer networks, for effective use and display of the data observed in Alaska and for assistance in the data distribution. The system has capabilities of quasi-real time data transfer to CRL from Alaska, real time data displays on the world wide web.

Please add SALMON in your bookmark!! http: //salmon. crl. go. jp/

Calibration and Image Data Processing of the CRL-ASI Sensitivity calibration using an integrating sphere Aug. 1999 in NIPR, Japan

Image of the integrating sphere It shows that luminosity (sensitivity) drops towards the edge of the image. (mainly by vignetting)

Image data processing WWW ftp real-time display

Geometry of the van Rhijn effect and atmospheric extinction 100 km alt. Variation of the van Rhijn correction factor combined with atmospheric extinction versus zenith angle. [F. Kasten, Arch. Mateorol. Geophys. Bioklimatol. , p 206, 1966]

CRL-ASI Observations at Poker Flat Observatory: Poker Flat Research Range (PFRR) LAT. 65. 1 o. N、LON. 147. 5 o. W MLAT 65. 5 o Observation Periods: Oct. , 2000 ~ Apr. , 2001 Sept. , 2001 ~ Mar. , 2002 Sept. , 2002 ~ Mar. , 2003 Sept. , 2003 ~ Mar. , 2004 ~ ? : ASI field-of-view for an assumption of observation altitude of 100 km. : ASI field-of-view for 250 km altitude.

Target emissions, filter details, and exposure times for the CRL-ASI in 2000