All Sky Camera (ASC)

The All-Sky Imager (ASI) provides intensified monochromatic maps of auroral and airglow emission for various lines of interest. Photometrically corrected images can provide horizontal context for simultaneous IS radar measurements, as well as provide indications for the energy of precipitating electrons, existence of precipitating protons, and spatial extent of metallic layers.

System Specification
Optics
  • · Fied of View : 180 degrees
  • · Angular Resolution : 0.2 deg center, 1 deg edge of field
  • · Spatial Resolution : 0.5 km at 100 km alt. (zenith)
  • · Focal length for primary image at filter : 24 mm
  • · Ultra-fast f/0.95 imaging onto CCD via propietary reimaging concenpt
  • · Filter Diameter : 3 inches
  • · Filter Wheel : 6 position, temperature stabilized
  • · Minimum Fieter bandwidth (fwhm) : 2 nm
  • · Filter Thickness : 0.25 inches
  • · Shutter
  • · Sensitivity : 10 Rayleigh (630.0nm) or depending on exposure
CCD
  • · Array : eV2 CCD47-10 scientific grade 1, Back illuminated, enhansed UV process
  • · Acive Area : 13.3 mm ×13.3 mm
  • · Format : 1024×1024 pixels
  • · Pixel Size : 13μm × 13μm
  • · Cooling : -70℃ (~-80℃), Themoeletric Peltier Cooled, forced air
  • · Readout : 2 MHz and 100 kHz dual speed (selectable)
  • · Quantum Efficiency : 97% at 557.7nm
Controller
  • · a separate rack-mount electronics
  • · Interface : RS-232 to USB adapters
  • · Wheel position control
  • · Shutter and bright-light sensor control
  • · Communicate with Omega filter wheel temperature controller

[ Optics image ]

[ Optical System ]

[ Filter wheel ]

[ PIXIS 1024B CCD Camera ]
Bandpass filter 557.7 nm 630.0 nm 572.5 nm
Wavelength 557.7 nm +0.3/-0 630.0 nm + 0.4/-0 5725.5 nm
Bandwidth 1.5 nm ± 0.3 1.8 nm ± 0.4 2.n nm
Transmission 50% 50%
Size 76.2 mm 76.2 mm 76.2 mm
Thickness 7.0 mm 7.0 mm
Clear Aperture 68 68
[ Specifications ]

Observation data: 557.7nm(left), no filter(center), 630.0nm(right)