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  • DESCRIPTION:
     of the SEPS instrument

  • RESULTS:  
    Measurements, Data and Results from the SEPS instrument  

  • PUBLICATIONS:
    CEPPAD / SEPS Publications

  • DATA:
    SEPS Archive Database

  • CONTACTS: 
    P    eople to contact about the SEPS instrument

  • CCR:  
    Polar CEPPAD Experiment and CCR team

  • LINKS:  
    to other POLAR mission Web pages

        

      

 

SEPS
The Source/Loss-Cone Energetic Particle Spectrometer 
 aboard the POLAR Satellite

DESCRIPTION 

          The SEPS instrument is located on the POLAR satellite despun platform along with the auroral imagers, and is independent of the other CEPPAD sensors. SEPS consists of two independent telescopes which measure both the energetic electron, and ion fluxes in the vicinity of the magnetic field-aligned loss, and source cone regions with high sensitivity, and with fine angular and time resolution. 

Parameters
  Electron telescope Ion telescope
Energy range (keV) 100 to 300 100 to > 1000
Energy resolution (FWHM keV) 30 30
Number of energy channels (log/linear) 16 16
Field of view (deg) 48 x 24 20 x 20
XY image matrix (pixels) 256 128
Detector area (cm2) 12.5 6
Proton Window (kev) 100 ~ 10
Geometric factor (cm2 - sr) 0.02 to 0.0002 0.001
Total number of pixels 512 256
 

     SEPS consists of two independent telescopes, one for electrons, and one for ions. The electron telescope (schematic view)    (actual view) has twice the sensor area of the ion telescope, and uses aperture wheels to vary its dynamic range. Particle angular imaging is obtained using pinhole-camera apertures in front of the electron XY position sensitive detectors. The ion telescope is similar to the electron telescope except for the reduced sensor area, and the fact that the aperture wheels are replaced by magnets which sweep out electron.

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