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DESCRIPTION of the SEPS instrument |
| 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. |
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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.
Return to the SEPS Home Page
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