THE SEM instrument flying on SoHO is periodically calibrated by Sounding rocket underflights of a similar Instrument. That instrument is then calibrated at the SURF facility of NIST. This Page describes the calibrations and results and experiments derived from these measurements.

NIST Calibration data 1999

Experiments:

  1. As Flown Calibration
  2. Grating Flip results
  3. Channel 2 (0 order) detector Calibration
  4. Beam geometry measurements
  5. Detector area determination
  6. "Tail" investigation
  7. Alignment Sensitivity
  8. Filter Model Comparisons
  9. Scan vs Sparse wavelength procedures
  10. Reproducability
  11. Alignment control and determination
  12. How good IS the alignment?
  13. Polarization Consistency
  14. Model Comparisons
  15. Improvements for next Calibration