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LYRA on-board PROBA2

LYRA on-board PROBA2. in-orbit operations and achievements. M. Dominique, J.-F. Hochedez et al. PROBA2 Workshop ESTEC, 2010/06/22. Routine activities. Nominal acquisition: Unit2 Integration time = 50 ms Calibration Dark current LED signal Back-up acquisition

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LYRA on-board PROBA2

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  1. LYRA on-board PROBA2 in-orbit operations and achievements M. Dominique, J.-F. Hochedez et al. PROBA2 Workshop ESTEC, 2010/06/22

  2. Routine activities • Nominal acquisition: • Unit2 • Integration time = 50 ms • Calibration • Dark current • LED signal • Back-up acquisition • Acquisition with units1 and 3 • Flat-field analysis • Off-pointing sequence • Bake out - decontamination • Switch on of heaters (temperature reaches 50°C) Nominal Weekly Monthly Monthly Once every 6 months

  3. Nominal acquisition

  4. Flares • Lyra senses flares down to B1.5 at least • LYRA list of flares is in agreement with the one of GOES • Always visible in the two XUV-EUV channels • Some strong and impulsive flares are also visible in Lyman-alpha, which can then be used as a precursor

  5. Flares • M2.0 flare 2010/02/08 – 22h33

  6. Calibration sequence • More than one orbit needed to MSM detectors to reach stabilization. • No significant difference between the LED signal at the beginning of the mission and the current one → the degradation is affecting the filters and not the detectors UV LED Dark current VIS LED Dark current UV LED VIS LED

  7. Back-up acquisition UNIT 2 UNIT 1

  8. Back-up acquisition UNIT 2 UNIT 3

  9. Flat-field paving • Paving step : 0.3° • The Hz channel signal doesn’t fit the modeled behavior based on pre-launch flat-field measurements slight imprinted degradation ???

  10. Bake-out • AB + CD heaters on for 24h • Temperature increase of 10° No significant effect on the data Next attempt: July 01

  11. Specific campaigns • Occultations • Sun-Moon eclipses • Stray light analysis • SDO/EVE cross-calibration campaign Every orbit till March January 15 (annular from LYRA) July 11 (partial from LYRA) March 18-19 (still under analysis) May 3 (still under analysis)

  12. Ly alpha Hz Al Zr Occultations • Lyman alpha completely absorbed • Contribution of longer wavelengths Attitude change

  13. Sun-Moon eclipse • Attitude change • Occultation • Disappearance and appearance of the active region behind the lunar disk

  14. EVE aging effects are tracked by flying the same instruments on-board a rocket 1x/year LYRA cross-calibration campaign was scheduled during the first rocket flight Cross-calibration with SDO/EVE 200 220

  15. LYRA on-board PROBA2 ANNEXES

  16. Spacecraft maneuvers SAA Auroral Oval • Perturbations appearing around 75° latitude • 2-3 days after a CME, flare ... • Associated to geomagnetic perturbations • Only in Al and Zr

  17. And a fifth channel at 17.4nm... ... called SWAP!

  18. State of the data processing pipeline fits fits fits Current state In the future Telemetry packets Not distributed Not distributed LY-TMR: Raw data (in counts) LY-EDG Daily basis After each contact Lv1: Engineering data (in Hz) LY-BSDG fits Not available After each contact Lv2: Calibrated data (in W/m²) Plots + flare list available irregular systematic Other tools Higher level data products

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