1. in-orbit operations and achievements
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: Nominal Calibration Weekly
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
Once every 6 months 2

3. Nominal acquisition Parameters of the mode IT 50 ms Unit(s) Unit 2 LED
Remark
IT up to 10ms have been tested

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
Dark
current
VIS LED
UV LED
Dark
current
UV LED
VIS LED

7. Back-up acquisition
UNIT 2
UNIT 1 7

8. Back-up acquisition
UNIT 2
UNIT 3 8

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 10

11. Specific campaigns Occultations Every orbit till March
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 11

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

13. Sun-Moon eclipse Attitude change Occultation
This figure shows, first, the shadow of the moon crossing the sun, and then the regular eclipse by the shadow of the earth. It
looks interesting because of the asymmetry in the short-wavelength channels 2-3 and 2-4. The reason could be the
inhomogeneous distribution of EUV and X-ray radiation across the solar surface.
Again, 30 seconds were added to LYRA time, such that the end of the little bumps in the upper right corner correspond to
the attitude change of 05:19:31 UTC.
The other eclipse around 09:00 UTC of the same day was not used here, because it was partially hidden by an earth eclipse.
Disappearance and appearance of the active region behind the lunar disk

14. Cross-calibration with SDO/EVE
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
200
220 14

15. LYRA on-board PROBA2
ANNEXES

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

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

18. State of the data processing pipeline
Current state
In the future
Telemetry packets
Not distributed
Not distributed
LY-TMR:
Raw data (in counts)
fits
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 18