Technical Events
This page presents a quick look on recent events on the mission or instrument or products.
The last calibration made on April 9, 2015 (7 days after the restart and 1276 days from the launch ) shows that SCARAB is in very good health.
The 2 graphics here after gives us an evolution on A Prime coefficient and G1/G2 gain ratio.
 Evolution du facteur A prime |  Evolution du rapport de gain G1/G2 |
The SAPHIR and SCARAB instruments underwent a stop, probably linked to the high solar activity in March we saw the northern lights to northern France.
The instruments designs have a susceptibility to SEU (Single Event Upset) because the management of the double error in the RAM part is not perfect. So when we have solar event (but not only) we may have this issue. It only dependent on statistic to have a high energetic particle that passes through the equipment. The last time it was in April 2012 for SAPHIR and in November 2012 for SCARAB with the same signature. The orbit is favorable to limit this occurrence because we don't pass close to the pole but unfortunately we could be affected by the SAA (South Atlantic Anomaly). The issue doesn't affect the instrument except that we lost few hours of measurement. You can see on the plot here after that we have reached the normal performances in about one orbit.
22h Gap in SCARAB production
- SCARAB is turned OFF on April 1, 2015 at 07:09:26 UT (orbit 17901)
- SCARAB is turned ON and switched to NOMINAL mode on April 2, 2015 at 05:50 UT (orbit 17915)
48h Gap in SAPHIR production
- SAPHIR is turned OFF on March 17, 2015 at 10:18:49 UT (orbit 17691)
- SAPHIR is turned ON on March 19, 2015 at 10:15 UT (orbit 17719)
- SAPHIR is switched to NOMINAL mode on March 19, 2015 at 10:30:48 UT
 SAPHIR Temperature |  SAPHIR Gain |
Some issue on the SAPHIR products shown by users or expert:
You can see in the plot here after that the data are spread on the map with a nonrealistic location. Using the quality flag you can avoid these products.
Example on SAPHIR L1 products
