STAR ICVS Long-Term Monitoring
An Operational Alert from OSPO ESPC
Product Outage/Anomaly: VIIRS SDR reflective solar bands (RSB), OMPS SDR and EDRs
and CrIS SWIR band at day time,
Issued: January 17, 2020 1938Z
- OMPS products have checked out as nominal.
- All NOAA-20 and S-NPP VIIRS SDR reflective solar bands (RSB), OMPS SDR and EDRs and CrIS SWIR bands are nominal
as of the reported time of Jan 17, 2020 at 22:11Z.
- On Jan 17, 2020 at 22:11Z a fix was implemented to a general science module/library that impacted processing of NOAA-20 and S-NPP VIIRS SDR reflective solar bands (RSB), OMPS SDR and EDRs and CrIS SWIR band at day time.
- All products except OMPS are back to meeting specification as of this update.
- Investigation into OMPS failures, primarily on the NDE product generation system are still being investigated.
- Another update will follow when OMPS products are returned back to nominal.
- A fix has been identified and is in the process of being deployed within the next several hours.
- Users should expect varying levels of degradation in both the SDR and EDR products until the fix is fully implemented.
- Please see updated information below.
Product(s) or Data Impacted:
VIIRS SDR reflectance/radiance products and L2+ products using RSB bands, OMPS SDR and EDRs, CrIS SWIR band at day time and L2+products.
Details/Specifics of Change
- There has been an anomaly in the VIIRS SDR reflective solar bands (RSB) calibration for both NOAA-20 and S-NPP due to an unexpected change in the solar vector since about 2020-01-16 0:00 UTC. As a result, large errors in VIIRS SDR reflectance/radiance products have been observed which affect RSB based products.
- This anomaly appears to affect the OMPS SDR as well with large errors in the Solar Zenith Angles. As a result almost all V8TOz and V8Pro EDRs have very large errors in derived ozone and other estimates (only 20% of these bad values are flagged). EDRs have also been impacted as of 2020-01-16 0:00Z. The IDPS Team is working on the problem but the OMPS Nadir EDR products should not be used until further notice.
- The impact to CrIS should be only limited to CrIS Short Wave Infrared band at day time.
- ESPC Level 2 products using VIIRS RSB bands and OMPS level 2 products are degraded. NESDIS is diligently investigating and working towards a solution. Further updates will be provided as conditions change.
Contact Information for Further Information
- ESPC Operations at ESPCOperations@noaa.gov and 301-817-3880