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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

Update #3

  • 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.

Update #2

  • 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.

Update #1

  • 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

  1. 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.
  2. 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.
  3. The impact to CrIS should be only limited to CrIS Short Wave Infrared band at day time.
  4. 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.

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