Topic:  GOES-18 Emergency Software Build PR.12.08.01 Implementation

Date/Time Issued: November 3, 2023 2125 UTC

Product(s) or Data Impacted: GOES-18 EXIS EUVS-A and XRS-A products

Date/Time of Initial Impact: November 3, 2023 2007 UTC

Date/Time of Expected End: N/A

Length of Outage: N/A

Details/Specifics of Change: On November 3, 2023 at 2007 UTC, the PR.12.08.01 emergency patch was made operational for GOES-18 EXIS product generation. This update consisted of new Look-Up Tables (LUTs) for the EXIS algorithms that aim to address two data issues that appeared in recent weeks.

A correction to the scaling of EUVS-A channel irradiances will apply the appropriate degradation correction to three channels that were found to be too low. The impacted wavelengths are the 25.6 nm, 28.4 nm, and 30.4 nm channels.

In addition, the XRS-A channel required a decrease in the dark count correction used. Around October 13, 2023, the GOES-18 XRS-A signal dropped to flatline levels during periods of low solar flux due to an overly high correction. This adjustment results in a slight increase in the XRS-A channel irradiances.

Contact Information for Further Information: Please email Steve Superczynski at stephen.superczynski@noaa.gov; ESPC Operations at ESPCOperations@noaa.gov or 301-817-3880  24x7

Web Site(s) for applicable information: N/A

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