Update #1: The GPM altitude boost will begin with the first burn on November 7, 2023 at 1420 UTC. On the following day, November 8, 2023 at 1721 UTC, a secondary burn lasting approximately 10 minutes will take place to correct the eccentricity of the satellite orbit. After a settling period of about 20 minutes, the GPM orbit adjustments will be complete and the satellite will have stabilized. Based on this schedule it is expected that GMI data will return to normal by 1751 UTC on November 8, 2023
The DPR data outage will start with the orbit raising and will last approximately 2 months until early January.
Topic: Global Precipitation Measurement (GPM) Core outages due to altitude raising
Date/Time Issued: November 7, 2023 1409 UTC
Product(s) or Data Impacted: GPM Microwave Imager (GMI), and Dual-frequency Precipitation Radar (DPR) data products
Date/Time of Initial Impact: November 7, 2023 1420 UTC
Date/Time of Expected End: January 1, 2024
Length of Outage: Up to 60 days for GPM DPR data
Details/Specifics of Change: The Global Precipitation Measurement (GPM) Core Observatory satellite will undergo altitude raising during the period of November 7 - 8, 2023. The altitude will increase from the current 405 km to 435 km in order to extend mission life. The GPM Core mission includes two primary instruments, the GPM Microwave Imager (GMI) and Dual-frequency Precipitation Radar (DPR). This activity will have impacts on data products from both of these instruments.
A complete outage of the DPR near real-time radar and combined products will occur from the start of the altitude raising on November 7, 2023 until late December or early January 2024. During this near 2-month period of time, changes to the algorithm allowing for proper handling of the altitude adjustment will be made by the NASA GPM team.
GMI data will continue to be produced during the 2 days of altitude raising, however some degradation is possible due to the increasing footprint and incidence angle during the altitude adjustment. The GMI data will return to normal quality by November 9, 2023. Products that will be impacted by any degradation to the GMI data include: MIRS, Blended Hydro, GPM BUFR, AutoSnow, GMASI Daily Snow and Ice, ADT and eTRaP.
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