Monitoring of Tropospheric Emissions and Pollution with TEMPO Ground Segment
"Successfully completed commissioning of TEMPO providing detailed analysis of pollution monitoring operations. Commanding and scanning reports showcase operational efficiency and data quality for ongoing science missions."
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Tropospheric Emissions: Monitoring of Pollution TEMPO Ground Segment and Science Operations Raid M. Suleiman, John C. Houck, John E. Davis, and Jean A. Fitzmaurice August 26, 2024
Commissioning Summary Successfully completed Activation and Instrument Characterization and Analysis, adapting sequence of events as needed to allow for completing activities while anomalies were resolved All Plans and Procedures were available and used to carry out commissioning All systems required for commanding performed well All systems required for telemetry data monitoring performed well and as expected Science Data Processing performed well and enables meeting science data production timeline requirements TEMPO Power on June 7, 2023. First Light July 31 August 2, 2023. Commissioning Successfully Completed. Nominal Operations started October 19, 2023 2
Commanding Summary Commanding: 128499 successful commands executed by the instrument (w/o spacecraft generated IRU_BIASES commands) 20 rejected commands (all during commissioning and all caused by a spacecraft bug affecting TBL_UPLOAD commands whose size fall on a 64 byte boundary) We have had 5706 Earth scans (so far) - 5355978 radiance images (4034 hours total exposure time) 107 Irradiance images (We were taking them each night but switched to once per week last September) 54543 Dark images (80 hours exposure) 3563 Irradiance Dark images City light measurements 643 granules West & East Coast: 7 days Chicago and Houston: 4 days Full FOR coverage: 2 day Partial FOR coverage: 1 day Aurora (tilt FOR north) 3
Hourly and Optimized Scans Pl anID: 93 14:00 15:00 13:00 16:00 12:00 202 200 203 201 200 17:00 11:00 200 201 150 18:00 10:00 120 201 230 90 19:00 09:00 60 201 30 20:00 201 08:00 21:00 201 07:00 SBA [deg] 201 227 22:00 06:00 (08-25) (08-24) 230 200 SM C-X [ rad] -50000 23:00 200 05:00 -25000 200 200 00:00 25000 04:00 FSW Cmd CM A OPEN 50000 02:00 SM A M OV E CM A CLOSED 01:00 2024-08-24 UTC 03:00 Earth Scan (y = 0) CM A W ORK ING Earth Scan (y = 0) K eep-out Zone Solar Cal Work Dark Cal M aneuver W indow (Saturday) Linearity Solar BSA 4
Anomalies & Events Messages SAFE Mode September 8, 2023, due to an unscheduled maneuver by Intelsat that was not contained in the maneuver file (not related to the instrument). January 24, 2024, due to change in IS40e pointing, caused by the failure of the GPSR1 (not related to the instrument). Scan mirror stopped advancing midway through scan: 7 times (10/30/2023, 11/30/2023, 02/07/2024, 03/31/2024, 05/13/2024, 05/31/2024, 07/03/2024). UT_INVALID_TIME_CODE (26 times): This event is posted when a Time Code Update is received from the S/C, but the TCU message is invalid - it contains an invalid time value. The anomalies did not affect operations or the quality of the science, except for when the instrument was in SAFE Mode. 5
TEMPO Simulator On July 31, 2024, the TEMPO Simulator (TS) failed. Prior to sending the weekly command load to Intelsat, we were unable to validate the command blocks. The TEMPO Instrument Simulator is composed of three components: the Instrument Simulator Console (ISC), Bus Simulator Console (BSC), and the Instrument Control Electronics (ICE). BAE identified the issue with the simulator as being hardware failure of NI 1071 chassis (781368-01 PXIe-1071-NI). The replacement part was ordered on 8/21/24 and arrived at SAO on 8/22/24. We uploaded two weeks command load (previously validated CBMs) to TEMPO on Wednesday 8/21. The commanding was successful without any errors. We sent a push command to execute on 8/22/24 at 02:45 UTC (10:45 PM EDT). The Ops team watched the telemetry arrive at the Remote Monitor ~10:55 PM EDT No commands were rejected or skipped. 6
Moving forward We expect to replace the hardware the week of September 2nd and we expect the simulator to be ready for the commanding session on 9/4/24. We will upload a new command load (previously validated CBMs) to TEMPO on Wednesday 8/28. We should be able to resume city light observations on Wednesday, 9/4. However, we will do measurements similar to those previously performed. We should be able to do special observations after Wednesday, 9/11. However, we will do measurements like those previously performed. Plan ahead by validating commands that could be used to for special observations and TSO (use historical events). Ready and anticipate no future impact on operations 7
