This is the AIRS, AMSU-A, and HSB weekly operations status report for Friday, October 27, 2023 (the end of week 1121 of the Aqua mission).
 
Instrument status:
AIRS:  The AIRS instrument remains healthy with all voltages, currents, and temperatures as expected.  
AMSU-A1:  AMSU-A1 is healthy except for channels 4, 5, 6, and 7.
AMSU-A2:  AMSU-A2, which provided channels 1 and 2 of the AMSU-A suite, suffered a non-recoverable loss of power on September 24, 2016 and is no longer operational.
HSB:  HSB has been non-operational since February 2003 due to a scanner anomaly.
 
 
Instrument activities since previous report:
 
An AIRS guard test ran on Monday, October 23.  Here is the detailed timeline (UT):
   296/22:42:00 AIRS Guard Test begins (AIRS in CHECKOUT mode)
   296/23:09:00 AIRS back in OPERATE mode
 
MODIS Lunar Calibration #223 was executed on Wednesday, October 25. Here is the detailed timeline (UT):
   298/11:07:00  AIRS put into READY mode prior to Lunar Cal
   298/11:07:10  Clear AIRS time-delayed queue (stop periodic command execution)
   298/11:07:20  Start periodic execution of focal plane temperature readout cmds
   298/11:07:30  Last DC Restore before Lunar Cal roll
   298/11:07:48  Slew begins (roll amount -13.7556 degrees)
   298/11:16:46  Slew complete
   298/11:22:16  Return slew begins
   298/11:31:14  Return slew complete
   298/11:31:30  Start periodic execution of DC Restore commands  
   298/11:32:00  AIRS back in OPERATE mode
 
 
AIRS hardware state: (any changes since previous report are in bold)
 
AIRS Quiet Bus A                                                     on    
AIRS Noisy Bus A                                                     on
AIRS Survival Bus A                                                 on
AIRS Quiet Bus B                                                     off
AIRS Noisy Bus B                                                     on
AIRS Survival Bus B                                                 on
Decontamination heater A                                   off
Decontamination heater B                                   off
Group 2 power                                                        on
Detector gain tables                                              Optimum gains loaded---Table                                                                                        
                                                                                    PM1_ISC_AIR_450_air_gnc_o190919_0
                                                                                    first loaded on October 7, 2019 and effective at approximately 23:18 UT
Radiometric calibrator heater                               on
Choke point heater                                                 enabled with a set point of 155.56 K
Scanner                                                                    uncaged; scanning using nominal profile
Cooler A                                                                   uncaged, electronics on, compressor on,
                                                                                  cold head set point 56.47 K
Cooler B                                                                   uncaged, electronics on, compressor on,
                                                                                  cold head set point 56.47 K
Focal plane detector modules                                on
Circumvention processing                                       on
AIRS software state:
    Patches:                                                               version 11 loaded
    Macros:                                                                version 17 loaded
    EDC tables:                                                          alternates #1, #2, and #4 loaded,
                                                                                     nominal EDC table active
    TMON's:                                                                active
    OpMode:                                                               "OPERATE"
    Op submode:                                                        "0"
    CalFunc bits:                                                          All zeroes
 
AMSU-A hardware state:
                                                                                      AMSU-A1:  On; scanners in full scan mode. Selected space view is #3.
                                                                                       Channel 7 has not met noise specifications since launch.
                                                                                      Channel 4 was declared non-operational in November 2007 and channel 5 became
                                                                                      too noisy to use in early 2013. Channel 6 NeDT is now greater than 1K.
Version 5 of the AIRS science software did not use
                                                                                      Channel 4 and Version 6 uses neither channel 4 nor channel 5.
                                                                                               
 
                                                                                     AMSU-A2 (Channels 1 and 2):  Off (survival mode).
                                                                                     Receiver temperature is about -10° C, Scan Motor temperature is about -4° C.
 
HSB hardware state:
                                                                                       Off (survival mode);  scanner stopped at about scan position 38
                                                                                      (about 8 degrees off nadir). TMON 51, which turns on the survival
                                                                                      heater at -15 degrees C, is enabled.  TMON 52, which turns off the
                                                                                      survival heater at 0 degrees C, is disabled.  The survival heater is
                                                                                      off. Local Oscillator temperatures have stabilized at about +15° C.
 
 
Upcoming events:
 
1) An AIRS photometric calibration test is planned for Tuesday, November 7.  The timeline for this activity will appear in next week's report.
2) A schedule for a number of special AIRS calibration tests (mentioned in previous reports) will also appear in next week's report.
 
 
Daily plots of noise levels for each AIRS channel are available on the AIRS webpage at https://airs.jpl.nasa.gov/mission/instrument-operations/.
A link there currently points to where the files are hosted at https://thunder.jpl.nasa.gov/nedt_trends/html/airs_channel_nedt_trends.html.
For each channel there are plots for the whole AIRS mission and for the last 2 months.
Going forward, weekly Ops status updates will be archived at the same webpage above,
and are hosted at https://airsteam.jpl.nasa.gov/report/latest and https://airsteam.jpl.nasa.gov/report/archive/.
 
==================================================================
William Mathews  - AIRS Instrument Operations  
NASA / Jet Propulsion Laboratory