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UARS WEEKLY STATUS REPORT - 19 DEC 2003
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SOLSTICE
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SOLSTICE ended four days of daylight only operations on Sunday and
continues to operate in good health gathering solar data on all
available orbital tracking periods. On average, we received 48% of each
day's data amounting to about 370 minutes of solar observing time per
day.
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SUSIM
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SUSIM successfully gathered all of its daily mid (1.1 nm)
resolution, high resolution monitoring, and occulation scans
during this past week for periods of UARS telemetry or onboard
tape recording.
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PEM
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Level 2 PEM HEPSA data files are being reprocessed for submission to the
DAAC. This data has been designated as version 2; however, there is no format
difference from the version 1 data format. Version 2 HEPSA data is being
generated because it was discovered that there exists processing errors within
some of the HEPSA version 1 data files. Thus, if you are using any HEPSA
version 1 data files from the DAAC, please replace them with the version 2
data files. Currently, HEPSA data between 1991274 and 2002365 has been
reprocessed and archived at the GSFC DAAC. Processed HEPSA data files waiting
to be archived at the DAAC are between 2003001 and 2003029.
Level 2 PEM MEPS data file documentation is complete and submitted to
the DAAC. MEPS data files are version 1. Processed MEPS data files at the
DAAC archive are between 1991274 and 1991365. Processed MEPS data files waiting
to be archived at the DAAC are between 1992001 and 1992029.
PEM continues to receive NMC data files from NOAA. No problems have
been encountered. NOAA has changed the binary structure of the NMC data and
PEM is now receiving two data streams, one in the original VAX format and the
other from their new binary format.
The PEM data from the GUVI conjunction periods may be found at
http://wwwpem.space.swri.edu/guvi-pem.html.
*Beginning of power orbit day (PEM activation): array current >5 amps, array
voltage >53.5 volts, and battery current >2.0 amps.
End of power orbit day (PEM deactivation): time in power orbit day >4 minutes,
array current <9 amps, and battery currents <0.2 amps.
Power orbit day variation: ~39-40 min at yaw to ~50-51 min at maximum beta.
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HALOE
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Nothing received.
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MLS
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Nothing received.
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HRDI
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Nothing received.
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WINDII
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Nothing received.
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MPG
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The MPG attended the 3TDRSS Status meeting held on 16 December
2003.
The MPG continues to serve as the point-of-contact for UARS
instrument operations in support of the Science Traceability
Mission of UARS.
Daily processing of instrument Daily Activity Plans continues
with no problems.
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CDHF
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Nothing received.
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FOT
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REPORTING PERIOD
This report covers 06 December 2003 (Orbit 66939, GMT Day 340) through
12 December 2003 (Orbit 67043, GMT Day 346).
SPACECRAFT OPERATION
The observatory is now in Reverse Flight (Northern Hemisphere viewing)
and is performing nominally under two-battery operations. The
instrument operational changes were:
INSTRUMENT OPERATIONAL CHANGES
Instrument Time Orbit Comment
HALOE 341/2325 66968 POWER OFF
PEM 343/2214 66998 POWER OFF
SOLSTICE 343/2319 66998 FULL TIME TO DAY ONLY
SUSIM 343/2319 66998 POWER OFF
A Forward-to-Reverse Yaw Around maneuver (number 125) was successfully
executed in Orbit 67025 beginning 345/17:35:31Z and completing at
345/18:12:41Z on 11 December 2003. All instruments were in their off
or standby mode (except for SOLSTICE in day-only). Due to the SA
position at 269 degrees, the effective night length of the spacecraft
after the maneuver was approximately 57.62 minutes. Post maneuver
analysis of data indicate that during the Yaw Around, the end-of-night
load bus voltage was 26.08 volts and the average depths of discharge
(DODs) on Batteries 2 and 3 were approximately 20.62 and 20.16 percent
respectively. The next (reverse-to-forward) YAW is scheduled for 20
January 2004 (DOY 020).
The beta angle ranged between the angles of 18.9 degrees to 06.1
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 80 degrees on 01 January 2004 (DOY 001).
Spacecraft battery 1, 2, and 3 performance monitoring continues.
Battery 1 remains OFF the charge relay. Battery 2 and Battery 3 are
currently maintaining greater than 23.6 V end-of-night (EON) load bus
voltage. Battery temperatures are stable with a temperature delta
between Battery 2 and Battery 3 of 0.96 to 1.27 degrees C. Additional
battery performance data for each battery on 05 December and 12
December 2003 are provided in Appendix D.
The clock error ranged from -10.5 to 10.2 msec during this report
period. Clock rate adjustments are listed in Appendix C.
All instrument and subsystem engineers were advised on the initial
excursion of ALERTS or Out-Of-Limits conditions detected by the FOT
for this report. A summary is listed below and the details of ALERT
and Out-Of-Limits occurrences are listed in Appendix B.
OUT-OF-LIMITS = 00
ALERTS = 00
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
FOT = 10
SUSIM = 01
SOLSTICE = 01
PEM = 01
HALOE = 01
HRDI = 00
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 01
Two (2) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
One (1) operational support problem occurred this period. Anomaly
Reports are included in Appendix E.
The data loss calculations are no longer being supplied by Data
Capture Facility (DCF).
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The FOT ran two UARS DSN tests with the spacecraft on 09 and 12
December 2003. On the first test no data blocks were received due to
an incorrect transmitter on command (TDRS versus DSN). On the second
event blocks were received at the POCC but were in the incorrect
format due to a desktop configuration issue at JPL. These desktops
have been reevaluated and will be changed to model the three possible
support configurations needed for UARS DSN events. Once these changes
have been made, JPL will schedule another test time as soon as time is
available.
The FOT also ran a few iterations of a day-in-the-life (DITL) test
with the 3 TDRS patch installed on the simulator. Unfortunately,
large attitude errors were seen during each run due to some power
modeling problems with the simulator. These problems will be
corrected next week and the DITL will be rerun.
MEETINGS
The FOT also held a 3 TDRS Status Meeting on 09 December 2003 to
review the activities remaining and future plans.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 20 January 2004 (DOY 020).
This maneuver will be a Reverse to Forward Flight maneuver (Southern
Hemisphere viewing).
Attachments: Appendix A, Real-time Command Sheets
Appendix B, Out-Of-Limits & ALERT Occurrences
Appendix C, Clock & Solar Array Rate Corrections
Appendix D, UARS Battery Performance Data
Appendix E, UARS Anomaly Reports
APPENDIX A
REAL-TIME COMMAND SHEETS
Week ending 12 December 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
66943 340/0650 03-307 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
66961 341/1206 03-308 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
66968 341/2325 03-309 HALOE POWER OFF
66993 343/1522 03-313 CADH CONFIG CDH FOR DSN
66993 343/1646 03-314 CADH DSN TEST
66998 343/2214 03-310 PEM POWER OFF
66998 343/2319 03-311 SOLSTICE FULL-TIME TO DAY ONLY
66998 343/2319 03-312 SUSIM POWER OFF
66998 343/2319 03-315 CADH CONFIG FOR TDRSS ON OMNI
67009 344/1617 03-316 MACS VT-6 FOR YAW
67024 345/1654 03-316 MACS YAW MANUEVER
67025 345/1816 03-316 MACS YAW MANUEVER
67029 346/0107 03-317 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
67038 346/1527 03-318 CADH CDH CONFIG FOR DSN
67039 346/1706 03-320 CADH CDH CONFIG BACK TO TDRSS
67042 346/2142 03-321 OBC NOOP ATC CMDS
67043 346/2237 03-316 MACS VT-6 TO VT-5
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 12 December 2003
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
-------- ----- ----------- ------
-None this report period.
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
-------- ----------- ------
-None this report period.
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 12 December 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
66943 340/0659 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
66961 341/1206 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
67029 346/0107 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 12 December 2003
05 December 2003 - GMT Day 339 Beta = 22.1 deg, SA Pos = 269 deg
DIFF V (mV) TEMP (C) CURR (amp) EON V AVE C/D AVE
BAT MAX/MIN MAX/MIN MAX/MIN MIN RATIO DOD(%)
--- ------- -------- ---------- ----- ------- ------
1 -700.0/-700.0 -3.05/-4.31 +00.0/+00.0 07.2 0.000 0.0
2 +11.2/-16.8 +5.14/+4.50 +28.8/-13.6 25.0 1.030 20.3
3 +16.8/-22.4 +4.18/+3.23 +28.0/-13.6 24.8 1.020 20.3
12 December 2003 - GMT Day 346 Beta = 06.1 deg, SA Pos = 269 deg
DIFF V (mV) TEMP (C) CURR (amp) EON V AVE C/D AVE
BAT MAX/MIN MAX/MIN MAX/MIN MIN RATIO DOD(%)
--- ------- -------- ---------- ----- ------- ------
1 -700.0/-700.0 -3.05/-4.31 +00.0/+00.0 07.2 0.000 0.0
2 +11.2/-33.6 +5.46/+4.50 +28.4/-13.2 26.4 1.020 19.9
3 +16.8/-44.8 +4.50/+3.23 +27.2/-12.8 26.4 1.020 19.2
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
67009 344/1617 LV5 -> LV6
67043 346/2237 LV6 -> LV5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 12 December 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-056 FOT 66992 343/1259 34488 Data Drops
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-056 FOT 66992 343/1259 34488 Data Drops
03-055 FOT See List Dec 03 30832 Generic Late Acquisition