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UARS WEEKLY STATUS REPORT - 01 SEP 2000
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SOLSTICE
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SOLSTICE is in good health, collecting solar data on all available orbital
tracking periods and stellar calibration observations whenever possible.
Our solar data is not affected by the larger than normal pointing errors
(2-4 arcminutes across a track) since they are within our calibrations.
Additionally, we continue to gather enough data to meet all the SOLSTICE
science objectives during this period of reduced tape recorder operations.
Level2 processing is halted due to bugs in the OA_SSPP_ATT service. CDHF
and CSC personnel are working on the problem.
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SUSIM
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Nothing received.
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ACRIM
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The ACRIM II experiment continues to gather data normally. There has been
no impact on data acquisition by the loss of star tracker information. Data
processing for current data is up to date and re-processing of all ACRIM II
data is proceeding on schedule. A comprehensive review of sensor
degradation/calibration for the duration of the mission is under way as
part of the re-processing activity.
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PEM
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Nothing received.
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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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Processing of instrument Daily Activity Plans continues with no
problems. We are continuing to coordinate with the Flight
Operations Team and to assist the Project Scientist in the
scheduling of instrument operations.
The Instrument Operations Schedule for the yaw period
17 September to 22 October 2000 was distributed.
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CDHF
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The CDHF processed current day data through level 3 for all active
instruments. Additionally, CDHF personnel reprocessed: (R)= Requested
(C) = Complete, (F)= Failed (L) = Days remaining to reprocess.
- No reprocessing requested this reporting period.
Data created in the month of July, 2000 will be previewed and loaded
into the Daac Transfer Tables September, 2000.
UARS CDHF REHOST:
- Currently investigating differences noted in the SUSIM output file
sizes for jobs run on the current (PROD) vs. rehost (TEST) systems.
- Continue to do differences and compare LEVEL0 ingested on the
current and rehost systems. Results all are good.
- Continue to monitor the current and rehost systems for
CORRELATIVE (UKMO) and Auxiliary (SOL) data that are ingested daily.
ISSUES:
1. Positive response from all PI End Users prior to transition.
2. PEM not Alpha compliant. PEM forwarded (or will be forwarded)
version we believe can process on Alpha.
3. Migration of DAAC and FORMS tables.
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FOT
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REPORTING PERIOD
This report covers 19 August 2000 (Orbit 48857, GMT Day 232) through 25 August
2000 (Orbit 48961, GMT Day 238).
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 232/0033 48857 Power ON
The beta angle ranged between the angles of 15.5 degrees to 39.5 degrees for
this report period. The beta angle is now increasing toward a maximum angle of
+49 degrees on 31 August 2000 (DOY 244).
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 23.8 V end-of-night (EON) load bus voltage. Battery
temperatures are stable with a temperature delta between Battery 2 and Battery
3 of 0.6 to 0.8 degrees C. Additional battery performance data for each
battery on 18 August 2000 and 25 August 2000 are provided in Appendix D.
The clock error ranged from -10.3 to 10.1 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 = 35
¥ HALOE = 02
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
¥ FOT = 01
Three (3) Anomaly Reports remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
· Transponder A: 00/153 - 2287.496961
· Transponder B: 00/213 - 2287.499288
GROUND SYSTEM OPERATION
One (1) operational support problem occurred this period. Anomaly Reports are
included in Appendix E.
The data loss calculations supplied by Data Capture Facility (DCF) from mission
start through UTC Day 00/237 show the observatory data loss to be 298 hours, 11
minutes, 23.369 seconds (an increase of 18 minutes 44.184 seconds since the
last report period). This is a 0.40 percent data loss which equals a 99.60
percent data capture for the mission.
The increase of 18 minutes 44.184 seconds occurred over four (4) days:
· 00 minutes 27.328 seconds on Day 231 due to a service interruption,
· 00 minutes 12.360 seconds on Day 232 due to a data hit,
· 01 minutes 15.792 seconds on Day 234 due to a late acquisition,
· 16 minutes 48.704 seconds on Day 236 due to data hits.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The FOT continues to operate FHST-1 for approximately one orbit each day. By
cycling the tracker on and off for such a short duration the degradation seems
to have been reduced. Scale factor calibrations are being provided on a
regular basis from FDF and are being uplinked when received. It appears that
the FOT has been able to stabilize the performance of FHST-1 for now and
continues to work on establishing another viable attitude control solution
should the tracker fail.
MEETINGS
The FOT attended a meeting to discuss FHST-1 on 21 and 23 August 2000.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for September 17, 2000 (DOY 261). This
maneuver will be a Reverse to Forward Flight maneuver (Southern Hemisphere
viewing).
Attachments: Appendix A, Real-time Commands 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 25 Aug 2000
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
48857 232/0033 00-425 HALOE Power ON (Part-1)
48859 232/0406 00-423 NBTR PLAYBACK
48860 232/0628 00-423 NBTR NOOPS D-232
48860 232/0628 00-426 HALOE Power ON (Part-2)
48863 232/1133 00-423 NBTR NOOPS D-232
48866 232/1604 00-422 FHST-1 Power ON
48867 232/1749 00-422 FHST-1 Power OFF
48868 232/1829 00-427 NBTR NOOPS D-233
48874 233/0409 00-427 NBTR PLAYBACK
48875 233/0553 00-427 NBTR NOOPS D-233
48881 233/1607 00-422 FHST-1 Power ON
48882 233/1751 00-422 FHST-1 Power OFF
48883 233/1831 00-428 NBTR NOOPS D-234
48889 234/0412 00-428 NBTR PLAYBACK
48890 234/0555 00-428 NBTR NOOPS D-234
48896 234/1610 00-422 FHST-1 Power ON
48897 234/1753 00-422 FHST-1 Power OFF
48905 235/0557 00-429 NBTR NOOPS D-235
48911 235/1506 00-422 FHST-1 Power ON
48913 235/1937 00-422 FHST-1 Power OFF
48919 236/0454 00-430 NBTR DOY 236 NBTR NOOPS
48926 236/1615 00-422 FHST-1 Power ON
48927 236/1757 00-431 NBTR NOOPS D-237
48927 236/1757 00-422 FHST-1 Power OFF
48929 236/2120 00-432 FHST-1 CALIBRATION
48932 237/0046 00-433 OBC Clk Adj fr 0.00 to 20.6 msec/day
48934 237/0501 00-431 NBTR NOOPS D-237
48941 237/1617 00-422 FHST-1 Power ON
48942 237/1758 00-422 FHST-1 Power OFF
48943 237/1942 00-434 NBTR NOOPS D-434
48949 238/0458 00-434 NBTR DOY 238 NBTR NOOPS
48953 238/1145 00-435 OBC Clk Adj fr 20.6 to 0.00 msec/day
48956 238/1619 00-422 FHST1 Power ON
48956 238/1619 00-434 NBTR NOOPS D238
48957 238/1800 00-436 NBTR NOOPS D239
48957 238/1800 00-422 FHST1 Power OFF
48958 238/1844 00-437 FHST1 SCALE FACTOR UPDATE
_______________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 25 Aug 2000
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 25 Aug 2000
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
48932 237/0050 (24 August) from 0.00 to 20.6 msec/day
48953 238/1148 (25 August) from 20.6 to 0.00 msec/day
___________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 25 Aug 2000
18 Aug 2000 - GMT Day 231 Beta = 15.5 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 +459.2/+168.0 -3.05/-4.62 +0.0/+0.0 15.2 0.000 0.0
2 +33.6/-44.8 +5.79/+3.87 +29.6/-14.4 24.3 1.040 19.6
3 +22.4/-33.6 +4.83/+2.60 +28.8/-15.2 24.3 1.037 19.2
25 Aug 2000 - GMT Day 238 Beta = 39.5 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 +728.0/+728.0 -3.05/-3.99 +0.0/+0.0 .14.4 0.000 0.0
2 +39.2/-67.2 +5.79/+4.51 +28.0/-15.2 24.5 1.030 21.4
3 +22.4/-50.4 +5.15/+3.87 +27.6/-15.6 24.5 1.030 21.3
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---------- ----------
no changes V/T 5
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_
APPENDIX E
UARS ANOMALY REPORTS
Week ending 25 Aug 2000
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-037 FOT 48898 234/1833 14170 Generic Late Acq.
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period
ANOMALY INVESTIGATION REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
00-040 FOT 48854 231/2111 22831 Data Dropout
00-037 FOT see list Aug 00 14170 Generic Late Acq.
00-032 FHST 48211 188/2242 N/A FHST 2 Anomaly
SEVNTFW00/34