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UARS WEEKLY STATUS REPORT - 10 DEC 1999
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SOLSTICE
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Data gaps due to the current tape recorder operations cause us to only loose
20-30% of our planned experiments. Otherwise, SOLSTICE continues to operate
normally, collecting solar data on all available orbital tracking periods and
stellar calibration observations, whenever possible.
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SUSIM
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SUSIM gathered a minimum set of daily solar scans this past week.
Because many of these occurred during telemetry outages, all of the
data was not retrieved. We would be able to schedule SUSIM's solar
scans during TDRS contacts if these were known sufficiently in
advance.
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ACRIM
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Nothing received.
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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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WINDII is scheduled for observations December 15 - 23, 1999. It
will be operated in PMC observing mode for southern high latitudes.
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MPG
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Routine processing of instrument Daily Activity Plans continues
with no problems. The MPG continues to assist the Project
Scientist with the scheduling of instrument operations.
The MPG is assisting the FOT with their analysis of the tape
recorder (NBTR B) anomaly.
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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.
17 days CLA (7.0) PROD (L1-L3) (476R-435C-21F=20L)
24 days GPI (4.05) PROD (CLAES L3B) (372R-356C-3F=13L)
42 days WIN (5.11A) PROD (L1-L3) (520R-102C-5F=413L)
DAAC DATA:
-DAAC data created in the month of September 1999 has been loaded into the
DAAC Transfer Tables for HALOE, NMC, PEM, and UKMO.
UARS CDHF REHOST:
-Reprocessing HALOE test V4.82 on the Rehost System.
-Successfully tested SUSIM V7.1 on the Rehost System.
Output files have been moved to an area for SUSIM validation.
-Planning and preparing to test SOLSTICE V4.62 on the Rehost
System.
-Migration for all data levels continued.
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FOT
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REPORTING PERIOD
This report covers 27 November, 1999 (Orbit 44870, GMT Day 331) through 03
December 1999 (Orbit 44974, GMT Day 337).
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
PEM 332/2314 44899 AXIS Off
The beta angle ranged between the angles of 50.3 degrees to 21.4 degrees for
this report period. The beta angle is now decreasing toward a minimum angle of
-2.0 degrees on 08 December 1999 (DOY 342).
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 1.0 to 1.3 degrees C. Additional battery performance data for each
battery on 26 November 1999 and 03 December 1999 are provided in Appendix D.
The clock error ranged from -13.3 to 11.9 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.
% ALERTS = 00
% OUT-OF-LIMITS = 01
The following real-time command sheets were executed for the listed operational
element(s) during this report period (see Appendix A).
% FOT = 06
% SUSIM = 01
% PEM = 01
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
% FOT = 06
One (1) Anomaly Reports remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
% Transponder A: 99/320 - 2287.496800
% Transponder B: 99/334 - 2287.499196
GROUND SYSTEM OPERATION
Six (6) operational support problems 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 99/336 show the observatory data loss to be 226 hours, 31
minutes, 08.953 seconds (an increase of 41 hours 11 minutes 22.080 seconds
since the last report period). This is a 0.3154 percent data loss which equals
a 99.6846 percent data capture for the mission.
The increase of 41 hours 11 minutes 22.080 seconds occurred over seven (7)
days:
- 06 hours 24 minutes 55.936 seconds on Day 330 due to a S/C TR problem.
- 06 hours 03 minutes 10.016 seconds on Day 331 due to a S/C TR problem.
- 05 hours 38 minutes 44.608 seconds on Day 332 due to a S/C TR problem.
- 05 hours 58 minutes 02.944 seconds on Day 333 due to a S/C TR problem.
- 05 hours 50 minutes 44.896 seconds on Day 334 due to a S/C TR problem.
- 05 hours 43 minutes 52.672 seconds on Day 335 due to a S/C TR problem.
- 05 hours 31 minutes 51.008 seconds on Day 336 due to a S/C TR problem.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The FOT implemented test 9; Power NBTR A, record, dump and process. This test
was done on Tuesday, November 30, 1999. It was powered up and left in the
standby mode for 1/2 an orbit to verify thermal stability or any other
anomalous trend. It was then spooled from beginning of tape to end of tape
twice and then placed into 8-mux record. The recorder was allowed to record in
its entirety and then played back. During the playback, White Sands reported
no lock on data and TPF reported no valid blocks as well. This test was
repeated in the 4-mux mode on Wednesday, December 1, 1999. White Sands and TPF
reported no frame synch and no valid blocks respectively.
The remaining tests are of a more critical nature and will be determined at a
later time whether or not to implement them.
YEAR 2000 OPERABILITY SUPPORT
All areas identified to or by the Flight Operations Team for Y2K testing have
been completed. There are no other areas identified at this time that have not
been Y2K certified.
MEETINGS
Wednesday, December 1, 1999 (DOY 335) - A meeting was held to discuss the
status of NBTR A. The key points are as follows:
- The need for a plan to operate NBTR B in the best possible manner to maximize
science data.
- Due to the diversity of the science missions with respect to their ideal
recording times, an order of importance should be identified. HALOE was
identified to have the highest priority with the use of the PASS 2 side of
NBTR B.
- Consider the possibility of using the recorder for special requests only.
- Can PASS 2 operations and realtime coverage be coordinated to maximize
science data coverage? This question was preliminarily answered with only a
10% increase in data capture by using the recorder.
- Other topics were discussed such as power concerns, three TDRSS usage,
anomaly investigation, releasing TPF acceptance restrictions and etc...
Thursday, December 2, 1999 (DOY 336) - The FOT attended a meeting to answer
questions regarding a new plotting system for UARS. Currently Health and
Safety telemetry processing takes hours to process just a few orbits of data.
A new system being reviewed is a Sun Workstation based system that would have a
window environment and produce plots in seconds or minutes. The FOT is
involved with providing additional samples and information to facilitate this
action.
FUTURE SIGNIFICANT EVENTS
No specific date was agreed upon for UARS Safehold configuration discussions.
Instead, the Supporting Engineers involved will be contacted every two weeks to
determine if either the Flight Operations Team or Supporting Engineers have any
new developments that should be discussed in a group. It is expected that one
more meeting will be held before Y2k as an update to UARS safehold expectations
for the new century.
UARS has tested and prepared for the Year 2000 event. Special considerations
have been made in preparation for a non nominal 1999 to 2000 transition.
The next UARS Yaw slew is scheduled for December 8, 1999. 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 03 December 1999
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
44888 332/0519 99-401 OBC Clk Adj fr 20.6 to 0.00 msec/day
44899 332/2314 99-402 PEM AXIS Power OFF
44925 334/1547 99-403 NBTR NBTR-A TEST
44928 334/2135 99-404 CDH CDH Config. CMDS
44929 334/2247 99-405 OBC Clk Adj 0.00 to 20.6 msec/day
44943 335/2139 99-405 NBTR NBTR-B Power Off
44951 336/1048 99-407 OBC Clk Adj 20.6 to 0.00 msec/day
44955 336/1553 99-408 SUSIM Exception Clear
_________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 03 December 1999
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
HRPTSPBIMON Y-HI PTS Pulse Bus Current Mon 44918-74
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
No Alerts to report this report period.
______________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 03 December 1999
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
44888 332/05:28 (28 Nov 99) from 0.00 to 20.6 msec/day
44929 334/22:55 (30 Nov 99) from 20.6 to 0.00 msec/day
44951 336/10:53 (02 Dec 99) from 0.00 to 20.6 msec/day
______________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 03 December 1999
26 Nov 1999 - GMT Day 330 Beta = 50.3 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 -56.0/-78.4 -3.68/-4.94 +0.0/+0.0 16.2 0.000 0.0
2 +84.0/+0.0 +5.47/+4.19 +28.4/-16.0 25.3 1.030 19.5
3 +22.4/-22.4 +4.51/+2.92 +27.2/-15.2 25.1 1.027 19.1
03 Dec 1999 - GMT Day 337 Beta = 21.4 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 -50.4/-72.8 -3.05/-4.62 +0.0/+0.0 16.2 0.000 0.0
2 +56.0/-5.6 +6.44/+5.15 +31.6/-15.2 24.8 1.037 20.0
3 +33.6/-33.6 +5.15/+3.87 +31.2/-16.0 24.5 1.035 19.7
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- --- ---------
no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 03 December 1999
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-081 FOT 44871 331/0302 14170 Generic Late Acquisition
99-081 FOT 44885 332/0058 14170 Generic Late Acquisition
99-081 FOT 44900 333/0100 14170 Generic Late Acquisition
99-081 FOT 44906 333/1040 14170 Generic Late Acquisition
99-087 FOT 44911 333/1804 21634 AP-8 NIU Problem
99-088 FOT 44936 335/0940 N/A TAC-4 Crashed
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-071 FOT 44398 299/1212 21512 TPF Not Receiving 512 PB
99-081 FOT November 14170 Generic Late Acquisition
99-087 FOT 44911 333/1804 21634 AP-8 NIU Problem
99-088 FOT 44936 335/0940 N/A TAC-4 Crashed
ANOMALY INVESTIGATION REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
No new reports generated
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-064 FOT 44135 10/8-9/99 N/A HRDI Cal Lamp Errors
SEVNTFW99/49