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UARS WEEKLY STATUS REPORT - 16 JUL 1999
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SOLSTICE
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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's operations this past week have been normal, without apparent
problems. Evaluation of the recently reprocessed V20 products before
their release to the DAAC continues.
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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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HRDI is operating normally. A paper will be presented at next week's SPIE
meeting discussing the long-term HRDI performance.
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WINDII
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Nothing received.
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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.
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CDHF
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UARS PCG received word from the LZP that the data gap for UARS DAY 2849,
30-JUN-1999 @13:21:47 - 14:02:28 is unrecoverable. Version 2, Cycle 1
is the "Best Available". All PI Software Reps have been notified.
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) (473R-106C-11F=356L)
51 days WIN (5.11) PROD (L1-L3) (1540R-945C-8F=587L)
UARS PCG will load May 1999 current day DAAC data in July 1999.
CDHF pending software upgrades: DEC AXP Fortran 6.5, DEC AXP OPEN
VMS 6.2, OpenIngres.
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FOT
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REPORTING PERIOD
This report covers 03 July 1999 (Orbit 42668, GMT Day 184) through 09 July
1999 (GMT Day 190).
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
WINDII 184/0018 42688 Off
PEM 186/2248 42712 AXIS Off
HALOE 187/2250 42727 Off
The beta angle ranged between the angles of 26.0 degrees to 5.1 degrees for
this report period. The beta angle is now decreasing toward a minimum
angle of 2.0 degrees on 10 July 1999 (DOY 191).
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 0.8 to 1.0 degrees C. Additional battery performance data
for each battery on 02 July 1999 and 09 July 1999 are provided in Appendix
D.
The clock error ranged from -9.4 to -2.1 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.
% ALERTS = 00
% OUT-OF-LIMITS = 00
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
% WINDII 01
% PEM 01
% HALOE 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
% FOT 03
One (1) Anomaly Report remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
Transponder A: 99/179 - 2287.496941
Transponder B: 99/180 - 2287.498977
GROUND SYSTEM OPERATION
Three (3) 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 99/189 show the observatory data loss to be
24 hours, 53 minutes, 59.476 seconds (an increase of 2.432 seconds since
the last report period). This is a 0.0364 percent data loss which equals a
99.9636 percent data capture for the mission.
The increase of 2.432 seconds occurred over two (2) day:
7 2.048 seconds on Day 183 due to data hits,
7 0.384 seconds on Day 188 due to a data hit.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
FOT personnel are supporting the IMOC (SCS-21) development effort. The
current work is a continuation of the SCS-21 UARS implementation effort
done last year which culminated in a level 1 demonstration.
The FOT continues to investigate the feasibility of a new PMON action to
change battery V/T curves based on loading to mitigate battery risks in sun
pointing safehold.
YEAR 2000 OPERABILITY SUPPORT
The end-to-end testing has been delayed until a new FORMATS software
release can be made to accommodate the special Y2K planning aids.
MEETINGS
The FOT attended the 1999 Leonid Meteor Storm Presentation on 08 July 1999.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw Around Maneuver (reverse-to-forward) is scheduled for 10
July 1999 (DOY 191).
PERSONNEL CHANGES
None
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 09 July 1999
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
42668 184/0018 99-235 WINDII Power OFF, EON LBV 23.6
42712 186/2248 99-236 PEM AXIS Power OFF
42727 187/2250 99-237 HALOE Power OFF
_______________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 09 July 1999
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 09 July 1999
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
None this report period
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 09 July 1999
02 July 1999 - GMT Day 183 Beta = 26.0 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 -100.8/-123.2 -3.05/-4.31 +0.0/ +0.0 16.5 0.000 0.0
2 +11.2/-72.8 +6.11/+4.51 +29.6/-16.0 23.8 1.023 21.5
3 +22.4/-56.0 +5.15/+3.87 +28.8/-15.6 23.7 1.020 21.2
09 July 1999 - GMT Day 190 Beta = 5.1 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 -100.8/-123.2 -3.05/-4.31 +0.0/+0.0 16.5 0.000 0.0
2 +33.6/-22.4 +5.47/+4.51 +30.0/-13.6 24.6 1.015 21.4
3 +50.4/-5.6 +4.51/+3.55 +29.6/-14.4 24.5 1.016 21.1
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- -------- ----------
no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 09 July 1999
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-033 FOT 42686 185/0518 14170 Generic Late Acquisition
99-033 FOT 42761 190/0450 14170 Generic Late Acquisition
99-033 FOT 42771 190/2118 14170 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-031 FOT 42629 181/1033 21028 NEG ACQ. 15:00 RECOV.
99-032 FOT 42629 181/1220 21028 NEG ACQ 00:41:04 LOST
ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------- ------ ----- ---- --- -----------------
None this report period
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-033 FOT see list July 99 14170 Generic Late Acq.
SEVNTFW99/28