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UARS WEEKLY STATUS REPORT - 08 OCT 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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Nothing received.
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ACRIM
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Nothing received.
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PEM
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Nothing receieved.
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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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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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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.
13 days CLA (7.0) PROD (L1-L3) (473R-299C-16F=158L)
0 days GPI (4.05) PROD (CLAES L3B) (191R-164C-2F=25L)
21 days SUSIM (7.1) PROD (L1-L2) (56R-21C=35L)
The CDHF plans on testing HALOE V4.82 formal delivery software, and then the
WINDII delivery on the current CDHF.
Current day data created and cataloged in July 1999 has been loaded into the
DAAC Transfer Tables for HALOE, PEM, NMC, and UKMO.
UARS CDHF REHOST:
The CDHF continues to integrate the "UARS" environment on CDHFA/B.
We are installing PI software - HALOE 4.82 new delivery - for testing.
FDF was contacted to establish a process to test dataflows to the rehosted
CDHF.
CDHF pending software upgrades: none
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FOT
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REPORTING PERIOD
This report covers 25 September, 1999 (Orbit 43927, GMT Day 268) through 1
October 1999 (Orbit 44030, GMT Day 274).
SPACECRAFT OPERATION
The observatory is now in Foward Flight (Southern Hemisphere viewing) and is
performing nominally under two-battery operations. The instrument operational
changes were:
INSTRUMENT OPERATIONAL CHANGES
Instrument Time Orbit Comment
HALOE 270/2122 43969 On
The beta angle ranged between the angles of 1.2 degrees to 25.7 degrees for
this report period. The beta angle is now increasing toward a maximum angle of
50 degrees on 12 October 1999 (DOY 285).
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 24 September 1999 and 01 October 1999 are provided in Appendix D.
The clock error ranged from -9.9 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 = 05
The following real-time command sheets were executed for the listed operational
element(s) during this report period (see Appendix A).
% HALOE = 02
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
% FOT = 02
Zero (0) Anomaly Reports remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
% Transponder A: 99/242 - 2287.496953
% Transponder B: 99/243 - 2287.499030
GROUND SYSTEM OPERATION
Two (2) 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 99/273 show the observatory data loss to be 24 hours, 55
minutes, 36.724 seconds (an increase of 10.656 seconds since the last report
period). This is a 0.0354 percent data loss which equals a 99.9646 percent
data capture for the mission.
The increase of 10.656 seconds occurred over one (2) days:
7 2.080 seconds on Day 268 due to an Data hit.
7 8.576 seconds on Day 273 due to an Data hits, no overlap.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
Began preparations for the Leonid shower in November. More information about
the shower and the impact to UARS orbit is being requested from FDF. It is not
expected to change much if at all.
YEAR 2000 OPERABILITY SUPPORT
We received all of the planning aids needed for all the time periods to be
tested for Y2K. The CMS processing will be completed on Monday and testing
will be done on Tuesday and Thursday of next week. Hopefully, in those two
days we can complete everything that we need to verify mission success in the
next millennium.
MEETINGS
The FOT attended a meeting at Goddard Corporate Park regarding the UARS Y2k
status. The primary focus was to evaluate what the obsticles were to complete
Y2k certification and put the process back on schedule. All in all the meeting
was successful and testing will continue with the next product delivery from
FDF.
FUTURE SIGNIFICANT EVENTS
A meeting to discuss the UARS Safehold configuration and concerns for the MPS
and its batteries is planned for Wednesday, October 6. This meeting will be a
closed meeting with only the FOT and specialized engineering support attending.
PEM requested to have the timing in their turn on sequence tightened up in yet
another area. This is expected to be accomplished within the next few weeks.
The FOT plans on working with FDF to devise a plan to verify the integrity of
the UAV files in an effort to prevent discrepancies between the FDF 3-day High
Gain Gimbal Angles file (HGA), and the 4-week User Antenna View files (UAV). A
problem occured where TDRS view periods were incorrect following a UARS yaw
maneuver.
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 1 October 1999
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
43969 270/2122 99-328 HALOE Power ON
43972 271/0222 99-329 HALOE Power ON, COMPLETED
________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 1 October 1999
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
HRPTSPBIMON R-LO HRDI PULSE BUS MONITOR 43969
PEMBIAS00E R-HI PEM BIAS 43976
HRPTSPBIMON Y-HI HRDI PULSE BUS MONITOR 44005,6,8,14
HRPTSQBIMON Y-HI HRDI QUIET BUS MONITOR 44014
HRPTSPBIMON Y-HI HRDI PULSE BUS MONITOR 44018,20,21-3
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
No Alerts to report this report period.
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APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 1 October 1999
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
None this report period
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 1 October 1999
24 Sept 1999 - GMT Day 267 Beta = 1.2 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 -112.0/-134.4 -3.05/-4.62 +0.0/+0.0 16.5 0.000 0.0
2 +33.6/-22.4 +5.47/+4.51 +29.6/-14.4 24.3 1.014 21.6
3 +33.6/-33.6 +4.51/+3.23 +28.8/-15.2 24.3 1.016 21.1
DIFF V (mV) TEMP (C) CURR (amp) EON V AVE C/D AVE
BAT MAX/MIN MAX/MIN MAX/MIN MIN RATIO DOD(%)
--- ---------- -------- ---------- ----- ------- ------
1 -112.0/-134.4 -2.73/-3.99 +0.0/+0.0 16.5 0.000 0.0
2 +16.8/-67.2 +6.44/+5.15 +30.4/-15.2 24.5 1.023 22.3
3 +22.4/-56.0 +5.47/+3.87 +30.0/-16.0 24.3 1.024 22.1
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---- ---------
no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 1 October 1999
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-061 FOT 43970 270/2216 21402 NEGATIVE ACQ.
99-058 FOT 43998 272/1917 14170 GENERIC LATE ACQ.
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-058 FOT see list Sept 99 14170 Generic Late Acq.
99-059 FOT 43827 261/0856 N/A TAC Crashed
99-060 FOT 43833 261/1906 N/A TAC Crashed
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
------ ------ ----- ---- --- -----------------
None this report period
SEVNTFW99/40