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UARS WEEKLY STATUS REPORT - 26 JUL 2002
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SOLSTICE
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This week, SOLSTICE continues to operate in good health. We gather solar
data on all available orbital tracking periods.
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SUSIM
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SUSIM has successfully performed its daily mid-resolution and MgII
solar scans during periods of predicted UARS telemetry.
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ACRIM
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Nothing received.
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PEM
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PEM continues to work with the GUVI team on the diagnosis of data from
the first conjunction period. Analysis of the two conjunction passes showed
that the aurora as detected by GUVI was at higher latitude than UARS.
GUVI images from other times during this conjunction period show spatial
regions that both GUVI and PEM sampled when aurora was present. Separation
is several minutes to 10's of minutes.
PEM data from the second GUVI-PEM conjunction is now being processed.
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.
*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 continues to serve as the point-of-contact for UARS
instrument operations to support re-engineering of the UARS
Mission Operations Concept to develop capabilities for the
Science Traceability Mission.
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 13 July 2002 (Orbit 59257, GMT Day 194) through 19
July 2002 (Orbit 59361, GMT Day 200).
SPACECRAFT OPERATION
The observatory is now in Forward Flight (Southern Hemisphere viewing)
and is performing nominally under two-battery operations. The
instrument operational changes were:
INSTRUMENT OPERATIONAL CHANGES
Instrument Time Orbit Comment
HRDI 196/1805 59298 POWER ON
WINDII 198/1302 59325 POWER ON
The beta angle ranged between the angles of 79.2 degrees to 58.1
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 02 August 2002 (DOY 214).
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 0.95 to 1.27 degrees C. Additional
battery performance data for each battery on 12 July and 19 July 2002
are provided in Appendix D.
The clock error ranged from -11.4 to 10.7 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 = 02
ALERTS = 00
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
FOT = 05
HRDI = 01
WINDII = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 04
Two (2) Anomaly Report remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
Four (4) operational support problems 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 is currently testing a patch to the Eclipse software, which
should resolve some issues with UARS event mnemonics. This in turn
should reduce the number of false alarm messages being received on the
realtime system. The Raytheon development team is also investigating
a telemetry discrepancy seen on the status buffer display last week.
MEETINGS
-None this report period
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 02 August 2002 (DOY 214).
This maneuver will be a Forward to Reverse Flight maneuver (Northern
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 19 July 2002
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
59261 194/0750 02-247 OBC/CLK CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
59292 196/0930 02-248 OBC/CLK CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
59298 196/1805 02-249 HRDI POWER ON
59325 198/1302 02-250 WINDII POWER ON
59326 198/1524 02-251 OBC/CLK CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
59343 199/1843 02-252 OBC/CLK CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
59347 199/2352 02-253 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 19 July 2002
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
-------- ----- ----------- ------
HRPTSBARTEMP R-HI HRDI Barrel Temp 59256
HRPTSBARTEMP R-HI HRDI Barrel Temp 59271-286
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
-------- ----------- ------
-None this report period.
______________________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 12 July 2002
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
59261 194/0753 CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
59292 196/0933 CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
59326 198/1530 CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
59343 199/1847 CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
59347 200/0002 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 19 July 2002
12 June 2002 - GMT Day 193 Beta = 78.1 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 -69.6/-78.4 -2.11/-2.77 +00.0/+00.0 8.5 0.000 0.0
2 +11.2/-67.2 +1.97/+1.34 +11.4/-13.5 24.8 1.029 10.7
3 +22.4/-22.4 +1.66/+0.71 +11.0/-13.5 24.6 1.020 10.6
19 June 2002 - GMT Day 200 Beta = 58.1 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 -157.0/-123.7 -3.30/-4.52 +00.0/+00.0 08.4 0.000 0.0
2 + 11.2/- 67.2 +3.87/+2.60 +20.8/-13.5 25.8 1.030 17.7
3 + 22.4/- 33.6 +2.92/+1.97 +20.3/-13.4 25.6 1.020 17.3
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period
APPENDIX E
UARS ANOMALY REPORTS
Week ending 12 July 2002
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-041 FOT 59279 195/1156 N/A TMON 01 tripped
02-039 FOT 59284 195/2029 14170 Generic Late Acquisition
02-039 FOT 59324 198/1152 30832 Generic Late Acquisition
02-039 FOT 59330 198/2204 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
ANOMALY INVESTIGATION REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-039 FOT See List July 30832 Generic Late Acquisition
02-041 FOT 59279 195/1156 N/A TMON 01 tripped