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UARS WEEKLY STATUS REPORT - 11 July 2003
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SOLSTICE
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During this week, SOLSTICE continued to operate in good health gathering
solar data on all available orbital tracking periods.
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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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The PEM web site has moved. It has a new URL. Access the PEM web site
using http://wwwpem.space.swri.edu. The PEM data from the GUVI conjunction
periods has moved to http://wwwpem.space.swri.edu/guvi-pem.html.
Level 2 PEM HEPSA data files are being reprocessed for submission to the
DAAC. This data has been designated as version 2; however, there is no format
difference from the version 1 data format. Version 2 HEPSA data is being
generated because it was discovered that there exists processing errors within
some of the HEPSA version 1 data files. Thus, if you are using any HEPSA
version 1 data files from the DAAC, please replace them with the version 2
data files. Currently, HEPSA data between 1991274 and 2002079 has been
reprocessed and archived at the GSFC DAAC. HEPSA data files for 2002080
through 2002089 are awaiting archiving at the GSFC DAAC.
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 from the first conjunction period show spatial
regions that both GUVI and PEM sampled when aurora was present. Separation
is several minutes to 10's of minutes when both instruments saw aurora.
PEM has seen no aurora during the second conjunction period. Due to a
spacecraft anomaly, no PEM data was collected during the third conjunction
period.
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 in support of the Science Traceability
Mission of UARS.
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 28 June 2003 (Orbit 64518, GMT Day 179) through 04
July 2003 (Orbit 64622, GMT Day 185).
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
HALOE 179/2152 64542 POWER OFF
WINDII 180/1459 64542 POWER ON
PEM 181/2326 64562 POWER OFF AXIS 1 & 2
WINDII 184/0359 64595 POWER OFF S/C LOW POWER
The beta angle ranged between the angles of 60.9 degrees to 77.4
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 80 degrees on 06 July 2003 (DOY 187).
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 1.26 to 1.57 degrees C. Additional
battery performance data for each battery on 27 June and 04 July 2003
are provided in Appendix D.
The clock error ranged from -10.5 to 13.9 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.
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 = 04
HALOE = 01
WINDII = 02
PEM = 01
HRDI = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 04
Three (3) Anomaly Reports 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 WINDII instrument was turned off due to a low power situation
onboard on 03 July 2003. The end-of-night load bus voltage dropped
down to 23.5, which prompted the shutdown of WINDII. UARS is now
flying through its high beta period where the available power margin
is hard to determine. Once UARS is out of the peak beta period, which
occurs early next week, there should be enough power to turn WINDII
back on.
MEETINGS
The FOT attended the UARS monthly status review to discuss the current
status of the spacecraft and events for the month of June.
The FOT attended the weekly UARS DRB on 01 July 2003, to close the DRs
provided in the new delivery of the Eclipse software and discuss
future plans.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 26 July 2003 (DOY 207). 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 04 July 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
64522 179/0630 03-158 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
64531 179/2152 03-159 HALOE POWER OFF
64542 180/1459 03-161 WINDII POWER ON
64552 181/0726 03-162 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
64562 181/2326 03-163 PEM POWER OFF AXIS 1 & 2
64580 183/0401 03-164 OBC/CLK CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
64595 184/0359 03-165 WINDII POWER OFF S/C LOW POWER
64602 184/1446 03-166 HRDI SAFEHOLD CMDS
64607 184/2317 03-167 OBC/CLK CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 04 July 2003
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 04 July 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
64522 179/0630 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
64552 181/0726 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
64580 183/0404 CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
64607 184/2317 CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 04 July 2003
27 June 2003 - GMT Day 178 Beta = 52.3 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 -700.0/-700.0 -3.68/-4.94 +00.0/-00.0 07.2 0.000 0.0
2 +00.0/-89.6 +4.50/+3.23 +24.0/-14.0 25.6 1.020 19.1
3 +22.4/-22.4 +3.55/+2.28 +23.2/-13.6 25.6 1.020 18.8
27 June 2003 - GMT Day 178 Beta = 52.3 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 -700.0/-700.0 -2.11/-3.05 +00.0/-00.0 07.2 0.000 0.0
2 +05.6/-50.4 +2.92/+1.34 +12.8/-13.6 26.2 1.030 10.4
3 +22.4/-05.6 +1.97/+0.71 +12.8/-13.6 26.2 1.020 10.3
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 04 July 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-030 FOT 64519 179/0254 33093 Tlm dropout 2:28
03-031 FOT 64592 183/2240 30832 Generic Late Acquisition
03-032 FOT 64596 184/0436 30824 Fwd Link Failover 2:27
03-031 FOT 64598 184/0857 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-027 FOT See List June 03 30832 Generic Late Acquisition
ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-030 FOT 64519 179/0254 33093 Tlm dropout 2:28
03-031 FOT See List July 03 30832 Generic Late Acquisition
03-032 FOT 64596 184/0436 30824 Fwd Link Failover 2:27