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UARS WEEKLY STATUS REPORT - 27 JUN 2003
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SOLSTICE
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Nothing received.
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SUSIM
***********
SUSIM has successfully gathered all of its daily mid resolution,
weekly offset, and O2 occultation scans this past week during
periods of UARS telemetry or during periods of onboard tape
recording.
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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 2001365 has been
reprocessed and archived at the GSFC DAAC. HEPSA data files for 2002010
through 2002029 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 14 June 2003 (Orbit 64308, GMT Day 165) through 20
June 2003 (Orbit 64411, GMT Day 171).
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
SOLSTICE 168/1342 64361 POWER ON TO FULLTIME
SUSIM 168/1521 64362 POWER ON PART 1
PEM 169/1346 64376 POWER ON DAY ONLY
HALOE 171/1251 64405 POWER ON PART 1
A Reverse-to-Forward Yaw Around maneuver (number 120) was successfully
executed in Orbit 64317 beginning 165/16:14:06Z and completing at
165/16:51:16Z on 14 June 2003. All instruments were in their off or
standby mode (except for SOLSTICE in day-only). Due to the SA
position at 269 degrees, the effective night length of the spacecraft
after the maneuver was approximately 55.71 minutes. Post maneuver
analysis of data indicate that during the Yaw Around, the end-of-night
load bus voltage was 25.60 volts and the average depths of discharge
(DODs) on Batteries 2 and 3 were approximately 21.09 and 20.62 percent
respectively. The next (forward-to-reverse) YAW is scheduled for 26
July 2003 (DOY 207).
The beta angle ranged between the angles of -04.5 degrees to 20.6
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 1.27 to 1.92 degrees C. Additional
battery performance data for each battery on 13 June and 20 June 2003
are provided in Appendix D.
The clock error ranged from -9.6 to 10.6 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 = 03
SOLSTICE = 01
SUSIM = 01
PEM = 01
HALOE = 02
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 02
Two (2) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
Two (2) 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
Parallel operations with the new Eclipse Build 2.0.2 and the existing
Eclipse Build 1.5.0 began on 19 June 2003, and will continue into next
week. If the new Build runs error free during this time then it will
be released for operations. The tentative date for the switch over is
set for 25 June 2003.
MEETINGS
The FOT attended the weekly UARS DRB on 17 June 2003, to review the
open DRs and discuss the testing status of the new Eclipse software
delivery.
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 20 June 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
64346 167/1345 03-147 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
64346 167/1442 03-145 MPS VT LEVEL-6 TO LEVEL-5
64348 167/1703 03-145 MPS BATSOC
64361 168/1342 03-148 SOLSTICE POWER ON TO FULL TIME
64362 168/1521 03-149 SUSIM POWER ON PART 1
64364 168/1814 03-150 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
64376 169/1346 03-151 PEM POWER ON DAY ONLY
64376 169/1346 03-149 SUSIM POWER ON
64405 171/1251 03-152 HALOE POWER ON PART 1
64409 171/1810 03-153 HALOE POWER ON PART 2
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 20 June 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 20 June 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
64346 167/1349 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
64364 168/1814 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 20 June 2003
13 June 2003 - GMT Day 164 Beta = 7.9 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/-4.62 +00.0/-50.0 07.2 0.000 0.0
2 +11.2/-95.2 +5.47/+4.51 +26.4/-50.0 23.8 1.020 21.0
3 +22.4/-67.2 +4.51/+3.23 +25.6/-50.0 23.8 1.010 20.5
20 June 2003 - GMT Day 171 Beta = 20.6 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 +11.2/-39.2 +5.15/+3.23 +28.0/-14.8 24.8 1.020 18.9
3 +22.4/-44.8 +3.87/+2.60 +27.2/-14.4 24.8 1.010 18.6
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
64316 165/1502 LV5 -> LV6
64346 167/1442 LV6 -> LV5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 20 June 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-027 FOT 64337 167/0007 30832 Generic Late Acquisition
03-029 FOT 64352 167/2321 32998 Severe Weather 6:14 32K
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-029 FOT 64352 167/2321 32998 Severe Weather 6:14 32K
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
------ ------ ----- ---- --- -----------------
03-027 FOT See List June 03 30832 Generic Late Acquisition
03-029 FOT 64352 167/2321 32998 Severe Weather 6:14 32K