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UARS WEEKLY STATUS REPORT - 01 OCT 2004
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SOLSTICE
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SOLSTICE returned to full time operations on Monday (271) after three
and a half days of day only operations in support of the yaw maneuver.
Otherwise, the instrument continues to perform exceptionally, taking
solar data on all available orbital tracking periods. An average of 52%
of data were returned this week accounting for 366 minutes of solar
observing time per day.
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SUSIM
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SUSIM resumed operations on Monday, Sept. 27. Since then, SUSIM
successfully gathered daily mid (1.1 nm) resolution, MgII, and
continuous monitoring scans during periods of UARS telemetry.
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PEM
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HEPSA data files are version 2. Currently, HEPSA data between 1991274
and 2004119 has been reprocessed and archived at the GSFC DAAC. HEPSA Level 2
data files from 2004120 to 2004139 are processed and waiting for archiving.
MEPS data files are version 1. Processed MEPS data files at the
DAAC archive are between 1991274 and 2004119. MEPS Level 2 data files from
2004120 to 2004139 are processed and waiting for archiving.
PEM continues to receive NMC data files from NOAA. No problems have
been encountered.
The PEM data from the GUVI conjunction periods may be found at
http://wwwpem.space.swri.edu/guvi-pem.html. The additional electron data for
the October and November storms of 2003 has been moved and is now located at
http://climatology.space.swri.edu/uars_fromRudy.html. For those users of
SDDAS, update your UARS Meta data and these data times will appear
with full functionality. Proton data from these storms are now located at
http://climatology.space.swri.edu/UARS_images_from_Rudy_(Apr._2004).html
Requests have been received for storm spectral data. Overview plots were
produced and these plots may be found on the web at
http://climatology.space.swri.edu/UARS_images_postedJune2004.html
for the storms of October 29 of 1991, November 8-9 of 1991, April 6-7 of 2000,
March 31 - April 1 of 2001, April 11-12 of 2001, November 6-7 of 2001, and
November 11-12 of 2001.
*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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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 18 September 2004 (Orbit 71256, GMT Day 262)
through 24 September 2004 (Orbit 71360, GMT Day 268).
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
PEM 264/2313 71300 POWER OFF
PEM 264/2313 71300 AXIS 1 & 2 OFF
HALOE 265/2348 71315 POWER OFF
SOLSTICE 267/2306 71345 FULLTIME TO DAY ONLY
SUSIM 264/2306 71345 POWER OFF
The beta angle ranged between the angles of 23.3 degrees to 4.4
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 25 September 2004 (DOY 269).
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 0.96 to 1.27 degrees C. Additional
battery performance data for each battery on 17 September and 24
September 2004 are provided in Appendix D.
The clock error ranged from 10.3 to -11.2 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 = 06
PEM = 02
HALOE = 01
SOLSTICE = 01
SUSIM = 01
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
The new release of the CMS code continued to undergo testing this
week. This new release was built to fix the file transfer problem
encountered in the previous build. The preliminary testing showed the
file transfer issue to be resolved, but the build still requires all
other process testing. The goal for completion is the end of
September.
The FOT released the new Eclipse software build to operations on 13
September 2004. This new release took care of several DRs that had
been written against the previous release. No major issues have been
found and the software has run well since its installation.
MEETINGS
The FOT attended the HRDI attitude meeting on 22 September 2004. At
this meeting a new ground solution method was proposed to try to
provide HRDI with better attitude knowledge for their past data. This
method will be pursued in conjunction with the current simulations to
better tune the UARS Kalman filter.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 25 September 2004 (DOY 269).
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 24 September 2004
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
71264 262/1444 04-265 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
71272 263/0243 04-266 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
71290 264/0744 04-267 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
71300 264/2313 04-268 PEM POWER OFF
71300 264/2313 04-269 PEM AXIS 1 & 2 OFF
71314 265/2158 04-270 CADH NOOP XMTR ON (DELETED PASS)
71315 265/2348 04-271 HALOE POWER OFF
71345 267/2306 04-272 SOLSTICE FROM FULL TO DAY ONLY FOR YAW
71345 267/2306 04-273 SUSIM POWER OFF FOR YAW
71353 268/1138 04-274 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
71355 268/1506 04-275 MPS CMD TO VT L6 FOR YAW
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 24 September 2004
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 24 September 2004
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
71264 262/1449 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
71272 263/0253 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
71290 264/0744 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
71353 268/1143 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 24 September 2004
17 September 2004 - GMT Day 261 Beta = 31.8 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 -3.05/-4.31 +00.0/+00.0 07.0 0.00 0.0
2 -00.0/-078.4 +5.14/+3.87 +27.2/-14.4 25.4 1.03 19.5
3 -11.2/-140.0 +3.87/+2.91 +26.4/-14.4 25.4 1.03 19.2
24 September 2004 - GMT Day 268 Beta = 04.4 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 -3.36/-4.94 +00.0/+00.0 07.0 0.00 0.0
2 00.0/-50.4 +4.83/+3.87 +27.2/-12.0 25.9 1.02 19.3
3 11.2/-89.6 +3.87/+2.60 +26.8/-12.0 25.8 1.01 18.9
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
71355 268/1506 LV5 -> LV6
APPENDIX E
UARS ANOMALY REPORTS
Week ending 24 September 2004
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
04-061 FOT 71286 264/0156 36997 Data Dropout
04-062 FOT 71288 264/0418 36998 Data Dropout
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
04-060 FOT 71177 256/1904 36935 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
------ ------ ----- ---- --- -----------------
04-061 FOT 71286 264/0156 36997 Data Dropout
04-062 FOT 71288 264/0418 36998 Data Dropout