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UARS WEEKLY STATUS REPORT - 24 JUN 2005
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SOLSTICE
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Nothing received.
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SUSIM
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During this past week, SUSIM has successfully gathered its daily mid
(1.1 nm) resolution, MgII, and continuous monitoring scans for time
periods with UARS telemetry or tape recording. An offset dwell and
high (0.15nm) resolution scan were also performed.
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PEM
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HEPSA data files are version 2. Currently, HEPSA data between 1991274
and 2004273 has been reprocessed and archived at the GSFC DAAC. HEPSA data
between 2004274 and 2005049 has been processed and is waiting for archival
at the DAAC. HEPSA data for 2005050 to 2005059 is currently being processed.
MEPS data files are version 1. Processed MEPS data files at the DAAC
archive are between 1991274 and 2004259. MEPS data between 2004260 and
2005049 has been processed and is waiting for DAAC archival. MEPS data for
2005050 to 2005059 is currently being processed.
PEM continues to receive NMC data files from NOAA. No problems have
been encountered since updates have occurred.
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.
PEM has received a request for data from the super storm of November
2004. The Dst value showed sudden commencement early on November 7, 2004
reaching a Dst value of about -380 gamma early on November 8, 2004.
PEM was not active at that time and became active late on November 8, 2004
in day only mode. A second peak of about -280 gamma was observed on November
11, 2004. PEM became active in day-light only mode late on November 8. PEM
survey spectrograms for November 8-18 of 2004 may be found at:
http://climatology.space.swri.edu/UARS_images_fromRudy.html
*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 11 June 2005 (Orbit 75256, GMT Day 162) through
17 June 2005 (Orbit 75361, GMT Day 168).
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 163/2110 75285 POWER OFF
PEM 166/1330 75325 POWER ON
The beta angle ranged between the angles of 50.6 degrees to 75.1
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 80 degrees on 19 June 2005 (DOY 170).
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 3.14 degrees C. Additional
battery performance data for each battery on 10 June 2005 and 17 June
2005 are provided in Appendix D.
The clock error ranged from 10.6 to -06.7 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 = 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
HALOE = 01
PEM = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 02
One (1) Anomaly Report 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
This week the FOT continued to closely monitor the status of the
batteries. The batteries maintained their VT-5 charge level
throughout the week, until 16 June 2005 on the 2102 event. At that
time the VT level was dropped down to VT-4 in order to stop the
increasing charge to discharge ratios. The batteries were still able
to support SUSIM and SOLSTICE fulltime at this lower charge rate.
The UARS OBC clock rollover effort continued this week with several
updates to the uplink procedure being made. Simulations were run and
the procedure is very near complete. More testing will be done next
week with dummy ATC loads. Also, the ground system transition plan is
being worked to handle updating the ground system with the new epoch
year.
MEETINGS
The FOT attended the UARS Monthly Status meeting to report the
significant events for the month of May. Of note was the current
trend of the improved battery performance. They are still not
operating as they were prior to the high differential issues with
battery 3, but this month the batteries were able to support the SUSIM
turn on, which had not been achieved the previous two beta cycles.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 10 July 2005 (DOY 191). 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 17 June 2005
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
752 16/ 05-188 HALOE POWER OFF (HIGH BETA)
752 16/ 05-189 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
753 16/ 05-190 PEM POWER ON
753 16/ 05-191 MPS VT LVL 4
753 16/ 05-192 OBC/CLK CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 17 June 2005
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 17 June 2005
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
75293 164/1015 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
75347 167/2343 CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 17 June 2005
10 June 2005 - GMT Day 161 Beta = 46.3 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 00.0/ -22.4 -3.68/-4.94 +00.0/+00.0 05.8 0.00 0.0
2 -05.6/-179.2 +8.73/+7.09 +30.4/-21.6 25.4 1.04 23.8
3 00.0/-700.0 +2.60/+1.66 +16.8/-11.6 25.4 1.05 12.3
17 June 2005 - GMT Day 168 Beta = 75.1 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 00.0/ -22.4 -3.05/-4.62 +00.0/+00.0 05.8 0.00 0.0
2 00.0/ -89.6 +3.87/+3.23 +18.4/-20.0 27.0 1.05 15.4
3 00.0/-700.0 +1.34/+0.09 +09.6/-08.8 26.9 1.08 06.9
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
75345 167/2102 LV5 -> LV4
APPENDIX E
UARS ANOMALY REPORTS
Week ending 17 June 2005
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
05-030 FOT 75333 167/0240 30832 Generic Late Acquisition
05-030 FOT 75345 167/2102 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
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
------ ------ ----- ---- --- -----------------
05-030 FOT See List June 05 30832 Generic Late Acquisition