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UARS WEEKLY STATUS REPORT - 07 OCT 2005
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SOLSTICE
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Nothing received.
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SUSIM
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Nothing received.
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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 2005099 has been processed and is waiting for archival
at the DAAC.
MEPS data files are version 1. Processed MEPS data files at the DAAC
archive are between 1991274 and 2004259. MEPS data between 2004260 and
2005099 has been processed and is waiting for DAAC archival.
HEPSB data files are version 1. HEPSB data files between 1991274 and
1991366 have been processed and are waiting for DAAC archival.
Processing of all PEM DAAC data files has been suspended until the
DAAC catches up with archiving all processed data files. It was discovered
that DAAC changed the access IP node. This caused failure accessing SwRI
to retrieve Level 2 data. A change order at SwRI has been completed.
Tests of the interface can now be conducted.
Tests of the AXIS1 data file formats have been successful. The AXIS1
format design has been coded. A test file has been generated. A check
program with processing scripts have also been generated. Example binary
read program is complete and verified. These results have been sent to
the project. Creation of the AXIS1 data documents for DAAC data will
begin shortly.
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 is participating in the on-going UARS end of mission
planning activities.
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 24 September 2005 (Orbit 76836, GMT Day 267)
through 30 September 2005 (Orbit 76948, GMT Day 273).
SPACECRAFT OPERATION
The observatory is now in Reverse Flight (Northern Hemisphere viewing)
and is performing nominally under two-battery operations. The
instrument operational changes were:
INSTRUMENT OPERATIONAL CHANGES
Instrument Time Orbit Comment
HALOE 268/1341 76860 HALOE POWER ON
HALOE 269/2216 76880 HALOE POWER OFF
The beta angle ranged between the angles of 28.1 degrees to 58.2
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 62 degrees on 278 October 2005 (DOY 279).
Spacecraft battery 1, 2, and 3 performance monitoring continues.
Battery 1 remains OFF the charge relay. TMON 45 and 46 are
maintaining the relay operations for battery 2. 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 11.9 to 11.5 degrees C.
Additional battery performance data for each battery on 23 September
2005 and 30 September 2005 are provided in Appendix D.
The clock error ranged from 09.9 to -2.0 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 = 01
HALOE = 03
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 01
Two (2) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
One (1) operational support problem 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 continues to closely monitor the condition of
battery 2 and battery 3. Battery 2 and 3 have not been sharing load
well since the cell failure on battery 2. Battery 3 now carries
almost 90% of the power load while battery 2 provides the remaining
10%. NASA power branch has been providing daily support in monitoring
the UARS battery condition. The FOT has been authorized to disable
all platform and instrument heaters on the SSPP. This will be done at
the earliest available opportunity.
The FOT has been directed to stand down from the first planned orbit
lowering burn on 29 September 2005 by NASA headquarters. This stand
down order, coupled with the slightly reduced duty cycle of the UARS 4-
thruster mode will mean that the FOT will not be able to keep to its
plan of de-orbiting UARS as quickly as possible due to the cell
failure on battery 2. The earliest that the FOT will be able to
completely expend all the hydrazine onboard will be sometime in early
to mid December 2005.
MEETINGS
The FOT attended a post burn de-brief meeting this week on 26
September 2005. The FOT and FDF presented their analysis of the 2 «
minute burn from the previous week. The analysis showed that the
calculated duty cycle of ~ 75% was a less than what was previously
anticipated. FDF recommended that at least one if not 2 additional
burns would be needed in December 2005 to completely expend the
hydrazine onboard.
The FOT also attended a Technical Working Group meeting on 29
September 2005 to plan for the two upcoming 18-minute burns on 04
October 2005 and 06 October 2005.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 25 October 2005 (DOY 298).
This maneuver will be a Reverse to Forward Flight maneuver (Southern
Hemisphere viewing).
UARS has been given permission to execute the scheduled 18-minute
burns on 04 October 2005 and 06 October 2005. Authorization has also
been given to complete as many burns as possible in the current yaw
direction. The FOT will proceed with the remaining burns scheduled
for 12 October 2005, 18 October 2005, and 20 October 2005.
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 30 September 2005
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
76860 268/1341 05-347 HALOE POWER ON PT 1
76863 268/1925 05-348 HALOE POWER ON PT 2
76880 269/2216 05-349 HALOE POWER OFF
76926 273/0028 05-350 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 30 September 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 30 September 2005
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
76926 273/0033 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 30 September 2005
23 September 2005 - GMT Day 266 Beta = 24.1 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(%)
--- ------- -------- ---------- ----- ------- ------
1 728.0/ 728.0 -1.79/ -3.05 +00.0/+00. 04.6 0.00 0.0
2 -700.0/-700.0 -0.54/ -1.79 +16.8/-06.8 26.4 1.05 3.7
3 067.2/-056.0 +10.06/ +7.41 +50.4/-25.0 26.4 1.03 29.2
30 September 2005 - GMT Day 273 Beta = 58.2 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(%)
--- ------- -------- ---------- ----- ------- ------
1 728.0/ 728.0 -1.79/ -2.42 +00.0/+00.0 04.6 0.00 0.0
2 -700.0/-700.0 -1.48/ -2.42 +08.0/-03.2 26.4 1.09 2.2
3 084.0/ 033.6 +10.40/ +9.06 +38.0/-24.0 26.4 1.04 27.6
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 30 September 2005
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
05-044 FOT 76927 273/0126 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
------ ------ ----- ---- --- -----------------
05-042 MPS 76339 233/2347 N/A BATTERY 2 DIFFV -700mV
05-044 FOT See List Sept 05 30832 Generic Late Acquisition