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UARS WEEKLY STATUS REPORT - 22 APR 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 2004366 has been reprocessed and archived at the GSFC DAAC.
MEPS data files are version 1. Processed MEPS data files at the DAAC
archive are between 1991274 and 2004366.
PEM continues to receive NMC data files from NOAA. NMC host machine
changed during mid-January which caused some NMC data transfer failures;
however, this situation was corrected and recovery completed with the
assistance of Roger Lin at 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 09 April 2005 (Orbit 74309, GMT Day 099) through
15 April 2005 (Orbit 74414, GMT Day 105).
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
SUSIM 101/1354 74347 POWER ON
HRDI 103/1347 74377 POWER ON - FULL TIME
HRDI 105/0114 74400 FULLTIME TO LOW POWER
HALOE 105/1341 74408 POWER ON
The beta angle ranged between the angles of 65.4 degrees to 52.7
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 1 degree on 29 April 2005 (DOY 119).
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 4.83 to 3.82 degrees C. Additional
battery performance data for each battery on 08 April 2005 and 15
April 2005 are provided in Appendix D.
The clock error ranged from 9.3 to -10.8 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
SUSIM = 01
HRDI = 02
HALOE = 03
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 power on instruments incrementally to
see how the batteries would respond to higher loads. The first
instrument powered on was SUSIM on 11 April 2005. The batteries
continued to operate well following this turn on. Then on 13 April
2005 HRDI was powered on to prepare for their full calibration the
following day. The batteries showed some effects of this turn on, but
maintained the load well for two days. HRDI was then powered off at
the end of GMT day 104 in preparation for the HALOE turn on the
following day. HALOE was powered on the 105/1341 event. This caused
battery 3 to hit its max telemetry value on differential voltage of -
700 mV and an increase in battery 2 differential voltage as well. The
spacecraft finished the week in this configuration with the
contingency of turning off SUSIM and SOLSTICE should the differential
levels not come back to fairly nominal levels.
Also this week, the FOT continued its testing of the solar array
drive. Once again both sides of the drive were utilized in order to
characterize their performance. The drive was moved 25 degrees in
either direction from 270, however the results from these test runs
were inconsistent. Only the rewind time on the B drive and the
ability to move the drive in the forward direction via switching back
and forth between drives, seem to be repeatable. All other tests show
different results at different times. Due to the complexity of the
drive itself and the number of failure scenarios, it may take some
time to isolate the problem or problems. The FOT will continue to
analyze the data collected so far and run more tests on both drives
next week.
MEETINGS
None this report period.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 29 April 2005 (DOY 119). 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 15 April 2005
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
74347 101/1354 05-121 SUSIM POWER ON - PART ONE
74361 102/1112 05-121 SUSIM POWER ON - PART TWO
74365 102/1723 05-122 SADDE SADDE TESTING
74367 102/2048 05-123 PMONS CLR/RESET PMONS/STATBUF
74377 103/1347 05-124 HRDI POWER ON - FULL TIME
74379 103/1645 05-125 SADDE SADDE TEST
74385 104/0115 05-126 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
74400 105/0114 05-127 HRDI FULLTIME TO LOW POWER
74408 105/1341 05-128 HALOE HALOE ON PART 1
74410 105/1817 05-129 HALOE HALOE ON PART 2
74411 105/1856 05-130 HALOE UPDATE DAC VALUES
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 15 April 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 15 April 2005
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
74243 094/1517 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
74271 096/1233 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
74296 098/0400 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 15 April 2005
08 April 2005 - GMT Day 098 Beta = 64.4 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 -4.31/-4.94 +00.0/+00.0 06.9 0.00 0.0
2 302.4/ 100.8 +5.79/+4.50 +19.6/-12.8 26.1 1.11 14.2
3 78.4/-403.2 +1.97/+1.34 +16.8/-12.0 26.1 1.06 13.2
15 April 2005 - GMT Day 105 Beta = 52.7 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 06.9 0.00 0.0
2 291.2/ 44.8 +7.74/+5.79 +25.6/-17.2 25.8 1.04 19.2
3 190.4/-700.0 +2.91/+1.97 +20.0/-13.2 25.8 1.02 15.4
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 15 April 2005
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
05-023 FOT 74321 099/2017 30832 Generic Late Acquisition
05-023 FOT 74327 100/0457 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
05-024 FOT 74247 094/2214 39145 No 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
------ ------ ----- ---- --- -----------------
05-023 FOT See List Apr 05 30832 Generic Late Acquisition