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UARS WEEKLY STATUS REPORT - 8 April 2005
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SOLSTICE
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SOLSTICE resumed normal operations this week (doy 096) after performing
day only operations since the yaw maneuver. Otherwise, the instrument
continues to perform well, taking solar data on all available orbital
tracking periods. An average of 60% of data were returned this week
accounting for 435 minutes of solar observing time per day.
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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 2004299 has been reprocessed and archived at the GSFC DAAC. HEPSA data
between 2004300 and 2004359 are currently waiting archival at GSFC DAAC.
HEPSA data between 2004360 and 2004366 are currently being processed.
MEPS data files are version 1. Processed MEPS data files at the DAAC
archive are between 1991274 and 2004309. MEPS data between 2004330 and 2004359
are currently waiting archival at GSFC DAAC.
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 26 March 2005 (Orbit 74098, GMT Day 085) through
02 April 2005 (Orbit 74203, GMT Day 091).
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 087/0424 74131 POWER ON / DAY ONLY
HRDI 087/2132 74142 POWER ON / DAY ONLY
PEM 090/1538 74183 POWER OFF
HRDI 090/1538 74183 POWER OFF
The beta angle ranged between the angles of 17.1 degrees to 43.1
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 65 degrees on 09 April 2005 (DOY 099).
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 4.49 to 3.82 degrees C. Additional
battery performance data for each battery on 21 March 2005 and 01
April 2005 are provided in Appendix D.
The clock error ranged from 10.9 to -11.7 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 = 12
PEM = 02
HRDI = 02
WINDII = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 01
One (1) Anomaly Report 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
For most of the week the FOT continued to operate the batteries at the
VT-6 charge rate. However, as the beta angle increased and the power
available profile increased, the FOT noticed high C/D ratios even at
VT-6. PEM, HRDI and SOLSTICE were operated in their day-only mode to
try to minimize this higher charge, but had a minimal effect on the
C/D ratio. Also, battery 2 was still operating near 10C, so the
decision was made on day 090 on the 1504 event to go down to VT-5. In
order to drop VT levels PEM and HRDI were both removed from day-only
operations. The spacecraft will remain in this configuration over the
weekend and the FOT will analyze the batteries performance at this
level next week.
This week the FOT began its tests of the solar array drive on 30 March
2005 and 01 April 2005. Both sides of the drive were used in order to
characterize their performance. The drive was moved 20 degrees in
either direction, however the results from these test runs were
inconclusive. More testing will be done next week to try to isolate
the nature of the problem.
Also this week, UARS began using this new SMA functionality starting
on 28 March 2005. However, given the current battery issues the
instrument load has been minimal. Hopefully, the batteries will
stabilize next week and some instruments will be able to be turned on.
MEETINGS
The FOT held a meeting with the NASA power branch on 29 March 2005 to
discuss the current battery situation and the best course of action
for the next few days. It was decided at this meeting, to go to VT-5
the following day to reduce the battery 2 temperature and C/D ratio.
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 01 April 2005
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
74129 087/0104 05-095 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
74131 087/0424 05-096 PEM POWER ON / DAY ONLY
74142 087/2132 05-097 HRDI POWER ON / DAY ONLY
74146 088/0420 05-098 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
74156 088/2055 05-099 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
74157 088/2203 05-100 WINDII POWER ON / OFF
74159 089/0057 05-100 WINDII POWER ON / OFF (PWR MGMT)
74160 089/0237 05-100 WINDII POWER ON / OFF (PWR MGMT)
74167 089/1436 05-101 TMON LOAD RTS 8 & 9 DIS TMONS
74167 089/1436 05-102 PMON WINDII PMONS 15 & 17
74168 089/1540 05-103 SADDE MOVE DRIVE B (ENGR TEST)
74169 089/1755 05-104 PMON WINDII PMONS 14 & 16
74171 089/1944 05-105 SADDE MOVE DRIVE A (ENGR TEST)
74174 090/0054 05-106 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
74183 090/1504 05-107 MPS MPS L6 -> VT-5
74183 090/1538 05-108 PEM/HRDI PEM / HRDI POWER OFF
74197 091/1429 05-109 SADDE SADDE TEST - A-SIDE
74198 091/1459 05-110 SADDE SADDE TEST - B-SIDE
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 01 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 01 April 2005
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
74129 087/0111 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
74146 088/0430 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
74156 088/2058 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
74174 090/0117 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 01 April 2005
25 March 2005 - GMT Day 084 Beta = 13.5 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 -2.11/- 3.05 +00.0/+00.0 06.9 0.00 0.0
2 212.8/ 89.6 +13.49/+12.10 +29.6/-14.8 26.7 1.14 18.6
3 00.0/-593.6 +6.44/+ 5.79 +24.0/-11.2 26.6 1.07 16.1
01 April 2005 - GMT Day 091 Beta = 43.1 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 -700.0/-700.0 -3.68/-4.94 +00.0/+00.0 06.9 0.00 0.0
2 291.2/ 89.6 +7.09/+5.79 +26.8/-14.4 25.8 1.07 15.4
3 78.4/-700.0 +2.60/+1.97 +20.8/-12.0 25.8 1.02 13.2
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
74183 090/1504 LV6 -> LV5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 01 April 2005
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
05-012 FOT 74160 089/0334 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
05-020 PEM 74026 080/0503 N/A ZEPS/NEPS turned off
05-021 MPS 74038 080/2332 N/A BAT 3 DIFFV -694 R-HI
05-022 OBC 74083 084/0041 N/A S/W Stored Cmd Error
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
------ ------ ----- ---- --- -----------------
05-012 FOT See List Mar 05 30832 Generic Late Acquisition