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UARS WEEKLY STATUS REPORT - 11 June 2004
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SOLSTICE
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This week, SOLSTICE continued to operate in good health gathering solar
data on all available orbital tracking periods. On average, we received
57% of each day's data amounting to about 527 minutes of solar
observing time per day.
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SUSIM
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SUSIM was turned off on June 3 to conserve power during the low beta
period surround the yaw-around. After the turn on June 9, the
experiment successfully gathered its daily mid (1.1 nm) resolution,
MgII, occultation, solar pointing offset, and continuous monitoring
scans for periods of UARS real-time telemetry or onboard tape
recording.
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PEM
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Level 2 PEM HEPSA data files are being reprocessed for submission to the
DAAC. This data has been designated as version 2; however, there is no format
difference from the version 1 data format. Version 2 HEPSA data is being
generated because it was discovered that there exists processing errors within
some of the HEPSA version 1 data files. Thus, if you are using any HEPSA
version 1 data files from the DAAC, please replace them with the version 2
data files. Currently, HEPSA data between 1991274 and 2003365 has been
reprocessed and archived at the GSFC DAAC.
Level 2 PEM MEPS data file documentation is complete and submitted to
the DAAC. MEPS data files are version 1. Processed MEPS data files at the
DAAC archive are between 1991274 and 2000039. MEPS data files between
2000040 and 2000079 are waiting for DAAC collection.
PEM continues to receive NMC data files from NOAA. No problems have
been encountered. NOAA has changed the binary structure of the NMC data and
PEM is now receiving two data streams, one in the original VAX format and the
other from their new binary format.
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
*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 29 May 2004 (Orbit 69570, GMT Day 150) through
4 June 2004 (Orbit 69675, GMT Day 156).
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 153/2128 69629 POWER OFF
PEM 155/2023 69658 ZEPS/HEPS OFF
SUSIM 155/2124 69659 POWER OFF
SOLSTICE 155/2202 69659 FULLTIME TO DAY-ONLY OPS
The beta angle ranged between the angles of 28.6 degrees to 8.7
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 06 June 2004 (DOY 158).
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 0.64 to 0.95 degrees C. Additional
battery performance data for each battery on 28 May and 04 June 2004
are provided in Appendix D.
The clock error ranged from 10.1 to -10.3 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
SUSIM = 01
SOLSTICE = 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
The FOT attempted to recreate the yaw wheel anomaly on the simulator
this week. Unfortunately, there were some problems getting the UTTS
scenario to work properly, so this work will continue next week.
A few days before the previous yaw maneuver high differential values
were seen on Battery 2, but no indication of that has been seen prior
to the yaw maneuver. The FOT will keep a close eye on the differential
voltage after the yaw.
MEETINGS
The FOT attended the UARS Monthly Status meeting to discuss the
significant events for the month of May.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 06 June 2004 (DOY 158). This
maneuver will be a Reverse to Forward Flight maneuver (Southern
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 04 June 2004
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
69620 153/0750 04-154 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
69629 153/2128 04-155 HALOE POWER OFF
69639 154/1307 04-156 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
69642 154/1803 04-157 OBC SOFTWARE BANK DUMPS
69658 155/2023 04-158 PEM ZEPS/HEPS OFF
69659 155/2124 04-159 SUSIM POWER OFF
69659 155/2202 04-160 SOSLSTICE FULLTIME TO DAY-ONLY OPS
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 04 June 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 04 June 2004
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
69620 153/0750 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
69639 154/1330 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 04 June 2004
28 May 2004 - GMT Day 149 Beta = 30.1 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 -2.73/-3.99 +00.0/+00.0 07.0 0.00 0.0
2 +44.8/-16.8 +6.44/+5.15 +27.2/-13.6 23.8 1.03 20.6
3 +67.2/-22.4 +5.15/+4.19 +26.4/-13.6 23.7 1.02 20.3
04 June 2004 - GMT Day 156 Beta = 08.7 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 -3.36/-4.94 +00.0/+00.0 07.0 0.00 0.0
2 +22.4/-33.6 +4.51/+3.87 +27.2/-12.8 25.4 1.01 19.9
3 +22.4/-33.6 +3.55/+2.60 +26.4/-12.8 25.4 1.00 19.5
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 04 June 2004
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
04-031 FOT 69662 156/0159 36027 TDRSS WEST OUTAGE
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
04-024 FOT See List May 04 30832 Generic 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
------ ------ ----- ---- --- -----------------
04-031 FOT 69662 156/0159 36027 TDRSS WEST OUTAGE