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UARS WEEKLY STATUS REPORT - 08 JUL 2005
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SOLSTICE
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SOLSTICE began day only operations on Thursday in support of the yaw
maneuver. Otherwise, the instrument continues to perform exceptionally,
taking solar data on all available orbital tracking periods. An average
of 66% of data were returned this week accounting for 508 minutes of
solar observing time.
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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, O2 occultation, and continuous monitoring
scans for time periods with UARS telemetry or tape recording.
SUSIM hUARS continues to make Ly-a (121.6 nm) mesurements. Calibrated
Ly-a irradiances are available through the end of 2002 (v21r3). For
details, please see the "News" section of the SUSIM WWW site:
http://solphys.nrl.navy.mil/susim_uars.html
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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 2005069 has been processed and is waiting for archival
at the DAAC. HEPSA data for 2005070 to 2005079 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
2005069 has been processed and is waiting for DAAC archival. MEPS data for
2005070 to 2005079 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 25 June 2005 (Orbit 75467, GMT Day 176) through
01 July 2005 (Orbit 75572, GMT Day 182).
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 177/1330 75490 POWER ON
PEM 177/1542 75492 ZEPS / HEPS OFF
The beta angle ranged between the angles of 64.6 degrees to 35.9
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 1 degree on 10 July 2005 (DOY 191).
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 3.20 to 2.54 degrees C. Additional
battery performance data for each battery on 24 June 2005 and 01 July
2005 are provided in Appendix D.
The clock error ranged from 08.3 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 = 02
PEM = 01
HALOE = 02
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
UARS successfully finished flying through its high beta period last
week. As the beta angle began to move back down from its peak of 80
degrees, the charge level was raised from VT level 3 to 4 and then to
VT 5 on the 176/1706 event. Throughout this period the batteries were
able to support SUSIM and SOLSTICE fulltime, and HALOE was powered
back on during the 177/1330 event.
The UARS OBC clock rollover effort continued this week with a meeting
to discuss the possible contingencies during the uplink. The uplink
procedure is now fairly complete, so the effort is now turning towards
the ground system transition plan. As of the meeting with the Eclipse
development team on 28 June 2005 a preliminary build is expected the week of
July 11th.
MEETINGS
The FOT attended a telecon with the Eclipse development team on 28
June 2005 to discuss the patch needed for the ground system to accept
the new onboard epoch year.
The FOT also attended a meeting with the PACOR software team on 29
June 2005 to discuss their readiness for the epoch year update. A
software fix is needed on their end to support the epoch update and
progress of this fix will be monitored via a weekly Wednesday meeting.
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 01 July 2005
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
75478 176/1706 05-201 MPS VT LEVEL 5
75490 177/1330 05-202 HALOE POWER ON (PART 1)
75492 177/1542 05-203 PEM ZEPS/HEPS OFF
75493 177/1805 05-204 HALOE POWER ON (PART 2)
75494 177/1944 05-205 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 01 July 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 July 2005
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
75494 177/2009 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 01 July 2005
24 June 2005 - GMT Day 175 Beta = 68.7 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 11.2/ -22.4 -3.05/-3.99 +00.0/+00.0 05.8 0.00 0.0
2 -89.6/-201.6 +4.19/+3.23 +20.8/-16.4 26.2 1.03 16.5
3 22.4/-700.0 +1.66/+1.03 +14.4/-10.0 26.2 1.06 10.2
01 July 2005 - GMT Day 182 Beta = 35.9 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 11.2/ -11.2 -3.68/-4.94 +00.0/+00.0 05.8 0.00 0.0
2 -67.2/-246.4 +6.43/+5.14 +28.8/-18.0 25.8 1.03 21.4
3 123.2/-700.0 +3.23/+2.60 +21.6/-12.0 25.6 1.05 15.2
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
75478 176/1706 LV4 -> LV5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 01 July 2005
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
05-030 FOT 75537 180/1615 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