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UARS WEEKLY STATUS REPORT - 20 Aug 2004
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SOLSTICE
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SOLSTICE began day only operations on day 229 in support of the yaw
maneuver. This mode continues until day 234. Otherwise, the instrument
continues to perform exceptionally, taking solar data on all available
orbital tracking periods. An average of 52% of data were returned this
week accounting for 359 minutes of solar observing time.
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SUSIM
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SUSIM was turned off for the yaw-around on August 15. Earlier, the
experiment successfully gathered 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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HEPSA data files are version 2. Currently, HEPSA data between 1991274
and 2004059 has been reprocessed and archived at the GSFC DAAC. Currently,
HEPSA data between 2004060 and 2004069 has been processed waiting for
archival at the GSFC DAAC.
MEPS data files are version 1. Processed MEPS data files at the
DAAC archive are between 1991274 and 2004039. Currently, MEPS data between
2004040 and 2004069 has been processed waiting for archival at the GSFC DAAC.
PEM continues to receive NMC data files from NOAA. No problems have
been encountered.
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.
*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 07 August 2004 (Orbit 70623, GMT Day 220) through
13 August 2004 (Orbit 70729, GMT Day 226).
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 226/2324 70728 POWER OFF
The beta angle ranged between the angles of 35.1 degrees to 16.5
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 18 August 2004 (DOY 231).
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 0.32 to 0.64 degrees C. Additional
battery performance data for each battery on 06 July and 13 August
2004 are provided in Appendix D.
The clock error ranged from 2.8 to -9.3 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 = 01
HALOE = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 04
Four (4) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
Four (4) 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 past week on the 223/0121 Z event, VT-6 was commanded due to the
differential voltage being greater than 180 mV for three consecutive
orbits. The differential voltage returned to nominal values after two
orbits subsequent to the change. The spacecraft remained in VT-6 for
the rest of the week.
The FOT completed the testing of the new version of the Eclipse ground
system software. Only one out of the fourteen DRs delivered did not
function properly. The build will be released to operations despite
this discrepancy. Due to scheduling issues with key personnel during
the next few weeks, the build will not be put onto the servers until
07 September 2004.
The new CMS code to allow for SMA events continued to undergo testing
this week. Problems receiving products from FDF, transferring the
schedule from UPS to CMS, and system drive issues hindered progress.
While the FDF product and system drive issues have been resolved, the
transfer issue is still under investigation.
MEETINGS
The FOT attended a meeting on 11 August 2004 with FDF and the HRDI
team to discuss the attitude discrepancy found in the HRDI data. The
FOT was assigned the task of running some simulations to see if the
noise parameters on the FSS can be adjusted to reduce the attitude
error. This will be started next week.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 18 August 2004 (DOY 231).
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 13 August 2004
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
70669 223/0119 04-230 MPS VT LEVEL 6
70728 226/2324 04-231 HALOE POWER OFF
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 13 August 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 13 August 2004
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
-None this report period.
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 13 August 2004
06 August 2004 - GMT Day 219 Beta = 36.7 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 -3.05/-4.31 +00.0/+00.0 07.0 0.00 0.0
2 -00.0/-212.8 +5.15/+3.87 +26.8/-14.4 25.6 1.04 20.0
3 +33.6/-033.6 +3.87/+2.92 +26.4/-14.4 25.4 1.03 19.5
13 August 2004 - GMT Day 226 Beta = 16.5 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 -3.05/-3.68 +00.0/+00.0 07.0 0.00 0.0
2 -00.0/-22.4 +5.79/+5.47 +24.8/-12.0 26.7 1.02 20.5
3 +22.4/-00.0 +4.83/+4.19 +24.0/-12.0 26.7 1.02 20.0
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
70669 223/0119 LV5 -> LV6
APPENDIX E
UARS ANOMALY REPORTS
Week ending 13 August 2004
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
04-053 FOT 70674 223/0845 36597 No Acquisition GDIS Prob at WS
04-054 FOT 70708 225/1549 36643 Bad Weather conditions @ Guam
04-055 FOT 70711 224/2037 36648 Data Dropout
04-050 FOT 70714 226/0111 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
04-051 FOT 70564 216/0211 36541 Data Dropout
04-052 FOT 70576 216/2103 36556 Loss of Downlink
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
------ ------ ----- ---- --- -----------------
04-050 FOT See List August 04 30832 Generic Late Acquisition
04-053 FOT 70674 223/0845 36597 No Acquisition GDIS Prob at WS
04-054 FOT 70708 225/1549 36643 Bad Weather conditions @ Guam
04-055 FOT 70711 224/2037 36648 Data Dropout