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UARS WEEKLY STATUS REPORT - 24 Jan 2003
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SOLSTICE
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SOLSTICE continues to operate normally, taking solar data on all
available orbital tracking periods.
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SUSIM
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This past week, SUSIM successfully gathered all of its daily 1.1 nm
(mid) resolution MgII, and pointing offset solar scans during
periods of predicted UARS telemetry. The occultation scans of
Tuesday, Jan. 21, were only partially successful; we will try them
again soon.
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ACRIM
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Nothing received.
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PEM
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The PEM web site has moved. It has a new URL. Access the PEM web site
using http://wwwpem.space.swri.edu. The PEM data from the GUVI conjunction
periods has moved to http://wwwpem.space.swri.edu/guvi-pem.html.
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 1995365 has been
reprocessed.
PEM continues to work with the GUVI team on the diagnosis of data from
the first conjunction period. Analysis of the two conjunction passes showed
that the aurora as detected by GUVI was at higher latitude than UARS.
GUVI images from other times from the first conjunction period show spatial
regions that both GUVI and PEM sampled when aurora was present. Separation
is several minutes to 10's of minutes when both instruments saw aurora.
PEM has seen no aurora during the second conjunction period. Due to a
spacecraft anomaly, no PEM data was collected during the third conjunction
period.
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.
*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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WINDII
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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 11 January 2003 (Orbit 61992, GMT Day 011) through
17 January 2003 (Orbit 62096, GMT Day 017).
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
PEM 012/1339 62015 POWER ON - AXIS 1 & 2
WINDII 015/2242 62066 POWER OFF
HALOE 016/1148 62074 POWER ON
The beta angle ranged between the angles of 70.2 degrees to 44.5
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 27 January 2003 (DOY 027).
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 1.57 to 1.90 degrees C. Additional
battery performance data for each battery on 10 January and 17 January
2003 are provided in Appendix D.
The clock error ranged from -10.0 to 07.6 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
WINDII = 01
HALOE = 01
SUSIM = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 01
Two (2) Anomaly Report remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
One (1) 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
The FOT is awaiting an new build of the Eclipse ground software, which
is slated to arrive early next week. This build should correct
several DR issues, most importantly the wait statement problem seen in
the execution of some CECIL procedures. FOT testing of this build
will begin once the delivery is installed on the UARS prototype
system.
The FOT also welcomed back the Education Outreach students on 13
January 2003. The students have begun their second semester of
training and will be divided among ERBS/UARS/TOMS after their
evaluation on 07 February 2003.
MEETINGS
The FOT attended TDRS naming convention meeting on 14 January 2003 to
discuss the impacts of the new longitudinal names of TDRS East and
West.
The FOT also attended a weekly meeting at Capitol College on 17
January 2003 for the SOI Students to discuss openly any questions they
may have encountered in their studies.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 27 January 2003 (DOY 027).
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 17 January 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
61997 011/0907 03-008 OBC/CLK CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
62015 012/1339 03-009 PEM POWER ON - AXIS 1 & 2
62016 012/1432 03-009 PEM POWER ON - AXIS 1 & 2 (COMPLETED)
62065 015/2053 03-010 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
62066 015/2242 03-011 WINDII POWER OFF
62074 016/1148 03-012 HALOE POWER ON
62093 017/1731 03-013 SUSIM TIMING COMMANDS
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 17 January 2003
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 17 January 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
61997 011/0908 CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
62065 015/2055 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 17 January 2003
10 January 2003 - GMT Day 010 Beta = 76.7 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 -162.4/-179.2 -2.11/-3.68 +00.0/+00.0 08.3 0.000 0.0
2 -05.6/-33.6 +2.91/+1.65 +16.0/-15.2 27.0 1.100 12.9
3 +11.2/-22.4 +2.28/+1.34 +15.6/-14.4 27.0 1.090 12.6
17 January 2003 - GMT Day 017 Beta = 44.5 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 -162.4/-184.8 -3.68/-4.63 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-22.4 +5.46/+3.87 +26.4/-15.2 25.4 1.050 19.8
3 +33.6/-22.4 +4.50/+2.60 +25.6/-14.8 25.4 1.040 19.3
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 17 January 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-002 FOT 62035 013/2022 32101 18 sec data dropout
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
------ ------ ----- ---- --- -----------------
02-060 FOT 61421 338/0057 N/A PSU Cmd Clock Timeout
03-002 FOT 62035 013/2022 32101 18 sec data dropout