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UARS WEEKLY STATUS REPORT - 31 January 2003
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SOLSTICE
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In support of the yaw maneuver this week, SOLSTICE was in day only operations,
taking the default solar observations. Otherwise, SOLSTICE continues to
operate normally, taking solar data on all available orbital tracking periods.
The SORCE satellite was launched on Saturday January 25th taking with it the
next generation SOLSTICE instrument. We look forward to analyzing this overlap
data and continuing these long term solar measurements.
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SUSIM
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SUSIM was turned off January 26-29; scans were missed for January
27-29. Otherwise, SUSIM successfully gathered all of its daily 1.1
nm (mid) resolution MgII, and pointing offset solar scans during
periods of predicted UARS telemetry. Another set of sunrise
occultation scans have been scheduled for next week.
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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 1996220 has been
reprocessed and archived at the GSFC DAAC. HEPSA data between 1996221 and
1996366 is waiting to be archived at the GSFC DAAC.
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 18 January 2003 (Orbit 62097, GMT Day 018) through
24 January 2003 (Orbit 62202, GMT Day 024).
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 021/2158 62156 AXIS Power OFF
The beta angle ranged between the angles of 43.3 degrees to 14.0
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 1.27 to 1.29 degrees C. Additional
battery performance data for each battery on 17 January and 24 January
2003 are provided in Appendix D.
The clock error ranged from -11.0 to 10.1 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 = 04
PEM = 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 a 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.
MEETINGS
-None this report period
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 24 January 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
62113 019/0204 03-014 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
62130 020/0624 03-015 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
62153 021/1641 03-016 SUSIM TIMING COMMANDS
62156 021/2158 03-017 PEM AXIS POWER OFF
62169 022/1824 03-018 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
62186 023/2228 03-019 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 24 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 24 January 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
62113 019/0209 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
62130 020/0628 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
62169 022/1825 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
62186 023/2230 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 24 January 2003
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
24 January 2003 - GMT Day 024 Beta = 14.0 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 -3.36/-4.94 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-56.0 +5.79/+4.50 +32.1/-14.4 25.3 1.030 21.5
3 +33.6/-22.4 +4.50/+3.23 +28.8/-14.4 25.1 1.020 21.0
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 24 January 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-002 FOT 62102 018/0814 32101 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-002 FOT 62035 013/2022 32101 18 sec data dropout
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 62102 018/0814 32101 Generic Late Acquisition