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UARS WEEKLY STATUS REPORT - 17 Jan 2003
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SOLSTICE
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During this week, SOLSTICE continued to operate in good health gathering
solar data on all available orbital tracking periods.
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SUSIM
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SUSIM successfully gathered all of its daily 1.1 nm (mid) resolution
and MgII solar scans this past week during periods of predicted UARS
telemetry.
For Tuesday, Jan. 21, we have planned a series of molecular oxygen
occultation scans at 141, 160, and 170 nm, the first of these done
since 1999.
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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 1994365 has been
reprocessed. PEM HEPSA data from 1995001 through 1995069 is waiting for DAAC
archive.
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 04 January 2003 (Orbit 61887, GMT Day 004) through
10 January 2003 (Orbit 61991, GMT Day 010).
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
HRDI 004/0223 61888 DAY-ONLY OPS
HRDI 007/0153 61933 FULLTIME OPS
The beta angle ranged between the angles of 69.6 degrees to 76.7
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 1.26 to 1.64 degrees C. Additional
battery performance data for each battery on 03 January and 10 January
2003 are provided in Appendix D.
The clock error ranged from -10.3 to 10.4 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
HRDI = 02
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 02
Three (3) Anomaly Reports remained OPEN at the end of this report
period (see Appendix E).
GROUND SYSTEM OPERATION
Two (2) 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 still finishing up some clean up activities from the OBC
Halt anomaly. These activities include editing the clock correlation
procedure and rewriting some safehold recovery procedures. The FOT
has also added the MODE3I flag change needed in the UFLTR
reinitialization procedure.
MEETINGS
The FOT attended an FDF product meeting on 06 January 2003. The
purpose of this meeting was to discuss eliminated or reducing the
frequency of the FDF products delivered to UARS/ERBS/TOMS.
The Monthly Status Review was held on 07 January 2003 in order to
review the activities for UARS last month and future plans.
FUTURE SIGNIFICANT EVENTS
The students will be returning to the control center starting 13
January 2003.
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 10 January 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
61888 004/0223 03-001 HRDI TO DAY-ONLY OPS
61901 004/2221 03-002 OBC/CLK CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
61917 006/0036 03-003 PEM AXIS POWER OFF
61928 006/1855 03-004 SADDE SADDE SAFEHOLD OFF
61933 007/0153 03-005 HRDI TO FULLTIME
61936 007/0734 03-006 OBC/CLK CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
61963 009/0149 03-007 OBC/CLK CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 10 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 10 January 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
61901 004/2224 CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
61936 007/0753 CLK ADJ FR 41.2 TO 20.6 MSEC/DAY
61963 009/0154 CLK ADJ FR 20.6 TO 41.2 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 10 January 2003
03 January 2003 - GMT Day 003 Beta = 67.9 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 -156.8/-179.2 -3.05/-4.63 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-22.4 +3.87/+2.60 +20.4/-15.2 26.4 1.040 16.9
3 +16.8/-22.4 +2.91/+1.65 +19.6/-15.2 26.4 1.040 16.7
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
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 10 January 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-002 FOT 61930 003/2118 30832 Generic Late Acquisition
03-003 FOT 61935 007/0515 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-058 FOT 61113 317/1341 N/A NEG ACQ / UFLTR ERROR
02-059 FOT 61797 363/0021 30832 Generic Late Acquisition
ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-058 FOT 61113 317/1341 N/A NEG ACQ / UFLTR ERROR
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 61930 003/2118 30832 Generic Late Acquisition
03-003 FOT 61935 007/0515 30832 Generic Late Acquisition