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UARS WEEKLY STATUS REPORT - 7 March 2003
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SOLSTICE
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This week, SOLSTICE was powered only during daylight for three days to
support the yaw maneuver. Otherwise, solar data were collected on all
available orbital tracking periods.
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SUSIM
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Nothing received.
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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 2001229 has been
reprocessed and archived at the GSFC DAAC. Files for 2001230 through 2001259
are wating archival at the 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 22 February 2003 (Orbit 62624, GMT Day 053) through
28 February 2003 (Orbit 62728, GMT Day 059).
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
HRDI 054/0502 62641 DAY-ONLY OPS
ACRIM 054/1602 62648 POWER ON A SIDE
ACRIM 055/0039 62654 A SIDE OFF/B ON
PEM 055/2252 62667 AXIS 1 OFF
HALOE 056/2251 62683 POWER OFF
ACRIM 057/1333 62692 POWER ON A SIDE
ACRIM 057/2104 62697 POWER OFF
PEM 058/2103 62712 POWER OFF ZEPS & NEPS
SOLSTICE 058/2300 62713 FULLTIME TO DAY ONLY OPS
SUSIM 058/2300 62713 POWER OFF
The beta angle ranged between the angles of 26.8 degrees to 6.3
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 01 March 2003 (DOY 060).
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 0.63 to 0.96 degrees C. Additional
battery performance data for each battery on 21 February and 28
February 2003 are provided in Appendix D.
The clock error ranged from -10.1 to 9.1 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 = 01
HRDI = 01
ACRIM = 01
PEM = 02
HALOE = 01
SOLSTICE = 01
SUSIM = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 00
Two (2) Anomaly Report remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
Zero (0) 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 in the process of testing the new software release of the
Eclipse software (Version 2.1). This release contains several fixes
in response to DRs written, including wait statement and status buffer
issues. Due to the extent of the changes made, it may take a few
weeks to perform all the testing needed to get this new build to
operations.
MEETINGS
-None this report period
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 01 March 2003 (DOY 060). 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 28 February 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
62641 054/0502 03-044 HRDI DAY-ONLY OPS
62648 054/1602 03-045 ACRIM POWER ON A SIDE
62654 055/0039 03-045 ACRIM A SIDE OFF/B ON
62667 055/2252 03-046 PEM AXIS 1 OFF
62683 056/2251 03-047 HALOE POWER OFF
62692 057/1333 03-045 ACRIM POWER ON A SIDE
62697 057/2104 03-045 ACRIM POWER OFF
62712 058/2103 03-048 PEM POWER OFF ZEPS & NEPS
62713 058/2300 03-049 SOLSTICE FULLTIME TO DAY ONLY OPS
62713 058/2300 03-050 SUSIM POWER OFF
62718 059/0642 03-051 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 28 February 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 28 February 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
62718 059/0642 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 28 February 2003
21 February 2003 - GMT Day 052 Beta = 29.7 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 -168.0/-190.4 -3.05/-3.99 +00.0/+00.0 08.3 0.000 0.0
2 +44.8/-22.4 +6.44/+5.15 +28.8/-15.2 23.8 1.040 22.5
3 +22.4/-67.2 +5.47/+4.19 +28.4/-15.6 23.7 1.030 22.0
28 February 2003 - GMT Day 059 Beta = 6.3 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 -168.0/-196.0 -3.68/-4.94 +00.0/+00.0 08.3 0.000 0.0
2 +16.8/-22.4 +4.51/+3.55 +28.0/-12.8 25.9 1.020 19.9
3 +22.4/-22.4 +3.23/+2.60 +27.2/-12.8 25.9 1.020 19.5
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 28 February 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-004 FOT 62559 051/0916 30832 Generic Late Acquisition
03-004 FOT 62601 051/1208 30832 Generic Late Acquisition
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
03-005 FOT 62559 048/1757 32330 CDS Equipment problem