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UARS WEEKLY STATUS REPORT - 25 JUL 2003
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SOLSTICE
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SOLSTICE continues to perform nominally, taking solar data on all
available orbital tracking periods.
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SUSIM
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SUSIM successfully gathered all of its daily mid resolution,
weekly offset, and O2 occultation scans during periods of UARS
telemetry or periods of onboard tape recording.
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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 2002099 has been
reprocessed and 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. A new router was put in place to handle the
MPG RAC traffic. The replacement went smoothly, without
significant communication interruptions.
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 12 July 2003 (Orbit 64728, GMT Day 193) through 18
July 2003 (Orbit 64833, GMT Day 199).
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
HALOE 194/1349 64752 POWER ON
PEM AXIS 197/2253 64803 POWER OFF
WINDII 198/2031 64816 POWER ON
WINDII 198/2251 64818 POWER OFF
The beta angle ranged between the angles of 60.2 degrees to 34.1
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 26 July 2003 (DOY 207).
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 0.95 to 1.28 degrees C. Additional
battery performance data for each battery on 11 July and 18 July 2003
are provided in Appendix D.
The clock error ranged from -10.8 to 10.2 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
SUSIM = 01
HALOE = 01
PEM = 01
WINDII = 02
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 02
Two (2) Anomaly Report 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 SSPP changed OPMODE on 198/0139 GMT from OPLP (open loop) to WAIT.
This happened because the approval flag for incorporating SSPP data
into GMT day 198's ATC was not set properly. The SSPP remained in
this state until day 199's ATC began. The SSPP resumed normal
tracking on its own when day 199's ATC started at 199/0000 GMT.
MEETINGS
- None this report period
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 26 July 2003 (DOY 207). 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 18 July 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
64737 193/1352 03-180 SUSIM CLEAR EXCEPTIONS
64752 194/1349 03-181 HALOE POWER ON
64755 194/1850 03-181 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
64776 196/0504 03-182 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
64803 197/2253 03-184 PEM AXIS POWER OFF
64816 198/2031 03-185 WINDII POWER ON
64818 198/2251 03-186 WINDII POWER OFF
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 18 July 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 18 July 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
64755 194/1850 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
64776 196/0504 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 18 July 2003
11 July 2003 - GMT Day 192 Beta = 64.0 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 -700.0/-700.0 -2.73/-4.31 +00.0/-00.0 07.2 0.000 0.0
2 +00.0/-33.6 +3.14/+2.60 +20.0/-13.6 26.4 1.020 17.0
3 +16.8/-22.4 +2.60/+1.66 +19.2/-13.2 26.4 1.010 16.0
18 July 2003 - GMT Day 199 Beta = 34.1 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 07.2 0.000 0.0
2 +11.2/-112.0 +5.15/+3.87 +27.2/-16.0 24.2 1.030 19.8
3 +22.4/-44.8 +3.87/+2.92 +26.8/-16.0 24.2 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 18 July 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-034 FOT 64804 198/0139 N/A SSPP IN WRONG OPSTATE
03-031 FOT 64819 199/0037 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-033 FOT 64668 189/0022 N/A PMON-1 tripped due to low
pwr
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
------ ------ ----- ---- --- -----------------
03-034 FOT 64804 198/0139 N/A SSPP IN WRONG OPSTATE
03-031 FOT 64819 199/0037 30832 Generic Late Acquisition