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UARS WEEKLY STATUS REPORT - 18 April 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 occultation scans this past week during periods of UARS
telemetry.
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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 2001365 has been
reprocessed and archived at the GSFC DAAC. SwRI is working on reprocessing
data PEM for 2002.
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 05 April 2003 (Orbit 63255, GMT Day 095) through 11
April 2003 (Orbit 63359, GMT Day 101).
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
SOLSTICE 095/2251 63269 DAY ONLY OPS
SOLSTICE 099/1255 63323 POWER ON
SUSIM 099/1530 63325 POWER ON
HALOE 101/1244 63353 POWER ON
A Reverse-to-Forward Yaw Around maneuver (number 118) was successfully
executed in Orbit 63279 beginning 096/13:49:21Z and completing at
096/14:26:31Z on 6 April 2003. All instruments were in their off or
standby mode (except for SOLSTICE in day-only). Due to the SA
position at 269 degrees, the effective night length of the spacecraft
after the maneuver was approximately 55.71 minutes. Post maneuver
analysis of data indicate that during the Yaw Around, the end-of-night
load bus voltage was 26.08 volts and the average depths of discharge
(DODs) on Batteries 2 and 3 were approximately 20.86 and 20.27 percent
respectively. The next (forward-to-reverse) YAW is scheduled for 16
May 2003 (DOY 136).
The beta angle ranged between the angles of 08.6 degrees to 19.4
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 70 degrees on 26 April 2003 (DOY 116).
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 1.60 degrees C. Additional
battery performance data for each battery on 04 April and 11 April
2003 are provided in Appendix D.
The clock error ranged from -10.1 to 11.5 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 = 03
SOLSTICE = 02
SUSIM = 01
HALOE = 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 continued to work with the Raytheon development team this week
to prepare for the upcoming build at the end of the month. A
preliminary build is expected Tuesday of next week, so that some
testing can be done with the UARS simulator before the official build
is delivered. This is being done to help insure that the next
official build will work as planned and to provide the Raytheon team
with a more elaborate means of testing key functionality.
MEETINGS
The FOT also attended the weekly UARS DRB to review the open DRs and
discuss the details of the next Eclipse software delivery
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 16 May 2003 (DOY 136). This
maneuver will be a Forward to Reverse 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 11 April 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
63269 095/2251 03-084 SOLSTICE DAY-ONLY MODE
63277 096/1229 03-085 MACS YAW MANEUVER (FWD)
63293 097/1351 03-085 MPS VT LEVEL 5 (POST YAW)
63296 097/1757 03-085 MPS BATSOC RESET (POST YAW)
63315 099/0051 03-086 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
63323 099/1255 03-087 SOLSTICE POWER ON
63325 099/1530 03-089 SUSIM POWER ON (PART 1)
63334 100/0704 03-088 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
63338 100/1344 03-089 SUSIM POWER ON
63339 100/1528 03-089 SUSIM POWER ON (COMPLETE)
63353 101/1244 03-090 HALOE POWER ON
63357 101/1900 03-091 HALOE AZIMUTH ADJUST
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 11 April 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 11 April 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
63315 099/0101 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
63334 100/0727 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 11 April 2003
04 April 2003 - GMT Day 094 Beta = 12.9 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 -179.2/-201.6 -3.68/-4.94 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-22.4 +4.51/+3.87 +26.8/-15.2 26.1 1.020 20.0
3 +22.4/-22.4 +3.23/+2.60 +25.6/-14.4 26.1 1.010 19.6
11 April 2003 - GMT Day 101 Beta = 19.4 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 -179.2/-212.8 -3.99/-4.94 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-78.4 +5.15/+3.55 +28.8/-14.4 25.1 1.020 19.5
3 +22.4/-22.4 +3.23/+2.60 +28.0/-14.4 25.1 1.010 19.0
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
63278 096/1230 LV5 -> LV6
63293 097/1351 LV6 -> LV5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 11 April 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-011 FOT 63308 098/1349 30832 Generic Late Acquisition
03-012 FOT 63335 100/0738 32592 Generic Drop Out on the Relink
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-011 FOT 63308 098/1349 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
------ ------ ----- ---- --- -----------------
03-009 FOT 63069 082/1624 N/A Invalid COP Status
03-011 FOT 63308 098/1349 30832 Generic Late Acquisition
03-012 FOT 63335 100/0738 32592 Generic Drop Out on the Relink