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UARS WEEKLY STATUS REPORT - 03 Oct 2003
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SOLSTICE
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On Wednesday (2003/274) SOLSTICE began daylight only operations in
support of the yaw maneuver. This week we collected about 350 minutes of
solar observations and 50% of the day's data. SOLSTICE is operating in
good health.
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SUSIM
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SUSIM was turned off after its scans on October 1. Otherwise, the
instrument 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 2002259 has been
reprocessed and archived at the GSFC DAAC. HEPSA data files from 2002160
through 2002299 are processed and awaiting archiving 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.
The MPG participated in a meeting on 2 October which was
held to discuss progress current of the effort to modify UARS
ground station and flight software so that UARS can use
3 TDRS satellites each orbit.
The UARS Operations Calendar for 2004 (WORD, PDF version) is posted
on the UARS Science Home Page (http://umpgal.gsfc.nasa.gov)
under the heading "Publications." This calendar includes:
day of year, UARS day, predicted solar beta angles (from
18-month orbit parameter profile prepared on 18 August 2003),
and predicted dates for yaw maneuvers.
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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 20 September 2003 (Orbit 65781, GMT Day 263)
through 26 September 2003 (Orbit 65885, GMT Day 269).
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 263/1255 65789 POWER ON
HRDI 269/0916 65849 POWER OFF / LOW POWER
The beta angle ranged between the angles of 52.4 degrees to 32.9
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 03 October 2003 (DOY 276).
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 19 September and 26
September 2003 are provided in Appendix D.
The clock error ranged from -10.6 to 09.6 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
HALOE = 01
HRDI = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 01
One (1) Anomaly Report remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
One (1) operational support problem 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 continues to move forward with the 3 TDRS implementation.
This week the FOT worked on OBCSTF to begin the process of updating
the database for the required system table changes. The database
changes must be made in order to update the database on the CMS. Once
this is done and the database is put onto the CMS, then testing of the
new CMS software can begin.
MEETINGS
-None this report period
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 03 October 2003 (DOY 276).
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 26 September 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
65789 263/1255 03-253 HALOE POWER ON
65831 266/0808 03-254 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65849 267/1244 03-255 OBC/CLK CLK ADJ FT 20.6 TO 0.0 MSEC/DAY
65877 269/0916 03-256 HRDI POWER OFF / LOW POWER
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 26 September 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 26 September 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
65831 266/0811 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
65849 267/1310 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 26 September 2003
19 September 2003 - GMT Day 262 Beta = 55.2 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 -3.68/-4.62 +00.0/+00.0 07.2 0.000 0.0
2 +11.2/-22.4 +4.51/+3.23 +23.2/-15.2 25.8 1.040 19.2
3 +16.8/-44.8 +3.23/+2.29 +22.4/-15.2 25.6 1.030 18.9
26 September 2003 - GMT Day 269 Beta = 32.9 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 -700.0/-700.0 -3.05/-3.99 +00.0/+00.0 07.2 0.000 0.0
2 +16.8/-33.6 +5.79/+4.50 +28.0/-15.2 25.4 1.020 19.9
3 +22.4/-44.8 +4.50/+3.23 +27.2/-15.2 25.4 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 26 September 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-046 FOT 65815 265/0732 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-049 FOT 65723 259/0326 33745 Generic Drop out on the return
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
------ ------ ----- ---- --- -----------------
03-046 FOT See List Sept 03 30832 Generic Late Acquisition