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UARS WEEKLY STATUS REPORT - 27 SEP 2002
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SOLSTICE
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SOLSTICE continues to operate normally, taking solar data on all
available orbital tracking periods.
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SUSIM
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On September 24 and 25, the UARS did not receive all of the
telemetry contacts that the UARS team had requested. Consequently,
a large part of the daily mid resolution scans on those days were
lost due to lack of TDRSS telemetry. This can be seen by going to
the SUSIM homepage and clicking on "Plots of Recent Days' Solar and
Lamp Scans".
Also, the proposed telemetry contacts for September 30 and October 1
do not contain enough telemetry time during S/C day to gather 1.1 nm
scans over the entire 115-410 nm wavelength interval.
Otherwise, SUSIM successfully performed its daily mid-resolution and
MgII solar scans during this past week for periods of predicted UARS
telemetry.
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ACRIM
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Nothing received.
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PEM
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Nothing received.
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HALOE
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HALOE was successfully powered on during the second attempt Thursday, day
269 at approximately 20:00. All engineering parameters are within nominal
operations and voltages on the science channels are as expected.
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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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On Sept. 20/21 we were successful in turning WINDII on and producing
data. Prior to that we had a problem in that WINDII would come on, but
without producing any data. The solution seems to depend on the timing
of the sending of the uploads and while we don't understand it, we think
we have a workable procedure. So we now consider WINDII ready for
normal operations again, and can coordinate with TIMED again.
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MPG
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The MPG continues to serve as the point-of-contact for UARS
instrument operations to support re-engineering of the UARS
Mission Operations Concept to develop capabilities for the
Science Traceability Mission.
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 14 September 2002 (Orbit 60203, GMT Day 257)
through 20 September 2002 (Orbit 60307, GMT Day 263).
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 261/2143 60277 POWER OFF
WINDII 263/1203 60301 POWER ON
The beta angle ranged between the angles of 38.3 degrees to 54.9
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 57 degrees on 23 September 2002 (DOY 266).
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 1.57 to 1.91 degrees C. Additional
battery performance data for each battery on 06 September and 13
September 2002 are provided in Appendix D.
The clock error ranged from -11.0 to 10.5 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 = 02
HALOE = 01
WINDII = 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 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 UARS FOT is now in the process of helping with the integration of
the ERBS FOT. This process began on 16 September 2002. ERBS hardware
has started making its way over from Building 14 and will continue to
flow in this week. ERBS will take all of its events next week from
the horseshoe in Building 32. We hope that the ERBS team has the same
success that we experienced in getting fully operational on the new
system.
The hard disk on the prototype was temporarily fixed but is now
malfunctioning again. This problem should go away when the new hard
disk is installed this week. This will allow the FOT to test the
patches that have been made by the Eclipse development team. Once the
patches have been tested a new delivery of the software will be
installed. This will most likely not take place until the ERBS
integration is complete.
MEETINGS
- None this report period
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 10 October 2002 (DOY 283).
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 20 September 2002
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
60277 261/2143 02-326 HALOE POWER OFF
60289 262/1722 02-327 OBC CLK ADJ FR 20.6 TO 0.00 MSEC/DAY
60301 263/1203 02-328 WINDII POWER ON
60322 264/2138 02-329 OBC CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 20 September 2002
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 20 September 2002
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
60289 262/1725 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
60322 264/2140 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 20 September 2002
13 September 2002 - GMT Day 256 Beta = 34.6 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 -140.0/-162.4 -3.05/-4.31 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-123.2 +5.79/+4.51 +27.6/-15.2 24.5 1.040 20.9
3 +22.4/-67.2 +5.15/+3.87 +27.2/-15.2 24.3 1.040 20.6
20 September 2002 - GMT Day 263 Beta = 54.9 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 -140.0/-168.0 -3.05/-4.62 +00.0/+00.0 08.5 0.000 0.0
2 +11.2/-56.0 +4.51/+2.60 +22.4/-15.2 25.3 0.980 19.7
3 +16.8/-56.0 +3.23/+1.66 +22.0/-15.2 25.1 0.980 19.3
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 20 September 2002
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-049 FOT 60293 263/0002 31477 NONSTANDARD BLIND ACQ
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-045 FOT 59717 224/1458 14170 Generic Late Acquisition
ANOMALY INVESTIGATION REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-049 FOT 60293 263/0002 31477 NONSTANDARD BLIND ACQ