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UARS WEEKLY STATUS REPORT - 15 Jun 2001
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SOLSTICE
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Nothing received.
***********
SUSIM
***********
Nothing received.
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ACRIM
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Nothing received.
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PEM
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***** ALL PEM COMMUNICATION SHOULD NOW BE THROUGH THE PEM2K:: NODE *****
The PEM team reports that the PEM:: node computer has failed and has
been taken off line. PEM:: appears to have hardware problems that take the
system down every few hours. Automatic transfer NRT tests to PEM2K have
succeed however the NRT files have to be verified against those captured by
PEM to confirm the NRT process is correct.
PEM/AXIS was activated in its half power mode on June 3 and deactivated
on June 4. At the current time, AXIS is not generating energy deposition.
SwRI is looking into this. Tests of AXIS production code on the rehost
computer are continuing.
At the present time, PEM energy deposition from its spectrometers is not
being generated. Recent data configuration changes have affected PEM software
causing multiple failures. These failures are being reviewed by the PEM team.
In order to correct for new telemetry requirements, PEM will need to update
processing code with a patch delivery. The delivery patch may include changes
which would allow the PEM software to execute on a DEC Alpha machine. GSFC is
helping PEM with some DEC Alpha particulars which have caused PEM level 3
code to fail on DEC Alpha machines (software below level 3 executes on the
DEC Alpha).
Updated HEPS calibration parameters have been finalized and are ready for
delivery. Updated MEPS quality calibration files have been finalized and are
ready for delivery. Level 3 software errors, discovered by Dr. Dean Pesnell,
have been fixed; his suggestions have been incorporated with in the PEM
production code. Both updated HEPS and MEPS calibration data, along with the
Level 3 code changes, will influence the in-situ energy deposition predictions,
so new versions of PEM energy deposition Level 3 files will be generated.
*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 participated with representatives of ACRIM and
the FOT in a telecon meeting on 11 June 2001 held to
discuss the ACRIM II anomaly which occurred in May.
The planned schedule for UARS instrument operations until
the yaw maneuver on 8 August has been distributed. Daily
processing of instrument Daily Activity Plans continues
with no problems.
***********
CDHF
***********
- DAAC DATA:
- CLAES Version 9 data created in July, 1999 has been loaded into the
DAAC Transfer Tables. DAAC has been notified.
- UARS CDHF REHOST:
- SUSIM 7.2 software was reinstalled on the rehost system (25-MAY-2001)
to allow assess to the new version of UOAS (CDS_VIEW_VEC_CHECK).
SUSIM has suceesfully validated these days and has reported that
they contain valid non-sero TANGENT_PT_ALT values.
***********
FOT
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REPORTING PERIOD
This report covers 02 June 2001 (Orbit 53160, GMT Day 153) through 08 June 2001
(Orbit 53265, GMT Day 159).
SPACECRAFT OPERATION
The observatory is now in Reverse Flight (Northern Hemisphere viewing) and is
performing nominally under two-battery operations. The instrument operational
changes were:
INSTRUMENT OPERATIONAL CHANGES
Instrument Time Orbit Comment
SOLSTICE 153/0015 53161 Power ON
SUSIM 153/0355 53163 Power ON (start)
SUSIM 154/1115 53182 Power ON (continued)
SUSIM 154/1213 53183 Power ON (complete)
PEM 154/1358 53184 AXIS 1 ON (started)
PEM 154/1438 53185 AXIS 1 ON (complete)
ACRIM 154/1731 53186 Power ON
PEM 155/2344 53205 Power OFF AXIS
HALOE 156/0018 53205 Power ON
HALOE 156/0536 53209 Power ON (complete)
The beta angle ranged between the angles of 10.0 degrees to 26.7 degrees for
this report period. The beta angle is now increasing towards a maximum angle
of 34 degrees on 14 June 2001 (DOY 165).
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 23.8 V end-of-night (EON) load bus voltage. Battery
temperatures are stable with a temperature delta between Battery 2 and Battery
3 of 1.9 to 2.2 degrees C. Additional battery performance data for each
battery on 1 June 2001 and 8 June 2001 are provided in Appendix D.
The clock error ranged from Ð12.0 to 11.7 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 = 15
¥ SOLSTICE = 01
¥ SUSIM = 03
¥ PEM = 04
¥ ACRIM = 01
¥ HALOE = 02
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
¥ FOT = 07
¥ SOLSTICE = 01
Four (4) Anomaly Reports remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
· Transponder A: 00/316 - 2287.496493
· Transponder B: 01/119 - 2287.499116
GROUND SYSTEM OPERATION
Seven (7) operational support problems occurred this period. Anomaly Reports
are included in Appendix E.
The data loss calculations supplied by Data Capture Facility (DCF) from mission
start through UTC Day 01/158 show the observatory data loss to be 301 hours, 02
minutes, 12.728 seconds. This shows a loss of 01 minutes and 55.680 seconds
since the last report period. This is a 0.39 percent data loss, which equals a
99.61 percent data capture for the mission.
The increase of 01 minutes and 55.680 seconds occurred over three (3) days:
· 16.512 seconds on Day 152 due to a Data Hit.
· 15.040 seconds on Day 153 due to a Data Hit.
· 1 minutes and 24.128 seconds on Day 154 due to a Late AOS.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The FOT continues to fine-tune the TAM alignment by loading new alignment
matrices. A new alignment is required for the reverse flight direction. This
is a slow process and it will take many alignments to lock in on the most
accurate solution.
An instrument anomaly was experienced on 05 May 2001. The instrument involved
was the ACRIM II instrument. All ACRIM telemetry for currents and voltages all
dropped to zero values suddenly. The ACRIM team in coordination with the
UARSFOT is conducting analysis and command tests to determine the cause of the
anomaly. Preliminary analysis shows that the anomaly was caused due to failed
circuitry in the ACRIM electronics box.
MEETINGS
The FOT attended a UARS TAC RS Meeting on Wednesday, June 04, 2001.
The FOT attended a 3TDRS Flight Software Review Meeting on Thursday, June 05,
2001.
The FOT attended a ACRIM Anomaly Investigation Meeting on Thursday, June 05,
2001.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 28 June 2001 (DOY 179). This maneuver
will be a Reverse to Forward Flight maneuver (Southern Hemisphere viewing).
Attachments: Appendix A, Real-time Commands 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 08 June 2001
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
53161 153/0015 01-357 SOLSTICE Power ON
53163 153/0355 01-358 SUSIM Power ON (start)
53163 153/0420 01-359 OBC Clk Adj fr 20.6 to 0.00 msec/day
53174 153/2235 01-360 OBC Clk Adj fr 0.0 to -20.6 msec/day
53182 154/1115 01-358 SUSIM Power ON (continued)
53183 154/1213 01-358 SUSIM Power ON (complete)
53184 154/1358 01-361 PEM AXIS 1 ON (started)
53185 154/1438 01-361 PEM AXIS 1 ON (complete)
53186 154/1624 01-362 PEM ZEPS,HEPS DAY-ONLY
53186 154/1731 01-363 ACRIM Power ON *
53193 155/0349 01-364 OBC Clk Adj fr -20.6 to 0.00 msec/day
53200 155/1555 01-365 NBTR Playback
53202 155/1810 01-366 NBTR NOOPS D156
53205 155/2344 01-367 PEM Power OFF AXIS
53205 156/0018 01-368 HALOE Power ON
53209 156/0536 01-369 HALOE Power ON complete
53210 156/0715 01-366 NBTR NOOPS D156
53225 157/0754 01-370 NBTR NOOPS D157
52230 157/1551 01-371 OBC TAM Alignment
53233 157/1958 01-372 NBTR NOOPS D158
53240 158/0716 01-372 NBTR NOOPS D158
53247 158/1816 01-373 NBTR NOOPS D159
53253 159/0356 01-374 OBC Clk Adj fr 0.00 to 20.6 msec/day
53254 159/0538 01-373 NBTR NOOPS D159
53259 159/1409 01-375 TAM/OBC TAM Alignment
53261 159/1735 01-373 NBTR NOOPS D159
_______________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 08 June 2001
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 08 June 2001
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
53163 153/0427 Clk Adj from 20.6 to 0.00 msec/day
53174 153/2240 Clk Adj from 0.0 to -20.6 msec/day
53193 155/0351 Clk Adj from -20.6 to 0.00 msec/day
53253 159/0400 Clk Adj from 0.00 to 20.6 msec/day
_______________________________________________________________________________
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 08 June 2001
01 June 2001 - GMT Day 152 Beta = 6.9 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 +728.0/+728.0 -3.05/-4.62 +0.0/+0.0 12.0 0.000 0.0
2 +22.4/-95.2 +5.47/+4.51 +28.8/-13.2 24.5 1.030 20.9
3 +22.4/-78.4 +4.51/+3.23 +28.0/-13.6 24.5 1.020 20.5
08 June 2001 - GMT Day 159 Beta = 26.7 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 +728.0/+728.0 -3.05/-4.31 +0.0/+0.0 12.0 0.000 0.0
2 +11.2/-112.0 +6.44/+4.51 +28.8/-15.2 23.8 1.030 21.9
3 +22.4/-67.2 +5.47/+3.23 +28.4/-16.0 23.8 1.020 21.6
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
---- ---- ---------
-no changes V/T 5
_______________________________________________________________________________
APPENDIX E
UARS ANOMALY REPORTS
Week ending 08 June 2001
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-032 FOT 53189 154/2137 14170 Generic Late Acquisition
01-032 FOT 53200 155/1439 14170 Generic Late Acquisition
01-033 FOT 53222 157/0220 N/A /CDEL function not working
01-034 FOT 53225 157/0754 N/A Unable to dump ATC
01-035 FOT 53232 157/1916 N/A AP 7 Crashed
01-036 SOLSTICE 53263 159/2058 N/A SOLSTICE Load Problem
01-037 FOT 53292 161/1820 N/A Unable to load ATC
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-022 ACRIM 52709 122/2140 N/A Red Low voltage alert
01-024 ACRIM 52753 125/2045 N/A ACRIM Alerts - Power Off
01-035 FOT 53232 157/1916 N/A AP 7 Crashed
01-036 SOLSTICE 53263 159/2058 N/A SOLSTICE Load Problem
ANOMALY INVESTIGATION REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
01-032 FOT see list June 01 14170 Generic Late Acquisition
01-033 FOT 53222 157/0220 N/A /CDEL function not working
01-034 FOT 53225 157/0754 N/A Unable to dump ATC
01-037 FOT 53292 161/1820 N/A Unable to load ATC
SEVNTFW01/23