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UARS WEEKLY STATUS REPORT - 30 Nov 2001
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Please send future UARS Weekly Status Report submissions
to UMPGAL::STAT or "stat@umpgal.gsfc.nasa.gov"
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SOLSTICE
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SOLSTICE performed only daylight operations on Nov 26th and 27th in
support of the yaw maneuver. Otherwise, SOLSTICE continues to operate
normally, taking solar data on all available orbital tracking periods
and stellar calibration observations whenever possible. We continue to
gather enough data to meet all the SOLSTICE science objectives during
this period of reduced tape recorder operations.
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SUSIM
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SUSIM completed daily mid resolution and MgII solar scans during
periods of predicted UARS telemetry.
We are now beta testing the remaining software components that
will allow the processing of the SUSIM data from level 1 to
level 3 on the SUSIM RAC.
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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 boom instruments were activated on 2001303 at about 22 UT in
full operational mode and were deactivated 2001316. PEM began daylight
operations on 2001333 and the PEM/AXIS-1 was activated also on 2001333.
Verification of PACOR-A files is complete and verified. Binaries were
not the same from PACOR-A as from CDHF so these data files were processed
to science data and the science data was compared. As suspected, the version
number field contained a different value which caused the binaries to differ.
PEM does not use Quicklook data; however, PEM has used NRT data from
the CDHF to verify instrument operations in the past. PEM assumes that NRT
data will no longer be available...(Correct?)
PEM performed tests of NMC data files from both the CDHF and NOAA. NMC
data files from both systems were captured and read. PEM is now capturing
NMC data directly from the NOAA web site. An automated-cron unix c-shell script
is available from PEM if it can be of use to others. For a copy, contact:
rudy@pemrac.space.swri.edu or PEM2K::RUDY.
An outstanding question from PEM is the UARS Orbit and Attitude. Some
discussion has taken place about the UARS ORBIT data but there has been no
indication on how UARS attitude data is being distributed to the experimenters.
In addition, PEM uses UARS OA Services-UOAS extensively and that software has
not been made available. It is unclear as to how attitude information is
to be determined.
*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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HALOE is scheduled to be powered on beginning-of-day 335 or tonight at
approx. 7:00pm EST. HALOE engineering parameters are within nominal
operation and all science channels are with expected operating values
during the last operational period ending at end-of-day November 22,
2001 Science data processing is complete through the end of October 2001.
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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 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 17 November 2001 (Orbit 55682, GMT Day 321) through
23 November 2001 (Orbit 55786, GMT Day 327).
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
HALOE 322/0810 55702 Power OFF
HALOE 322/2005 55709 Power ON
ACRIM 323/1425 55721 Power ON
HALOE 326/2338 55771 Power OFF
PEM (Z/H) 327/2300 55786 Power OFF
The beta angle ranged between the angles of 38.6 degrees to 13.9 degrees
for this report period. The beta angle is now increasing towards a
minimum angle of 2 degrees on 26 November 2001 (DOY 330).
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 1.3 to 1.9 degrees C. Additional
battery performance data for each battery on 16 November 2001 and 23
November 2001 are provided in Appendix D.
The clock error ranged from -10.1 to -0.5 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.
95 OUT-OF-LIMITS 3D 00
95 ALERTS 3D 00
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
95 FOT 3D 15
95 PEM 3D 1
95 HALO 3D 3
95 ACRIM 3D 1
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
95 None this report period.
One (1) Anomaly Report remained OPEN at the end of this report period
(see Appendix E).
TRANSPONDER FREQUENCIES:
* Transponder A: 00/316 - 2287.496493
* Transponder B: 01/286 - 2287.498613
GROUND SYSTEM OPERATION
Zero (0) 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). This service should resume soon.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The FOT and software developers located the cause of the problems on the
new TAC system. A temporary patch was installed for testing. Testing
showed that the patch resolved the urgent DRs. The TAC developers are
now in the process of fixing the software permanently and will delivery
a new release sometime early next week. This should allow the new TACs
to go to ORR and subsequently released for operations.
MEETINGS
The FOT attended a UARS OBSTF Meeting on Monday, November 19, 2001.
The FOT attended a UARS PACOR-A Meeting on Tuesday, November 20, 2001.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 26 November 2001 (DOY 330).
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 23 November 2001
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
55685 321/0626 01-677 NBTR noops D321
55693 321/1748 01-677 NBTR NOOPS D321
55693 321/1823 01-678 NBTR NOOPS D322
55701 322/0626 01-678 NBTR D 322 noops
55702 322/0810 01-679 HALOE Power OFF
55709 322/2005 01-680 HALOE Power ON
55709 322/2005 01-678 NBTR NOOPS D322
55716 323/0626 01-681 NBTR D 323 NOOPS
55721 323/1425 01-682 ACRIM Power ON
55723 323/1750 01-681 NBTR NOOPS D323
55723 323/1827 01-683 NBTR NOOPS D324
55731 324/0627 01-683 NBTR D 324 NOOPS
55738 324/1750 01-683 NBTR D 324 NOOPS
55746 325/0626 01-684 NBTR D 325 NOOPS
55753 325/1827 01-685 NBTR D 326 NOOPS
55761 326/0627 01-685 NBTR D 326 NOOPS
55771 326/2338 01-686 HALOE Power OFF
55777 327/0812 01-687 NBTR NBTR PBK
55779 327/1142 01-688 0BC Clk Adj 0.00 to -20.6 msec/day
55786 327/2300 01-689 PEM (Z/H) Power OFF
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 23 November 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 23 November 2001
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
55779 327/1142 Clk Adj 0.00 to -20.6 msec/day
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 23 November 2001
16 November 2001 - GMT Day 320 Beta 3D 42.8 deg, SA Pos 3D 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 -3.77/-4.38 +0.0/ -0.0 10.7 0.000 0.0
2 +00.0/ -72.8 +5.47/+4.48 +28.4/-14.4 25.8 1.050 20.4
3 +22.4/ -22.4 +4.48/+3.17 +27.2/-14.4 25.8 1.040 20.0
23 November 2001 - GMT Day 327 Beta 3D 13.9 deg, SA Pos 3D 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 -3.77/-4.69 +0.0/ -0.0 10.7 0.000 0.0
2 +00.0/ -33.6 +4.48/+4.17 +28.8/-13.6 26.2 1.030 19.1
3 +22.4/ -22.4 +3.17/+2.20 +28.0/-13.6 26.2 1.030 18.6
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---- ---------
-no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 23 November 2001
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
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
------ ------ ----- ---- --- -----------------
01-69 FOT see list Nov 01 14170 Generic Late Acquisition
SEVNTFW01/47