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UARS WEEKLY STATUS REPORT - 22 OCT 1999
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SOLSTICE
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SOLSTICE continues to operate normally, collecting solar data on all
available orbital tracking periods and stellar calibration observations,
whenever possible.
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SUSIM
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SUSIM successfully gathered its normal solar, offset and occultation
data this past week without apparent problems.
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ACRIM
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Nothing received.
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PEM
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The PEM/AXIS activated between October 3 and October 20. While AXIS
was active, it produced energy deposition from 16 pixels based on precipitating
electrons derived from measured X-ray fluxes. AXIS was in its full power mode
during this time period.
The PEM spectrometers continue to be active under PMON control. While
under PMON control, the PEM instrument computed energy deposition from its
particle spectrometers.
The FOT and the PEM team are have completed updating the PEM activation
sequence which effects the PEM/HEPS (> 30 keV particles).
PEM PMON activation is set for the beginning of power orbit day. The beginning of
power orbit day is defined as when:
array current greater than 5 amps, and
array voltage greater than 53.5 volts, and
any battery current greater than 2.0 amps
The end of power orbit day (PEM deactivation) is defined as when:
time in power orbit day greater than 4 minutes, and
array current less than 9 amps, and
all battery currents less than 0.2 amps
Power orbit day periods vary depending upon beta angle:
about 39-40 minutes at yaw
about 50-51 minutes at max beta
Current activation takes about 6 min for full activation. During the
activation sequence, various components of PEM become active at all different
times, beginning with the PEM magnetometer (at about on activation time) and
ending with the HEPS-2 components (6 min later).
Thanks to Dimitrios Mantziaras of the FOT for assisting PEM with the activation
sequence timing and getting this task completed.
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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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Routine processing of instrument Daily Activity Plans continues
with no problems. The MPG continues to assist the Project
Scientist with the scheduling of instrument operations.
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CDHF
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The CDHF processed current day data through level 3 for all active
instruments. Additionally, CDHF personnel reprocessed: (R)= Requested
(C) = Complete, (F)= Failed (L) = Days remaining to reprocess.
13 days CLA (7.0) PROD (L1-L3) (473R-320C-17F=136L)
26 days GPI (4.05) PROD (CLAES L3B) (222R-196C-1F=25L)
2 days HAL (4.82) PROD (L1-L3)(TEST) (2R-2C=0L)
The CDHF has successfully tested HALOE V4.82 formal software delivery
on CDHF6 and CDHF7. We plan on testing WINDII V5.11A formal software delivery
next week.
CDHF REHOST:
- UARS CDHF has been working on moving utilities and command files to
rehost system to aid in the production processing and data monitoring.
- HALOE V4.82 formal software delivery has been installed on the rehost
system. We are preparing to start testing the software this week:
- The CDHF continues to perform reboots of CDHFA/B as scheduled on
Wednesdays to check system settings, logicals, etc at startup as changes
continue to be made on these systems.
DAAC DATA:
Data created in the month of August 1999 for HALOE, PEM, NMC, and UKMO
has been previewed. SUSIM Level 3BS (output V20) data continues to
be previewed and loaded into the DAAC Transfer Tables. DAAC
has been notified.
CDHF pending software upgrades: none
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FOT
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REPORTING PERIOD
This report covers 9 October, 1999 (Orbit 44136, GMT Day 282) through 15
October 1999 (Orbit 44240, GMT Day 288).
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
WINDII 285/0237 44182 On
HALOE 286/1130 44203 Off
HALOE 286/1314 44204 On
HRDI 286/1532 44205 Restart
The beta angle ranged between the angles of 45.9 degrees to 46.8 degrees for
this report period. The beta angle is now decreasing toward a minimum angle of
0 degrees on 29 October 1999 (DOY 302).
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 1.0 to 1.3 degrees C. Additional battery performance data for each
battery on 08 October 1999 and 15 October 1999 are provided in Appendix D.
The clock error ranged from -11.1 to 11.0 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.
% ALERTS = 00
% OUT-OF-LIMITS = 00
The following real-time command sheets were executed for the listed operational
element(s) during this report period (see Appendix A).
% PEM = 01
% WINDII = 01
% HARDI = 01
% HALOE = 03
% FOT = 03
UARS Anomaly Reports initiated during this report period are listed in Appendix
E and summarized below.
% FOT = 03
One (1) Anomaly Reports remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
% Transponder A: 99/263 - 2287.496947
% Transponder B: 99/265 - 2287.498700
GROUND SYSTEM OPERATION
Two (2) 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 99/288 show the observatory data loss to be 24 hours, 55
minutes, 40.404 seconds (an increase of 0.384 seconds since the last report
period). This is a 0.0353 percent data loss which equals a 99.9647 percent
data capture for the mission.
The increase of 3.296 seconds occurred over three (3) days:
7 2.432 seconds on Day 283 due to an Data hit.
7 0.352 seconds on Day 284 due to an Data hit.
7 0.512 seconds on Day 287 due to an Data hit.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
The Leonid plan was completed by updating the previous years plan without the
use of the Earth Sensor. After consulting with FDF and NOAA analysts, the
impact by the Leonids to UARS is believed to be significantly less substantial
than last year. This opinion was presented at the UARS monthly and mutual
concurrence was established to make Leonid plans without the use of the Earth
Sensor.
The timing on the PEM instrument was fixed this week. Everything on our end
appears to have executed as planned. We are awaiting from the PEM instrument
team after the data has been looked at on their end.
YEAR 2000 OPERABILITY SUPPORT
The UARS FOT plans to take part an NCC Y2K test planned for Tuesday of next
week. The UARS simulator may be configured to send some test blocks.
MEETINGS
None.
FUTURE SIGNIFICANT EVENTS
A second meeting to discuss the UARS Safehold configuration and concerns for
the MPS and its batteries is planned for Friday, November 5th. This meeting
will be a closed meeting with only the FOT and specialized engineering support
attending.
PEM requested to have the timing in their turn on sequence tightened up in yet
another area. This is expected to be accomplished within the next few weeks.
PERSONNEL CHANGES
None.
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 15 October 1999
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
44156 283/0919 99-334 OBC Clk Adj fr 20.6 to 0.00 msec/day
44182 285/0237 99-335 WINDII Power ON
44182 285/0237 99-336 OBC Clk Adj fr 0.00 to 20.6 msec/day
44203 286/1130 99-337 HALOE Power OFF
44204 286/1314 99-338 HALOE Power ON
44205 286/1532 99-339 HRDI Restart
44205 286/1532 99-340 HALOE Sunrise update
44219 287/1311 99-341 OBC Clk Adj fr 20.6 to 0.00 msec/day
44223 287/1945 99-342 PEM Update PMON Sequence
_______________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 15 October 1999
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
No Alerts to report this report period.
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
No Alerts to report this report period.
_______________________________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 15 October 1999
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
44156 283/09:25 (10 Oct 99) from 20.6 to 00.0 msec/day
44182 285/02:44 (12 Oct 99) from 00.0 to 20.6 msec/day
44219 287/13:15 (14 Oct 99) from 20.6 to 00.0 msec/day
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 15 October 1999
08 Oct 1999 - GMT Day 281 Beta = 45.9 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 -112.0/-134.4 -3.05/-3.99 +0.0/+0.0 16.5 0.000 0.0
2 +22.4/-33.6 +5.79/+4.51 +27.6/-15.6 25.3 1.022 21.4
3 +22.4/-44.8 +4.83/+3.87 +27.2/-15.2 25.1 1.025 21.0
15 Oct 1999 - GMT Day 288 Beta = 46.8 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 -106.4/-128.8 -3.05/-4.31 +0.0/+0.0 16.5 0.000 0.0
2 +11.2/-44.8 +5.47/+4.51 +27.6/-15.2 25.1 1.023 21.1
3 +22.4/-33.6 +4.51/+3.23 +27.2/-16.0 25.1 1.024 20.8
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---- ----------
no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 15 October 1999
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-064 FOT 44135 10/8-9/99 N/A HRDI Cal Lamp Errors
99-065 FOT 44179 284/2216 N/A TAC 8 Crashed
99-066 FOT 44222 287/1815 N/A AP CRASH
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-062 FOT 44085 278/1425 21435 TAC 8 Crashed
99-063 FOT 44088 278/2059 N/A TAC 8 Crashed
99-065 FOT 44179 284/2216 N/A TAC 8 Crashed
99-066 FOT 44222 287/1815 N/A AP CRASH
ANOMALY INVESTIGATION REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-064 FOT 44135 10/8-9/99 N/A HRDI Cal Lamp Errors
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-064 FOT 44135 10/8-9/99 N/A HRDI Cal Lamp Errors
SEVNTFW99/42