********************************************************************
UARS WEEKLY STATUS REPORT - 29 OCT 1999
********************************************************************
***********
SOLSTICE
***********
SOLSTICE continues to operate normally, collecting solar data on all
available orbital tracking periods and stellar calibration observations,
whenever possible.
We have begun a mission-reprocessing of a new version (14) of Level 2 and
Level 3A data products, under RSS services (non-catalogued) on CDHF6. These
test products will be analyzed and validated at the SOLSTICE RAC. This
reprocessing should be completed by the end of November. Then, following
the completion of the CDHF re-host effort and the solution of the SOLSTICE/
UCSS Services "Wallclock Time" problem, we plan a full mission reprocessing
under CDHF production services.
***********
SUSIM
***********
Nothing received.
***********
ACRIM
***********
Nothing received.
***********
PEM
***********
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 (approximately at 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.
***********
HALOE
***********
HALOE continues successful operations with all engineering parameters
within its nominal operating region. HALOE was commanded into survival
mode on October 26, 1999 at 23:00 GMT in preparation for the yaw. HALOE is
scheduled to be turned on beginning of day November 1st.
***********
MLS
***********
Nothing received.
***********
HRDI
***********
Nothing received.
***********
WINDII
***********
Nothing received.
***********
MPG
***********
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.
***********
CDHF
***********
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.
17 days CLA (7.0) PROD (L1-L3) (476R-337C-17F=122L)
30 days GPI (4.05) PROD (CLAES L3B) (246R-226C-1F=19L)
1 days HAL (4.81) PROD (L1-L3) (1R-1C=0L)
HALOE has successfully validated the V4.82 testing on the current system and
has requested PC to promote the software to production mode. HALOE V4.82
promoted.
CDHF plans on testing WINDII V5.11A formal software delivery.
UARS CDHF REHOST:
The CDHF is testing HALOE V4.82 on the rehost system.
The Bi-hourly Alpha 4000 Checklist has been made available for daily
operational monitoring of the Alpha Cluster. Rehost procedures continue
to be drafted.
DAAC DATA:
- DAAC data through July 1999 is available to the User Community for
HALOE, PEM, NMC, and UKMO.
- Data created in the month of November 1998 has been loaded into the DAAC
Transfer Tables for SUSIM LEVEL 3BS (Output 20). DAAC has been notified.
- Data created in the month of December 1998 has been previewed for
SUSIM LEVEL 3BS (Output 20).
***********
FOT
***********
REPORTING PERIOD
This report covers 16 October, 1999 (Orbit 44241, GMT Day 289) through 22
October 1999 (Orbit 44345, GMT Day 295).
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
PEM 293/2345 44315 AXIS Off
The beta angle ranged between the angles of 46.8 degrees to 27.0 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 15 October 1999 and 22 October 1999 are provided in Appendix D.
The clock error ranged from 10.1 to -10.9 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 = 01
The following real-time command sheets were executed for the listed operational
element(s) during this report period (see Appendix A).
% PEM = 01
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
Three (3) 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 99/294 show the observatory data loss to be 24 hours, 55
minutes, 54.836 seconds (an increase of 0.384 seconds since the last report
period). This is a 0.0352 percent data loss which equals a 99.9648 percent
data capture for the mission.
The increase of 14.432 seconds occurred over three (3) days:
7 1.504 seconds on Day 290 due to a Data hit.
7 9.440 seconds on Day 292 due to DRC not covered and Data hit.
7 3.488 seconds on Day 294 due to degraded TR dump.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
This week we received word that the PEM timing changes made last week worked
well and the PEM team is pleased with the results.
YEAR 2000 OPERABILITY SUPPORT
The FOT participated in the NCC Y2K Engineering Interface Test on 19 October.
The test consisted of two phases: 1) TDRS Scheduling, and 2) Real-time event
simulation. In both phases, the NCC simulator was set up to simulate the 1999-
to-2000 year rollover. For the Real-time event portion of the test, we were
able to send GCMRs and receive ODMs or UPDs automatically or by request. We
were also able to receive Comm tests per request but were not able to receive
them when they were generated by NCC directly. For the scheduling portion of
the test, the FOT sent in Schedule Add Requests and Schedule Delete Requests
for both the active and forecast scheduling periods, using the back-up User
Planning System.
The 2000-2001 roll-over scenario was retested. All went well just like the
previous test. We were able to send test commands including OBC dumps, Partial
table loads, GENASCII commands, NOOPs, ATC loads with time tags and ATC safety
loads.
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 22 October 1999
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
44249 289/1309 99-344 OBC Clk Adj fr 0.00 to 20.6 msec/day
44277 291/1029 99-344 OBC Clk Adj fr 20.6 to 0.00 msec/day
44315 293/2345 99-345 PEM PEM Axis Power OFF
44319 294/0625 99-346 OBC Clk Adj fr 0.00 to 20.6 msec/day
44339 295/1326 99-347 OBC Clk Adj fr 20.6 to 0.00 msec/day
___________________________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 22 October 1999
The following Out-Of-Limits occurrences were detected:
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
SOSGTEVLTG Y-HI SOLSTICE G-TUBE VOLTAGE 44327
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 22 October 1999
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
44249 289/13:09 (16 Oct 99) from 00.0 to 20.6 msec/day
44277 291/10:29 (18 Oct 99) from 20.6 to 00.0 msec/day
44319 294/06:25 (21 Oct 99) from 00.0 to 20.6 msec/day
44339 295/13:26 (22 Oct 99) from 20.6 to 00.0 msec/day
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 22 October 1999
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
22 Oct 1999 - GMT Day 295 Beta = 27.0 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 -100.8/-123.2 -3.05/-3.99 +0.0/+0.0 16.3 0.000 0.0
2 +16.8/-44.8 +6.11/+5.15 +32.0/-15.2 24.6 1.022 21.9
3 +16.8/-106.4 +5.15/+3.87 +31.2/-16.0 24.5 1.022 21.7
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- ---------- ----------
no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 22 October 1999
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-067 FOT 44275 291/0759 N/A TAC-4 Crashed
99-068 FOT 44280 291/1455 N/A TAC-6 Crashed
99-069 FOT 44312 99/1904 N/A TAC-8 Crashed
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-067 FOT 44275 291/0759 N/A TAC-4 Crashed
99-068 FOT 44280 291/1455 N/A TAC-6 Crashed
99-069 FOT 44312 99/1904 N/A TAC-8 Crashed
ANOMALY INVESTIGATION REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
No new investigation reports generated.
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
SEVNTFW99/43