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UARS WEEKLY STATUS REPORT - 25 JUN 1999
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SOLSTICE
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SOLSTICE began one week of day only operations on Wednesday, June 23
(99174).
Normal operations will resume at the beginning of day 99181 (Wednesday,
June 30).
Full solar data sets are retrieved during this time, however no stellar
calibration observations are possible.
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SUSIM
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Nothing received.
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ACRIM
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ACRIM II continues to perform nominally. Total Solar Irradiance data products
have been updated on the http://www.acrim.com web page to include all of
CY1998 daily mean results.
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PEM
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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 completing close-out documentation on
the HEPS Energy Processor trouble; however progress has been hampered
with the departure of Peter Thomas.
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HALOE
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HALOE continues successful operations with all engineering parameters
within nominal operating range. HALOE science data products are of
excellent quality.
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MLS
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MLS was reactivated successfully on June 23 and is scheduled to operate
through June 29.
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HRDI
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Nothing received.
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WINDII
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WINDII is next scheduled for operation June 30 to July 9,
which will include PMC observations in the northern
hemisphere.
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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) (475R-61C-8F=406L)
0 days GPI (4.05) PROD (MLS V5 3AL) (39R-0C-1F=39L)
52 days WIN (5.11) PROD (L1-L3) (1540R-787C-5F=748L)
The CDHF continues to run GPI software against HRDI V4.4 3AL data.
DAAC data for the month of April 1999 has been loaded into the DAAC
Transfer Tables for HALOE, NMC, PEM, and UKMO.
We will load May 1999 current day DAAC data in July 1999.
CDHF pending software upgrades: DEC AXP Fortran 6.5, DEC AXP OPEN
VMS 6.2, OpenIngres.
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FOT
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REPORTING PERIOD
This report covers 12 June 1999 (Orbit 42353 , GMT Day 163) through 18 June
(GMT Day 169).
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
PEM 164/0042 42369 AXIS-1 On
HALOE 166/1330 42407 On
HRDI 168/0439 42431 Off
PEM 168/2354 42443 AXIS-1 Off
HRDI 169/0057 42444 On
The beta angle ranged between the angles of 0.8 degrees to 22.7 degrees for
this report period. The beta angle is now increasing toward a maximum
angle of 34 degrees on 26 June 1999 (DOY 177).
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 23.5 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 11 June 1999 and 18 June 1999 are provided in Appendix
D.
The clock error ranged from -8.0 to 0.2 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 = 03
The following real-time command sheets were executed for the listed
operational element(s) during this report period (see Appendix A).
% HRDI 03
% HALOE 02
% PEM 02
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
% FOT 00
No Anomaly Reports remained OPEN at the end of this report period (see
Appendix E).
TRANSPONDER FREQUENCIES:
Transponder A: 99/130 - 2287.496913
Transponder B: 99/151 - 2287.499087
GROUND SYSTEM OPERATION
No 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 99/119 show the observatory data loss to be
24 hours, 13 minutes, 08.340 seconds (an increase of 2.944 seconds since
the last report period). This is a 0.0357 percent data loss which equals a
99.9643 percent data capture for the mission.
The increase of 2.944 seconds occurred over two (2) days:
7 1.088 seconds on Day 165 due to data hits,
7 1.856 seconds on Day 166 due to data hits.
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
FOT personnel are supporting the IMOC (SCS-21) development effort. The
current work is a continuation of the SCS-21 UARS implementation effort
done last year which culminated in a level 1 demonstration.
The FOT continues to investigate the feasibility of a new PMON action to
change battery V/T curves based on loading to mitigate battery risks in sun
pointing safehold.
YEAR 2000 OPERABILITY SUPPORT
The end-to-end testing has been delayed until a new FORMATS software
release can be made to accommodate the special Y2K planning aids.
MEETINGS
FOT attended the last weekly IMOC meeting on Wednesday 16 June 1999.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw Around Maneuver (reverse-to-forward) is scheduled for 10
July 1999 (DOY 191).
PERSONNEL CHANGES
The FOT would like to welcome Ron Smilek to UARS. Ron will be taking over
for John Speer as the technical lead.
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 18 June 1999
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ -------
42369 164/0042 99-201 PEM AXIS 1 ON
42407 166/1330 99-202 HALOE Power ON Pt-1
42410 166/1944 99-203 HALOE Power ON Pt-2
42431 168/0439 99-203 HRDI Power OFF
42443 168/2354 99-204 HRDI Microload to correct logic error
42443 168/2354 99-205 PEM AXIS 1 OFF
42444 169/0057 99-206 HRDI Power ON
_______________________________________________________________
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 18 June 1999
MNEMONIC STATE DESCRIPTION ORBITS
--------- ----- ------------ ------
PECUPRITE R-HI PCU Primary Current Mon 42373
HRIFESURVTMP Y-HI HRDI SURVIVAL HTR TMP 42433
HRPSEQBIMON Y-HI HRDI PSE Quiet Bus Current Mon 42442,47-8
The following ALERT occurrences were detected:
MNEMONIC DESCRIPTION ORBITS
--------- ------------ ------
None this report period
_______________________________________________________________
APPENDIX C
CLOCK & SOLAR ARRAY RATE CORRECTIONS
Week ending 18 June 1999
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ---- -----------------
-No clock adjusts for this report period
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 18 June 1999
11 June 1999 - GMT Day 162 Beta = 0.8 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 -95.2/-117.6 -3.05/-4.94 +0.0/ +0.0 16.5 0.000 0.0
2 +67.2/-5.6 +5.47/+4.19 +30.4/-15.2 23.8 1.015 21.6
3 +28.0/-39.2 +4.51/+2.92 +29.6/-16.0 23.8 1.015 21.3
18 June 1999 - GMT Day 169 Beta = 22.7 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 -95.2/-123.2 -2.73/-3.99 +0.0/ +0.0 16.5 0.000 0.0
2 +56.0/-5.6 +7.09/+5.15 +30.4/-15.2 23.8 1.021 22.7
3 +22.4/-50.4 +5.79/+4.19 +29.6/-16.0 23.7 1.024 22.5
V/T LEVEL CHANGES
ORB# TIME LVL FR-TO
----- -------- ----------
no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 18 June 1999
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
------ ------ ----- ---- --- -----------------
99-029 FOT 42317 160/1405 20954 Late Acq. PTP reset
ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------- ------ ----- ---- --- -----------------
None this report period
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
99-028 FOT see list June 99 14170 Generic Late Acq
SEVNTFW99/25