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UARS WEEKLY STATUS REPORT - 14 OCT 2005
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SOLSTICE
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Nothing received.
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SUSIM
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Nothing received.
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PEM
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HEPSA data files are version 2. Currently, HEPSA data between 1991274
and 2004273 has been reprocessed and archived at the GSFC DAAC. HEPSA data
between 2004274 and 2005099 has been processed and is waiting for archival
at the DAAC.
MEPS data files are version 1. Processed MEPS data files at the DAAC
archive are between 1991274 and 2004259. MEPS data between 2004260 and
2005099 has been processed and is waiting for DAAC archival.
HEPSB data files are version 1. HEPSB data files between 1991274 and
1991366 have been processed and are waiting for DAAC archival.
Processing of all PEM DAAC data files has been suspended until the DAAC
catches up with archiving all processed data files. It was discovered
that DAAC changed the access IP node. This caused failure accessing SwRI
to retrieve Level 2 data. A change order at SwRI has been completed.
Tests of the interface can now be conducted. The DAAC has successfully been
able to access SwRI again.
Checks on the PEM data availability through the DAAC have been conducted
by SwRI. These tests were prompted by a user of PEM data who has had trouble
accessing the PEM data in the DAAC. The documentation link to the PEM HEPSA
Level 2 Document still points to the old version file pem_l2_hepsa_v01.txt
instead of the v02 file for hepsa data. Also, there is no MEPS entry for the
MEPS data set. These problems have been reported to help@daac.gsfc.nasa.gov.
Tests of the AXIS1 data file formats have been successful. The AXIS1
format design has been coded. A test file has been generated. A check
program with processing scripts have also been generated. Example binary
read program is complete and verified. These results have been sent to
the project. Creation of the AXIS1 data documents for DAAC data will
begin shortly.
PEM continues to receive NMC data files from NOAA. No problems have
been encountered since updates have occurred.
The PEM data from the GUVI conjunction periods may be found at
http://wwwpem.space.swri.edu/guvi-pem.html. The additional electron data for
the October and November storms of 2003 has been moved and is now located at
http://climatology.space.swri.edu/uars_fromRudy.html. For those users of
SDDAS, update your UARS Meta data and these data times will appear
with full functionality. Proton data from these storms are now located at
http://climatology.space.swri.edu/UARS_images_from_Rudy_(Apr._2004).html
Requests have been received for storm spectral data. Overview plots were
produced and these plots may be found on the web at
http://climatology.space.swri.edu/UARS_images_postedJune2004.html
for the storms of October 29 of 1991, November 8-9 of 1991, April 6-7 of 2000,
March 31 - April 1 of 2001, April 11-12 of 2001, November 6-7 of 2001, and
November 11-12 of 2001.
PEM has received a request for data from the super storm of November
2004. The Dst value showed sudden commencement early on November 7, 2004
reaching a Dst value of about -380 gamma early on November 8, 2004.
PEM was not active at that time and became active late on November 8, 2004
in day only mode. A second peak of about -280 gamma was observed on November
11, 2004. PEM became active in day-light only mode late on November 8. PEM
survey spectrograms for November 8-18 of 2004 may be found at:
http://climatology.space.swri.edu/UARS_images_fromRudy.html
*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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MPG
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The MPG is participating in the on-going UARS end of mission
planning activities.
The MPG continues to serve as the point-of-contact for UARS
instrument operations in support of the UARS Science 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 01 October 2005 (Orbit 76942, GMT Day 274) through
07 October 2005 (Orbit 77047, GMT Day 280).
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
-NONE THIS REPORT PERIOD
The beta angle ranged between the angles of 58.2 degrees to 61.6
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of -2 degrees on 24 October 2005 (DOY 297).
Spacecraft battery 1, 2, and 3 performance monitoring continues.
Battery 1 remains OFF the charge relay. TMON 45 and 46 are
maintaining the relay operations for battery 2. Battery 2 and Battery
3 are currently maintaining greater than 23.6 V end-of-night (EON)
load bus voltage. Battery temperatures are stable with a temperature
delta between Battery 2 and Battery 3 of 10.9 to 11.5 degrees C.
Additional battery performance data for each battery on 30 September
2005 and 07 October 2005 are provided in Appendix D.
The clock error ranged from 09.9 to -10.3 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 = 12
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 05
Three (3) Anomaly Reports remained OPEN at the end of this report
period (see Appendix E).
GROUND SYSTEM OPERATION
Five (5) 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).
OTHER SIGNIFICANT EVENTS
UARS SATELLITE OPERATIONS
This week the FOT continues to closely monitor the condition of
battery 2 and battery 3. Battery 2 and 3 have not been sharing load
well since the cell failure on battery 2. Battery 3 now carries
almost 90% of the power load while battery 2 provides the remaining
10%. NASA power branch has been providing daily support in monitoring
the UARS battery condition. The FOT has been authorized to disable
all platform and instrument heaters on the SSPP. This will be done at
the earliest available opportunity. The FOT also changed VT levels
from 7 to 6 because of the high approaching high beta. The FOT will
revert back to VT-7 at a future date based on power needs.
The FOT successfully completed two-planned orbit lowering burns this
week. The first orbit lowering burn on 04 October 2005 went extremely
well. The burn started as planned at 277/1709 and ran for 18 minutes.
The calculated duty cycle for the burn was 78.1%. FDF calculated that
perigee was lowered by 38 km at the completion of this burn.
The second orbit lowering burn on 06 October 2005 went as expected.
The burn started as planned at 179/1507 and ran for 18 minutes. The
calculated duty cycle for the burn was 77.7%. FDF calculated that
perigee was lowered by 32.8 km at the completion of this burn.
MEETINGS
The FOT attended a pre-burn CAM meeting on 03 October 2005. The orbit
lowering burn script and procedures were reviewed and approved during
this meeting. FDF also presented their predicted post burn position
and velocity based on the engineering calibration burns done.
The FOT attended a combined post burn de-brief and CAM meeting on 05
October 2005. The FOT and FDF presented their analysis of the 18-
minute burn that occurred on 04 October 2005. The FOT re-sequenced a
few commands in the burn script in order to minimize the time needed
before the burn start time. The FOT now only needs 3 minutes of
commanding time from the start of the pass to be able to fire the
thrusters, and 5 minutes to safe the propulsion module before LOS of
the burn pass.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 24 October 2005 (DOY 297).
This maneuver will be a Reverse to Forward Flight maneuver (Southern
Hemisphere viewing).
UARS has been given permission to executing the scheduled 18-minute
burns on 12 October 2005. Authorization has also been given to
complete as many burns as possible in the current yaw direction. The
FOT will proceed with the remaining burns scheduled for 12 October
2005, 18 October 2005, and 20 October 2005.
Attachments: Appendix A, Real-time Command 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 07 October 2005
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
76949 274/1227 05-351 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
76981 276/1601 05-352 OBC TMON 46 TIME DELAY CHANGED 16:40
76983 276/1857 05-353 OBC/CLK CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
76995 277/1417 05-354 MACS END OF MISSION BURN 1 STEP 3,22
76996 277/1519 05-354 MACS EOM BURN 1 STEP 1
76996 277/1558 05-354 MACS EOM BURN 1 STEP 2-10
76996 277/1558 05-355 MACS ESAM 2 ON
76997 277/1701 05-354 MACS EOM BURN 1 STEP 11-24
76997 277/1741 05-354 MACS EOM BURN 1 STEP 23
76998 277/1819 05-355 MACS ESAM 2 OFF
76998 277/1819 05-356 MPS VT LEVEL 7 TO VT LEVEL 6
76998 277/1854 05-356 TMON TMON 46 TIME DELAY 5:30
77000 277/2136 05-357 TMON TMON 46 TIME DELAY 12:30
77012 278/1629 05-358 OBC LOAD NOMINAL EPH TOLERANCES
77025 279/1321 05-359 MACS EOM BURN #2 - STEP 1
77025 279/1357 05-359 MACS EOM BURN #2 - STEP 2-11
77025 279/1357 05-360 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
77026 279/1457 05-359 MACS EOM BURN #2 - STEP 12-23
77026 279/1537 05-359 MACS EOM BURN #2 - STEP 24-27
77026 279/1537 05-361 OBC EPH LOAD REJECT CORRECTION
77029 279/2014 05-362 OBC DEFAULT EPH TOLERANCES
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 07 October 2005
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 07 October 2005
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
76949 274/1231 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
76983 276/1859 CLK ADJ FR 0.0 TO 20.6 MSEC/DAY
77025 279/1357 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 07 October 2005
30 September 2005 - GMT Day 273 Beta = 58.2 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 -1.79/ -2.42 +00.0/+00.0 04.6 0.00 0.0
2 -700.0/-700.0 -1.48/ -2.42 +08.0/-03.2 26.4 1.09 2.2
3 084.0/ 033.6 +10.40/ +9.06 +38.0/-24.0 26.4 1.04 27.6
07 October 2005 - GMT Day 280 Beta = 61.2 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 -1.79/ -3.05 +00.0/+00.0 04.6 0.00 0.0
2 -700.0/-700.0 -1.17/ -2.42 +09.6/-05.6 25.8 1.08 2.3
3 324.8/ 056.0 +9.73/ +7.74 +37.6/-27.6 25.8 1.05 25.8
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
76998 277/1819 LV7 -> LV6
APPENDIX E
UARS ANOMALY REPORTS
Week ending 07 October 2005
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
05-047 FOT 76954 274/2023 30832 Generic Late Acquisition
05-047 FOT 76974 276/0440 30832 Generic Late Acquisition
05-047 FOT 76992 277/0939 30832 Generic Late Acquisition
05-047 FOT 76993 277/1119 30832 Generic Late Acquisition
05-048 FOT 76997 277/1741 41006 Post-Burn Late Acq (05:04)
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
05-044 FOT See List Sept 05 30832 Generic Late Acquisition
ANOMALY INVESTIGATION REPORTS GENERATED
AIR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
OPEN ANOMALY REPORTS
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
05-042 MPS 76339 233/2347 N/A BATTERY 2 DIFFV -700mV
05-047 FOT See List Oct 05 30832 Generic Late Acquisition
05-048 FOT 76997 277/1741 41006 Post-Burn Late Acq (05:04)