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UARS WEEKLY STATUS REPORT - 21 June 2002
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SOLSTICE
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Nothing received.
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SUSIM
***********
SUSIM was turned off on June 18 for the yaw-around. Otherwise,
SUSIM successfully performed its daily mid-resolution and MgII
solar scans during periods of predicted UARS telemetry.
Because problems were found in the solar pointing model used to
compute UV irradiances, the entire SUSIM data set requires
reprocessing. In addition, a new algorithm has been adopted that
finds and corrects occasional solar pointing data dropouts. As we
are not quite ready to reprocess all the way to level 3, the RSS
system was to be used to do a level 1 reprocessing, the same level
of reprocessing that the CDHF performed for us just before its
demise. At that time (2001), approximately 2500 days were
reprocessed by the CDHF over a period of about 4 months. By
contrast, about 3800 days were reprocessed by only one of the 5
SUSIM VAXes in just over two days.
One reason for the large difference may stem from how each
reprocessing run was set up. The CDHF was apparently editing
runstreams by hand, whereas the SUSIM RSS-mode runstreams were
produced automatically by routines put together by Ed Esfandiari.
Another difference may be in the staging of input files. On the
CDHF, some of the input files may have been located in long-term
storage whereas on the SUSIM RAC, the input files were located on
readily accessible disk farms. The level 1 reprocessing is less
computing intensive than we expect the level 3 reprocessing to be,
so more VAXes may need to be harnessed to swiftly complete the
latter.
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ACRIM
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Nothing received.
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PEM
***********
PEM continues to work with the GUVI team on the diagnosis of data from
the first conjunction period.
PEM has been working with the GUVI team to identify a second time period
for coordinated measurements. Predictions show the best time of conjunction
is just after the UARS YAW at the end of June; however, the spacecraft power
my not be sufficient to operate PEM. The orbital conditions are different
from the first period where the TIMED-UARS orbits are nearly perpendicular at
this time. PEM operations is requested to begin three orbits prior to and
last for three orbits after conjunction times. Predicted orbital conjunctions
as of June 14 (varies with each new set of predictions) are:
STK
Contact # Date Day Time Geo Lat ILAT MLT Hemisphere Note
(deg) (deg) (hr)
1 June 24 175 00:28 -56.98 66.01 13.13 South No UARS Power
2 June 24 175 01:17 56.74 56.25 0.96 North No UARS Power
3 June 24 175 02:05 -56.70 69.22 13.11 South No UARS Power
4 June 28 179 18:42 56.50 52.79 22.86 North
5 June 28 179 19:30 -56.45 51.40 12.17 South
6 July 3 184 12:55 -55.65 42.74 8.83 South
7 July 3 184 13:44 54.44 48.93 21.72 North
8 July 8 189 07:09 52.92 51.12 19.70 North
9 July 8 189 07:57 -52.81 52.66 7.41 South
10 July 13 194 01:22 -50.90 63.19 6.53 South
11 July 13 194 02:10 50.78 60.61 19.19 North
12 July 13 194 02:58 -50.64 58.70 6.21 South
13 July 17 198 20:23 -49.38 61.61 7.04 South
14 July 17 198 21:11 49.24 53.08 19.32 North
15 July 17 198 22:00 -46.92 60.91 6.80 South
As dates of predicted orbital elements improve, contacts appear and disappear
from this list; however, in general the conjunctions seem to be occurring at
higher latitudes as the measurement time period approaches (higher latitude
contacts increase the chance for adequate precipitation to produce a common
signal).
PEM continues to receive NMC data files from NOAA. No problems have
been encountered.
*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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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 08 June 2002 (Orbit 58731, GMT Day 159) through 14
June 2002 (Orbit 58835, GMT Day 165).
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 161/1216 58768 POWER OFF
SUSIM 161/1216 58768 POWER OFF
SOLSTICE 161/1358 58769 POWER OFF
HALOE 161/1803 58771 POWER OFF
HALOE 162/1438 58785 POWER ON
SOLSTICE 163/1214 58798 POWER ON
SUSIM 163/1438 58800 POWER ON
PEM 163/1800 58802 POWER ON
The beta angle ranged between the angles of 34.1 degrees to 25.6
degrees for this report period. The beta angle is now decreasing
towards a minimum angle of 0 degrees on 21 June 2002 (DOY 172).
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 0.96 to 1.28 degrees C. Additional
battery performance data for each battery on 07 June and 14 June 2002
are provided in Appendix D.
The clock error ranged from -4.2 to 06.8 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 = 00
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 2
Two (2) Anomaly Reports remained OPEN at the end of this report period
(see Appendix E).
TRANSPONDER FREQUENCIES:
Transponder A: 01/333 - 2287.496855
Transponder B: 02/043 - 2287.498879
GROUND SYSTEM OPERATION
Two (2) 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
The FOT is in the process of implementing some minor changes to the
Eclipse system to help optimize operations. The new release of the
Eclipse software is currently being tested. If the testing continues
to go well, this release should be moved to operations after the yaw
on 21 June 2002.
The FOT awaits a decision regarding opening firewall rules for the new
TAC systems on the new UARS subnet. This is necessary to move the TAC
replacement systems out of building 14 and into the control center.
MEETINGS
-None this report period
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 21 June 2002 (DOY 172). This
maneuver will be a Reverse to Forward Flight maneuver (Southern
Hemisphere viewing).
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 14 June 2002
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
58742 159/1904 02-201 WINDII MUB TO DISABLE
58768 161/1216 02-202 PEM POWER OFF
58768 161/1216 02-203 SUSIM POWER OFF
58769 161/1358 02-204 SOLSTICE POWER OFF
58771 161/1803 02-205 HALOE POWER OFF
58785 162/1438 02-206 HALOE POWER ON
58798 163/1214 02-207 SOLSTICE POWER ON
58800 163/1438 02-208 SUSIM POWER ON (START)
58802 163/1800 02-209 PEM POWER ON
58816 164/1716 02-208 SUSIM POWER ON (FINISH)
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 14 June 2002
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 14 June 2002
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
-None this report period
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 14 June 2002
07 June 2002 - GMT Day 158 Beta = 34.1 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 -3.05/-4.62 +00.0/+00.0 0.0 0.000 0.0
2 +11.2/-106.4 +5.15/+3.87 +28.0/-14.4 25.1 1.030 20.1
3 +22.4/-044.8 +4.19/+2.92 +27.2/-14.0 25.1 1.020 19.9
14 June 2002 - GMT Day 165 Beta = 25.6 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 -3.05/-4.31 +00.0/+00.0 9.4 0.000 0.0
2 +11.2/-100.8 +5.47/+4.51 +28.0/-14.4 24.6 1.020 20.7
3 +22.4/-050.4 +4.51/+3.23 +27.2/-14.0 24.5 1.020 20.4
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-no changes V/T 5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 14 June 2002
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-036 FOT 58798 163/1214 30832 Generic Late Acquisition
02-036 FOT 58808 164/0416 30832 Generic Late Acquisition
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-036 FOT See List June 01 N/A Generic Late Acquisition
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
------ ------ ----- ---- --- -----------------
02-033 FOT 58553 147/0359 N/A SSPP IN WAIT MODE/PLANNING ERR
02-035 FOT 58719 158/0606 44490 WSGT EQUIP PROBLEMS
02-035 FOT 58720 158/0746 44490 WSGT EQUIP PROBLEMS