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UARS WEEKLY STATUS REPORT - 15 August 2003
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SOLSTICE
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During this week, SOLSTICE continued to operate in good health gathering
solar data on all available orbital tracking periods. We gathered
collaborative data with Tuesday's successful TIMED/SEE calibration
rocket (NASA 36.205). This week we received about 55% of each day's data
amounting to about 550 minutes of solar observing time per day.
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SUSIM
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SUSIM successfully gathered all of its daily mid resolution, weekly
offset, and O2 occultation scans during periods of UARS telemetry or
periods of onboard tape recording.
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ACRIM
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Nothing received.
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PEM
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The PEM web site has moved. It has a new URL. Access the PEM web site
using http://wwwpem.space.swri.edu. The PEM data from the GUVI conjunction
periods has moved to http://wwwpem.space.swri.edu/guvi-pem.html.
Level 2 PEM HEPSA data files are being reprocessed for submission to the
DAAC. This data has been designated as version 2; however, there is no format
difference from the version 1 data format. Version 2 HEPSA data is being
generated because it was discovered that there exists processing errors within
some of the HEPSA version 1 data files. Thus, if you are using any HEPSA
version 1 data files from the DAAC, please replace them with the version 2
data files. Currently, HEPSA data between 1991274 and 2002129 has been
reprocessed and archived at the GSFC DAAC. HEPSA data files from 2002130
through 2002149 are processed and awaiting archiving at the DAAC.
PEM continues to work with the GUVI team on the diagnosis of data from
the first conjunction period. Analysis of the two conjunction passes showed
that the aurora as detected by GUVI was at higher latitude than UARS.
GUVI images from other times from the first conjunction period show spatial
regions that both GUVI and PEM sampled when aurora was present. Separation
is several minutes to 10's of minutes when both instruments saw aurora.
PEM has seen no aurora during the second conjunction period. Due to a
spacecraft anomaly, no PEM data was collected during the third conjunction
period.
PEM continues to receive NMC data files from NOAA. No problems have
been encountered. NOAA has changed the binary structure of the NMC data and
PEM is now receiving two data streams, one in the original VAX format and the
other from their new binary format.
*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 in support of the Science Traceability
Mission of UARS.
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 02 August 2003 (Orbit 65044, GMT Day 214) through
08 August 2003 (Orbit 65149, GMT Day 220).
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 215/1207 65066 POWER ON - DAY ONLY
PEM 216/1532 65084 POWER ON (BEGIN)
HRDI 217/2040 65102 FULL-TIME TO DAY ONLY
PEM 219/2214 65133 POWER OFF AXIS-1
The beta angle ranged between the angles of 25.6 degrees to 39.5
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 42 degrees on 11 August 2003 (DOY 223).
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 23.6 V end-of-night (EON) load bus
voltage. Battery temperatures are stable with a temperature delta
between Battery 2 and Battery 3 of 1.27 to 1.28 degrees C. Additional
battery performance data for each battery on 01 August and 08 August
2003 are provided in Appendix D.
The clock error ranged from -06.8 to 04.9 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.
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
PEM = 03
HRDI = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 05
Five (5) 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
The suggestion to go to the VT-6 charge level one day prior to the yaw
maneuver was approved at the UARS Monthly Status Meeting. This was
suggested in order to keep the differential voltage down prior to the
yaw. This change will be implemented for the reverse to forward yaw
maneuver on 26 August 2003.
MEETINGS
The FOT attended the UARS Monthly Status Review to present the
significant events from the month of July.
The FOT also attended the biweekly UARS DRB meeting to review open
Eclipse DRs.
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 27 August 2003 (DOY 239).
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 08 August 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
65066 215/1207 03-202 PEM POWER ON - DAY ONLY
65081 216/1205 03-203 PEM AXIS-1 POWER ON ATTEMPTS
65084 216/1532 03-203 PEM AXIS-1 POWER ON (BEGIN)
65084 216/1532 03-203 PEM AXIS-1 POWER ON (CONCLUSION)
65102 217/2040 03-204 HRDI FULL-TIME TO DAY ONLY
65133 219/2214 03-205 PEM POWER OFF AXIS-1
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 08 August 2003
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 08 August 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
-None this report period.
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 08 August 2003
01 August 2003 - GMT Day 213 Beta = 22.5 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 -700.0/-700.0 -3.05/-4.31 +00.0/-00.0 07.2 0.000 0.0
2 +00.0/-123.2 +6.44/+4.83 +28.8/-15.2 24.3 1.030 20.9
3 +22.4/-50.4 +5.15/+3.87 +28.0/-15.2 24.2 1.020 20.6
08 August 2003 - GMT Day 220 Beta = 39.5 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 -700.0/-700.0 -3.05/-4.31 +00.0/-50.0 07.2 0.000 0.0
2 +11.2/-123.2 +5.47/+4.19 +26.4/-50.0 25.0 1.030 20.0
3 +22.4/-67.2 +4.51/+3.23 +25.6/-50.0 25.0 1.030 20.0
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
-None this report period.
APPENDIX E
UARS ANOMALY REPORTS
Week ending 08 August 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
03-037 FOT 65059 215/0007 30832 Generic Late Acquisition
03-038 FOT 65061 215/0304 33390 Degraded data
03-039 FOT 65081 216/1205 N/A PEM AXIS-1 Power ON Problem
03-040 FOT 65099 217/1634 33399 Dropouts / COP status changes
03-041 FOT 65120 219/0110 33410 Negative Acquisition 1KB Omni
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
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
------ ------ ----- ---- --- -----------------
03-037 FOT See List August 03 30832 Generic Late Acquisition
03-038 FOT 65061 215/0304 33390 Degraded data
03-039 FOT 65081 216/1205 N/A PEM AXIS-1 Power ON Problem
03-040 FOT 65099 217/1634 33399 Dropouts / COP status changes
03-041 FOT 65120 219/0110 33410 Negative Acquisition 1KB Omni