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UARS WEEKLY STATUS REPORT - 14 March 2003
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SOLSTICE
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SOLSTICE continues to operate normally, taking solar data on all
available orbital tracking periods.
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SUSIM
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SUSIM successfully gathered all of its daily mid resolution, weekly
offset, and occultation scans during periods of UARS telemetry.
SUSIM has been experiencing data integrity problems from files copied
from the CDHF. Since level 0 files are obtained directly from PACOR-A,
our production processing is not directly affected.
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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 2001365 has been
reprocessed and archived at the GSFC DAAC. SwRI is working on reprocessing
data PEM for 2003.
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 01 March 2003 (Orbit 62729, GMT Day 060) through 07
March 2003 (Orbit 62833, GMT Day 066).
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
SUSIM 062/1514 62768 POWER ON
SOLSTICE 062/1557 62768 DAY ONLY TO FULL TIME
HALOE 064/1511 62798 POWER ON
A Forward-to-Reverse Yaw Around maneuver (number 117) was successfully
executed in Orbit 62738 beginning 060/14:59:18Z and completing at
060/15:36:28Z on 1 March 2003. All instruments were in their off or
standby mode (except for SOLSTICE in day-only). Due to the SA
position at 269 degrees, the effective night length of the spacecraft
after the maneuver was approximately 57.62 minutes. Post maneuver
analysis of data indicate that during the Yaw Around, the end-of-night
load bus voltage was 26.08 volts and the average depths of discharge
(DODs) on Batteries 2 and 3 were approximately 20.97 and 20.27 percent
respectively. The next (reverse-to-forward) YAW is scheduled for 06
April 2003 (DOY 096).
The beta angle ranged between the angles of 2.4 degrees to 24.9
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 57 degrees on 20 March 2003 (DOY 081).
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 0.96 degrees C. Additional
battery performance data for each battery on 28 February and 07 March
2003 are provided in Appendix D.
The clock error ranged from -8.3 to 12.1 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 = 02
SUSIM = 01
SOLSTICE = 01
HALOE = 02
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 00
Two (2) Anomaly Report remained OPEN at the end of this report period
(see Appendix E).
GROUND SYSTEM OPERATION
Zero (0) 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 began testing the new software release of the Eclipse software
(Version 2.1). This release contains several fixes in response to DRs
written, including wait statement and status buffer issues. Testing
showed that both the wait statement and status buffer problems had not
been fixed, so the Raytheon development team has been informed and
they will try to give us an updated build as soon as possible.
MEETINGS
-None this report period
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 06 April 2003 (DOY 096). 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 07 March 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
62737 060/1325 03-052 OBC YAW MANEUVER FWD TO REV
62738 060/1602 03-053 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
62752 061/1334 03-052 PSU VT LV 6 TO VT LV 5
62768 062/1514 03-054 SUSIM POWER ON START
62768 062/1557 03-055 SOLSTICE DAY ONLY TO FULL-TIME MODE
62781 063/1232 03-054 SUSIM POWER ON
62798 064/1511 03-056 HALOE POWER ON PART 1
62800 064/1845 03-057 HALOE POWER ON PART 2
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 07 March 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 07 March 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
62738 060/1602 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 07 March 2003
28 February 2003 - GMT Day 059 Beta = 6.3 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 -168.0/-196.0 -3.68/-4.94 +00.0/+00.0 08.3 0.000 0.0
2 +16.8/-22.4 +4.51/+3.55 +28.0/-12.8 25.9 1.020 19.9
3 +22.4/-22.4 +3.23/+2.60 +27.2/-12.8 25.9 1.020 19.5
07 March 2003 - GMT Day 066 Beta = 24.9 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 -168.0/-190.4 -3.05/-4.31 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-56.0 +5.46/+4.50 +28.0/-14.4 25.8 1.020 20.2
3 +28.0/-22.4 +4.50/+3.23 +28.4/-14.4 25.8 1.000 19.9
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
62737 060/1325 LV5 -> LV6
62752 061/1334 LV6 -> LV5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 07 March 2003
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
-None this report period.
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
------ ------ ----- ---- --- -----------------
02-060 FOT 61421 338/0057 N/A PSU Cmd Clock Timeout
03-005 FOT 62559 048/1757 32330 CDS Equipment problem