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UARS WEEKLY STATUS REPORT - 07 FEB 2003
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SOLSTICE
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Nothing received.
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SUSIM
***********
Nothing received.
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ACRIM
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Nothing received.
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PEM
***********
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 1998329 has been
reprocessed and archived at the GSFC DAAC. HEPSA data between 1998330 and
1998350 is waiting to be archived at the GSFC 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 participated in the UARS/TOMS Monthly Status
Review meeting held on February 4, 2003.
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 25 January 2003 (Orbit 62202, GMT Day 025) through
31 January 2003 (Orbit 62307, GMT Day 031).
SPACECRAFT OPERATION
The observatory is now in Forward Flight (Southern Hemisphere viewing)
and is performing nominally under two-battery operations. The
instrument operational changes were:
INSTRUMENT OPERATIONAL CHANGES
Instrument Time Orbit Comment
HRDI 026/0618 62221 LOW POWER MODE
PEM 026/1307 62225 POWR OFF ZEPS/NEPS
SOLSTICE 026/2146 62231 DAY ONLY MODE
SUSIM 026/2222 62231 POWER OFF
SOLSTICE 029/1327 62271 POWER ON
SUSIM 029/1507 62272 POWER ON
HALOE 031/1241 62300 POWER ON
A Reverse-to-Forward Yaw Around maneuver (number 116) was successfully
executed in Orbit 62242 beginning 027/16:05:04Z and completing at
027/16:42:14Z on 27 January 2003. All instruments were in their off
or standby mode (including HRDI and PEM). Due to the SA position at
269 degrees, the effective night length of the spacecraft after the
maneuver was approximately 56.80 minutes. Post maneuver analysis of
data indicate that during the Yaw Around, the end-of-night load bus
voltage was 26.40 volts and the average depths of discharge (DODs) on
Batteries 2 and 3 were approximately 20.27 and 19.69 percent
respectively. The next (forward-to-reverse) YAW is scheduled for 01
March 2003 (DOY 060).
The beta angle ranged between the angles of 05.4 degrees to 12.5
degrees for this report period. The beta angle is now decreasing
towards a maximum angle of 43 degrees on 13 February 2003 (DOY 044).
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 1.91 to 1.92 degrees C. Additional
battery performance data for each battery on 24 January and 31 January
2003 are provided in Appendix D.
The clock error ranged from -10.2 to 10.6 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 = 03
HRDI = 01
PEM = 01
SOLSTICE = 02
SUSIM = 02
HALOE = 02
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 00
One (1) 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 received the new build of the Eclipse ground software (Eclipse
2.0) on 29 January 2003. This build contains several fixes to open
DRs and will require the FOT to thoroughly check each one. Testing
may continue through next week and if no discrepancies are found, it
will be released for operations.
A new patch to the User Planning System was delivered on 28 January
2003. This patch will provide UARS with the ability to utilize the
new TDRS naming convention. The transition date for the new
convention has yet to be announced.
MEETINGS
-None this report period
FUTURE SIGNIFICANT EVENTS
The next UARS Yaw slew is scheduled for 01 March 2003 (DOY 060). This
maneuver will be a Forward to Reverse Flight maneuver (Northern
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 31 January 2003
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
62221 026/0618 03-021 HRDI LOW POWER MODE (YAW)
62225 026/1307 03-022 PEM POWER OFF ZEPS/NEPS
62231 026/2146 03-024 SOLSTICE DAY ONLY MODE
62231 026/2222 03-023 SUSIM POWER OFF
62242 027/1446 03-026 MACS YAW SCRIPT
62253 028/0822 03-025 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
62271 029/1327 03-027 SOLSTICE POWER ON
62272 029/1507 03-028 SUSIM POWER ON
62272 029/1507 03-029 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
62280 030/0413 03-028 SUSIM POWER ON (COMPLETE)
62300 031/1241 03-030 HALOE POWER ON
62305 031/1939 03-031 HALOE POWER ON PART 2
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 31 January 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 31 January 2003
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
62253 028/0825 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
62272 029/1530 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 31 January 2003
24 January 2003 - GMT Day 024 Beta = 14.0 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 -162.4/-184.8 -3.36/-4.94 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-56.0 +5.79/+4.50 +32.1/-14.4 25.3 1.030 21.5
3 +33.6/-22.4 +4.50/+3.23 +28.8/-14.4 25.1 1.020 21.0
31 January 2003 - GMT Day 031 Beta = 12.5 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 -162.4/-184.8 -3.68/-4.94 +00.0/+00.0 08.3 0.000 0.0
2 +11.2/-89.6 +5.79/+3.87 +29.6/-12.8 25.8 1.020 21.3
3 +28.0/-44.8 +4.51/+2.60 +28.8/-12.8 25.8 1.020 20.9
V/T LEVEL CHANGES
ORB# AOS TIME LVL FR-TO
----- -------- ---------
62242 027/1446 L5 -> L6
62256 028/1446 L6 -> L5
APPENDIX E
UARS ANOMALY REPORTS
Week ending 31 January 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
------ ------ ----- ---- --- -----------------
03-002 FOT 62102 018/0814 32101 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
------ ------ ----- ---- --- -----------------
02-060 FOT 61421 338/0057 N/A PSU Cmd Clock Timeout