********************************************************************
UARS WEEKLY STATUS REPORT - 07 JUNE 2002
********************************************************************
***********
SOLSTICE
***********
SOLSTICE continues to operate normally, taking solar data on all
available orbital tracking periods.
***********
SUSIM
***********
SUSIM has successfully performed its daily mid-resolution and MgII
solar scans during periods of predicted UARS telemetry.
The Pacor-A/SUSIM interface agreement was read, reviewed, signed and
returned.
***********
ACRIM
***********
Nothing received.
***********
PEM
***********
PEM wishes to thank the SUSIM team for producing UARS attitude files.
The PEM team was able to up-load these data to CDHFB:: and generate the PEM
O/A subset information for its processing of science data.
PEM support of the UARS Traceability Mission for the TIMED mission has
been organized with the GUVI team. PEM data was collected from April 18
through April 24. During this time period, there were two spacecraft contacts.
Early PEM data from the contact times showed no aurora. No significant aurora
appeared at the predicted highest invariant latitudes; however, lower invariant
latitude passes did show significant aurora. It appears as though magnetic
activity increased at times when UARS was not at its peak invariant latitudes
and some of the particle precipitation activity was captured by the PEM
instrumentation. PEM wishes to thank Bob Neff and Rich Beck at GSFC for their
efforts in retriving as much of the PEM data as possible.
The PEM specific orbit/attitude and high-energy particle data processing
has been completed. A selected set of PEM images showing precipitating
electrons and protons has been produced and is available at
"http://pemrac.space.swri.edu/guvi-pem.html".
PEM is working with the GUVI team to identify a second time period for
coordinated measurements. Early 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 and the TIMED-UARS orbits are nearly perpendicular at
this time. More investigation into what electron spectra are predicted needs
to be performed in order to determine if it is feasible to operate a GUVI-PEM
campaign after the June YAW.
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.
***********
HALOE
***********
Nothing received.
***********
MLS
***********
Nothing received.
***********
HRDI
***********
Nothing received.
***********
WINDII
***********
Nothing received.
***********
MPG
***********
Daily processing of instrument Daily Activity Plans continues
with no problems.
***********
CDHF
***********
Nothing received.
***********
FOT
***********
This report covers 25 May 2002 (Orbit 58521, GMT Day 145) through 31
May 2002 (Orbit 58625, GMT Day 151).
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
SOLSTICE 146/1309 58543 FULL-TIME
SUSIM 146/1634 58546 POWER ON
HALOE 149/1304 58588 POWER ON
PEM 150/1302 58603 DAY-ONLY
The beta angle ranged between the angles of 5.3 degrees to 23.7
degrees for this report period. The beta angle is now increasing
towards a maximum angle of 34 degrees on 08 June 2002 (DOY 159).
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 1.20 to 1.28 degrees C. Additional
battery performance data for each battery on 24 May and 31 May 2002
are provided in Appendix D.
The clock error ranged from -10.0 to 11.0 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
SOLSTICE = 01
SUSIM = 01
HALOE = 01
PEM = 01
UARS Anomaly Reports initiated during this report period are listed in
Appendix E and summarized below.
FOT = 1
One (1) 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
One (1) 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. All of the existing
documentation is also in the process of being updated to reflect the
new ground system nomenclature. A few new SOPs have yet to be
written, while the handful that have already been written need to be
finalized and signed off on. A new release of the Eclipse software is
scheduled for the end of the month, which should take care of most of
the changes needed.
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 31 May 2002
ORBIT AOS NO. SUBSYS REASON
----- --- --- ------ ------
58543 146/1309 02-192 SOLSTICE TO FULL-TIME OPS
58546 146/1634 02-193 SUSIM POWER ON (START)
58547 146/1819 02-193 SUSIM POWER ON (CONT.)
58557 147/1126 02-193 SUSIM POWER ON (COMPLETE)
58571 148/0903 02-194 OBC/CLK CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
58588 149/1221 02-195 OBC/CLK CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
58588 149/1304 02-196 HALOE POWER ON PART #1
58592 149/1919 02-196 HALOE POWER ON PART #2
58603 150/1302 02-197 PEM POWER ON TO DAY-ONLY MODE
APPENDIX B
OUT-OF-LIMITS & ALERTS OCCURRENCES
Week ending 31 May 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 31 May 2002
CLOCK DRIFT RATE ADJUSTMENTS
ORBIT TIME CLOCK RATE CHANGE
----- ----- -----------------
58571 148/0906 CLK ADJ FR 0.0 TO -20.6 MSEC/DAY
58588 149/1225 CLK ADJ FR -20.6 TO 0.0 MSEC/DAY
APPENDIX D
UARS BATTERY PERFORMANCE DATA
Week ending 31 May 2002
24 May 2002 - GMT Day 144 Beta = 02.0 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 +728.0/+728.0 -3.68/-4.62 +00.0/+00.0 0.0 0.000 0.0
2 +11.2/-72.8 +5.47/+4.51 +27.2/-13.6 23.8 1.020 20.7
3 +22.4/-33.6 +4.19/+3.23 +26.8/-13.6 23.8 1.010 20.4
31 May 2002 - GMT Day 151 Beta = 23.7 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 0.0 0.000 0.0
2 +11.2/-100.8 +5.79/+4.51 +28.8/-14.4 24.5 1.030 20.7
3 +22.4/-044.8 +4.51/+3.23 +28.0/-14.4 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 31 May 2002
NEW ANOMALY REPORTS GENERATED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-033 FOT 58553 147/0359 N/A SSPP IN WAIT MODE/PLANNING ERR
ANOMALY CLOSURE INFORMATION RECEIVED
AR NO. SUBSYS ORBIT TIME TTR PROBLEM/DATA LOSS
------ ------ ----- ---- --- -----------------
02-026 FOT See List May 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