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Mission Operations Days: 2001/307 to 2001/313
November 03, 2001 00:00:00 GMT to November 09, 2001 00:00:00 GMT

See “Non-MODIS Significant Events” below for details.

Terra Spacecraft and MODIS Instrument Status:

Terra (AM-1) is in Normal Ops Mode
MODIS is in Science Mode - A Side
Component State(s) Comment
Blackbody A On (290 K); B Off Nominal
Calibration Electronics A On; B Off Nominal
Control Processor A On; B Off Nominal
Nadir Door Unlatched, Open Nominal
Space View Door Unlatched, Open Nominal
Solar Diffuser Door Unlatched, Closed Nominal
FDDI Formatter A On; B Off Nominal
FDDI Port A On; B Off Nominal
FIFO Memory #1 & #2 On; #3 & #4 Off Nominal
Format Processor A On; B Off Nominal
Power Supplies #1 On; #2 Off Nominal
PV VIS FPA A On; B Off Nominal
PV NIR FPA A On; B Off Nominal
PV SMIR FPA A On; B Off Nominal
PV LWIR FPA A On; B Off Nominal
PC LWIR FPA A On; B Off Nominal
RC Outgas Heaters All Off (CS, IS, OS) Nominal
RC LWIR FPA Heater On (83 K) Nominal
RC SMIR FPA Heater Off Nominal
Scan Assembly A On; B Off Nominal
SDSM A Off; B Off Nominal
SRCA A Off; B Off Nominal
PS1 Survival Heater Enabled Nominal
PS2 Survival Heater Enabled Nominal
Timing Generator A Off; B On Nominal
Flight Software Rev BD + 3 set of patches
  • FR Error Counting and Statistics (2 patches)
  • FR Band 5 Gain Change (20 commands)
  • FR BB Ideal Output Values (1 patch)
Inhibit Ids Set None Nominal
TMON 66 (SRCA A) Disabled Nominal
TMON 67 (SRCA B) Disabled Nominal
TMON 68 (FIFO) Enabled Nominal
TMON 69 (EPS Current) Disabled Nominal

This Week's Completed MODIS Activities:

Saturday, November 3, 2001


Sunday, November 4, 2001


Monday, November 5, 2001

Lunar Roll Maneuver (-11.8272 degree roll)
2001/309 17:39:32 Real-Time IRU set to High Rate (lower spacecraft attitude precision)
2001/309 17:40:06 ATC Formatter to Night Rate set ahead by 03:23 to ensure 50/50 day/night data collection
2001/309 18:15:03 ATC Formatter to Day Rate
2001/309 18:15:05 ATC SCIABNORM flag set to ABNORM
2001/309 18:15:07 ATC PV DCR computation to OFF
2001/309 18:15:09 ATC PC DCR computation to OFF
2001/309 18:15:11 ATC Sector rotation to –3072
2001/309 18:21:41 ATC Sector rotation to 0
2001/309 18:21:43 ATC PC DCR computation to ON
2001/309 18:21:45 ATC PV DCR computation to ON
2001/309 18:21:47 ATC SCIABNORM flag to NORM
2001/309 18:21:49 ATC Formatter to Night Rate
2001/309 18:36:18 ATC Moved Formatter to Day Rate later by 03:23 to ensure 50/50 day/night data collection
2001/309 18:45:00 Real-Time IRU set to Low Rate (greater spacecraft attitude precision)

Tuesday, November 6, 2001


Wednesday, November 7, 2001

2001/311 16:34:56 ATC OA16: SDSM SCREENED
2001/311 18:10:01 ATC OA15: SDSM OPEN

Thursday, November 8, 2001


Friday, November 9, 2001


This Week's Scheduled MODIS Activities Not Completed:


Upcoming MODIS Events:

Field campaign 2001/314 through 2001/322.

Two SD/SDSM calibrations will be scheduled during the upcoming week.


The topics of Terra's orbit inclination adjust maneuvers and eventual equator crossing time has resurfaced. Terra's equator crossing mean local time (MLT) requirement is 10:30 +/- 00:15. The current crossing time is about 10:35 and decreasing by 1-2 seconds per day. The orbit management talks have begun because, under current conditions, Terra will approach the SAC-C spacecraft very closely in April of 2002. Further details will follow as a finalized plan emerges.

MODIS Anomalies:

Formatter Error Events:

As of 2001/312, 05:21:58, the FR error counter (MOD_SS_CP_STATUS_08) has “rolled over” 70 times since the A-Side restart following the PS-2 Anomaly, and 68 times since the latest string of errors started on August 15. This is a 16-bit signed counter, therefore it “rolls over” every 32,768 counts. At this time, the total number of errors seen is roughly 2.3 million.

The FR Error Rate roll over period appears to be approaching roughly an 11-hour period. The period decreases and increases based on cooling or heating (respectively) of the MODIS electronics from internal calibrations (BB, SRCA, and SD/SDSM) activities. However, once an activity has completed, and the MODIS electronic thermal balance returns to “non-activity” levels, the error rate returns to it previous 11-hour roll over period.

An error tracking spreadsheets have been updated and can be retrieved from:

An MS Excel spreadsheet called, AM1_FR_error_rollovers_MMDDYY.xls contains the data for the times each of the error count “roll over” occurs (with the MMDDYY denoting the date the spreadsheet was made on, the more recent date containing the most up-to-date information).

General Instrument Comments:

MODIS is in Science Mode on the A-side with the SVD and NAD open, operating with the Formatter Resolution Flight Software Patches (FRFSP).

Note: SD/SDSM calibrations were planned to be reduced to once per two weeks. This plan has been revised; SD/SDSM calibrations will continue to be scheduled once each week until the end of November.

MODIS Telemetry Trends:

Instrument temperatures across the board are rising slightly as of late, although the orbit beta angle has not yet reached its minimum.

Non-MODIS Significant Events:

The Network Communications Center (NCC) has been rejecting and/or canceling Terra TDRSS contact times (likely to support DOD satellites). This has resulted in at least one incidence of data loss.

On day 2001/310 there were two MODIS data losses. The first was a playback lockup loss of 30,000 cadu's. The second was a loss of 14,354,068 cadu's due to an MDA2 failure. Both of these data losses encompassed data gathered between 310/00:24:35 and 310/06:41:57. The exact time has not been determined yet due to the high number of MDA2 failures.

The full Data Loss Report can be viewed at:

Select "Search Data Losses", and provide the following information:

Data Type: MOD Loss Start: 310

Then press the big SUBMIT button.

Limited Life Item Status:

SRCA 10W Lamp #1: 192.2 of 500 hours
SRCA 10W Lamp #2: 146.6 of 500 hours
SRCA 10W Lamp #3: 155.8 of 500 hours
SRCA 10W Lamp #4: 61.5 of 500 hours

SRCA 1W Lamp #1: 558.3 of 4000 hours
SRCA 1W Lamp #2: 276.3 of 4000 hours

Solar Diffuser Door: 1751 of 3022 Movements
Nadir Aperture Door: 532 of 1316 Movements
Space View Door: 437 of 1316 Movements