Mission Operations Days: 2003/305 to 2003/311
November 01, 2003 00:00:00 GMT to November 07, 2003 00:00:00 GMT

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Terra Spacecraft and MODIS Instrument Status:

AM-1 "Terra" is in Normal Mode PFM MODIS is in A-Side Nominal Science Mode (Cross Strapped with FR B)
Component	State(s)	Comment
Blackbody	A On (290K); B Off	Nominal Science Mode
Calibration Electronics	A On; B Off	Nominal Science Mode
Control Processor	A On; B Off	Nominal Science Mode
Nadir Door	Unlatched, Open	Nominal Science Mode
Space View Door	Unlatched, Open	Nominal Science Mode
Solar Diffuser Door	Unlatched, Screened	Permanent Configuration
FDDI Formatter	A On; B Off	Nominal Science Mode
FDDI Port	A On; B Off	Nominal Science Mode
FIFO Memory	#1 & #2 On; #3 & #4 Off	Nominal Science Mode
Format Processor	A Off; B On	Nominal Science Mode
Power Supplies	#1 On, #2 Off	Nominal Science Mode
PV VIS FPA	A On; B Off	Nominal Science Mode
PV NIR FPA	A On; B Off	Nominal Science Mode
PV SMIR FPA	A On; B Off	Nominal Science Mode
PV LWIR FPA	A On; B Off	Nominal Science Mode
PC LWIR FPA	A On; B Off	Nominal Science Mode
RC Outgas Heaters	All 3 (CS, IS, OS) Off	Nominal Science Mode
RC LWIR FPA Heater	On (83K)	Nominal Science Mode
RC SMIR FPA Heater	Off	Nominal Science Mode
Scan Assembly	A On; B Off	Nominal Science Mode
SDSM	Off	Nominal Science Mode
SRCA	Off	Nominal Science Mode
PS1 Survival Heater	Enabled	Nominal Science Mode
PS2 Survival Heater	Enabled	Nominal Science Mode
Timing Generator	A On; B Off	Nominal Science Mode
Flight Software	Rev BD + 11 sets of patches CP07 to Survival Mode - No SDD to closed command (1 patch) CP07 to Safe Mode - No FR OFF Command (1 patch) CP07 to Safe Mode - No SDD to closed command (1 patch) CP07 to Science Mode - Turn on FRB instead of FRA (1 patch) CP07 to Outgas and Science Mode - Turn on FRB instead of FRA (1 patch) FR Error Counting and Statistics (2 patches) FR 1000ms time code patches (3 patches) FR Band 5 Gain Change (20 commands) FR BB Ideal Output Values (1 patch) FR A EEPROM KME Fast 1 word patch (1 patch) FR B EEPROM KME Fast 1 word patch (1 patch)	Nominal Science Mode
Inhibit Ids Set	none	Nominal Science Mode
TMON 66	Disabled	Nominal Science Mode
TMON 67	Disabled	Nominal Science Mode
TMON 68	Enabled	Nominal Science Mode
TMON 69	Disabled	Nominal Science Mode

This Week's Completed MODIS Activities:

Friday, October 31, 2003

Quarterly Memory Table Snapshots (Part 1)
2003/304 21:00:00-21:03:34 Real-Time MOD_MEM_DUMP('fpa_offset',550,0,0,1,18) [table 1]
2003/304 21:03:45-21:07:19 Real-Time MOD_MEM_DUMP('fpa_gain',550,0,0,1,18) [table 4]
2003/304 21:07:52-21:08:17 Real-Time MOD_MEM_DUMP('cp_rom_crc',24,0,0,1,1) [table 6]
2003/304 22:10:57-22:16:48 Real-Time MOD_MEM_DUMP('bb_output',1800,0,0,1,30) [table 5] [note 1]
2003/304 23:09:06-23:09:14 Real-Time MOD_MEM_HALT [note 1]
2003/304 23:09:59-23:10:44 Real-Time MOD_MEM_DUMP('bb_output',1800,0,0,28,30) [table 5] [note 1]
2003/304 23:11:31-23:12:01 Real-Time MOD_MEM_DUMP('sector_size',5,0,0,1,1) [table 7]

[note 1]
Commanding took slightly longer than anticipated for this load and the final 3 partitions were not dumped prior to the end of the contact. MOD_MEM_HALT was run on the next pass to clear the MODIS memory dump buffer. The final three partitions (of the first 30) were then dumped successfully.

Saturday, November 1, 2003

None

Sunday, November 2, 2003

None

Monday, November 3, 2003

Quarterly Memory Table Snapshots (Part 2)
2003/307 21:03:15-21:08:32 Real-Time MOD_MEM_DUMP('bb_output',1800,0,0,31,57) [table 5]

Tuesday, November 4, 2003

2003/308 21:31:41-21:40:29 ATC MOD_OA16_SDSM_SCRN_NO_DOOR_A.4 OA-16: SD/SDSM screened side A, no door movement.

Wednesday, November 5, 2003

Quarterly Memory Table Snapshots (Part 3)
2003/309 18:00:40-18:01:15 Real-Time MOD_MEM_DUMP('sector_definition',40,0,0,1,2) [table 8]
2003/309 18:01:23-18:01:46 Real-Time MOD_MEM_DUMP('cp_diagnostic',13,0,0,1,1) [table 9]
2003/309 18:01:59-18:02:26 Real-Time MOD_MEM_DUMP('fr_diagnostic',13,0,0,1,1) [table 10]
2003/309 19:02:53-19:04:34 Real-Time MOD_MEM_DUMP('cp_mode',250,0,0,1,8) [table 11]
2003/309 19:04:51-19:05:17 Real-Time MOD_MEM_DUMP('fp_rom_crc',24,0,0,1,1) [table 12]
2003/309 19:05:39-19:06:03 Real-Time MOD_MEM_DUMP('bb_weights_heater',12,0,0,1,1) [table 13]
2003/309 19:06:20-19:06:42 Real-Time MOD_MEM_DUMP('bb_weights_ace',12,0,0,1,1) [table 14]
2003/309 19:08:58-19:15:29 Real-Time MOD_MEM_DUMP('macro_31',1024,0,0,1,32) [table 15]
2003/309 19:16:03-19:16:40 Real-Time MOD_MEM_DUMP('motor_trigger_data',60,0,0,1,2) [table 17]
2003/309 19:43:04-19:49:15 Real-Time MOD_MEM_DUMP('detector_location',2048,0,0,1,32) [table 3]
2003/309 19:49:28-16:50:02 Real-Time MOD_MEM_DUMP('motor_constants',35,0,0,1,2) [table 16]
2003/309 19:50:07-19:50:30 Real-Time MOD_MEM_DUMP('motor_pos_when_hit',12,0,0,1,1) [table 18]
2003/309 21:22:44-21:28:44 Real-Time MOD_MEM_DUMP('detector_location',2048,0,0,33,64) [table 3]
2003/309 21:29:01-21:29:23 Real-Time MOD_MEM_DUMP('pc_sample_delays',6,0,0,1,1) [table 19]
2003/309 21:29:38-21:30:02 Real-Time MOD_MEM_DUMP('door_data',12,0,0,1,1) [table 20]

Thursday, November 6, 2003

None

Friday, November 7, 2003

None

This Week's Scheduled MODIS Activities Not Completed:

None

Upcoming MODIS Events:

Calibrations for November include bimonthly SRCA Full Spatial, monthly SRCA Full Radiometric, monthly 10W Radiometric, and weekly SD/SDSM. In addition, a full set of memory table dumps was gathered.

Tuesday, November 11, 2003

2003/315 21:38:38-21:47:25 ATC MOD_OA16_SDSM_SCRN_NO_DOOR_A.4 OA-16: SD/SDSM screened side A, no door movement
2003/315 22:27:28-22:51:59 ATC MOD_OA20_SRCA_10W_RAD_A.3 OA-20: SRCA 10W Continuous Radiometric - A Side, Using Lamp #1 Data collection is from 22:46:58-22:51:59 (in S/C Night)

Maneuvers:

The next Lunar Roll Calibration would occur on DOY 2003/218 (November 14, 2003). The maneuver has been declined based on concerns over predicted Leonid Meteor Shower activity.

Terra performed a DMU on Friday, October 31, 2003 (DOY 2003/304) at 18:13:33 GMT. "Low" and "High" Fidelity pointing times for the DMU were 2003/304 17:24:00 GMT and 2003/304 19:33:00 GMT, respectively.

MODIS Anomalies:

Terra Solid State Recorder Anomaly

Although not directly the result of a MODIS problem, the most recent Printed Wire Assembly (PWA) failures in the Terra Solid State Recorder (SSR) do affect MODIS data. See the Non-MODIS Significant Events section below for more details.

General Instrument Comments:

MODIS is in Science Mode, using all A-side components, but cross-strapped to Formatter B, with the blackbody maintained at 290K and the Solar Diffuser Door at the Screened position.

MODIS Telemetry Trends:

Nominal telemetry trending is ongoing.

Non-MODIS Significant Events:

Terra Solid State Recorder Anomaly

Overview:

The SSR Anomaly is still under investigation. MODIS currently is operating with 34 Supersets allotted for its buffer. There are currently no plans for power cycling the failed PWAs. There are no current plans for a change in science data capture rates.

Details:

Two Printed Wire Assemblies (PWA) in the Terra Solid State Recorder (SSR) have autonomously powered- down. The first shut down on September 24, 2003 (2003/267) at approximately 23:10 GMT. This PWA contains supersets #50 and #51 that are assigned as MODIS buffer locations. The second PWA shut down September 25, 2003 (2003/268) at 07:30 GMT. This second PWA contains supersets #114 and #115 that are assigned to the ASTER instrument. It is believed that over-current protection circuits in each PWA caused the PWA shutdowns.

The data written to these supersets while they were powered off are not recoverable. The four failed supersets were moved to the "bad" list and will no longer have data written to them. This reduced MODIS' total SSR buffer space from 36 supersets to 34 supersets and resulted in a short data loss while the transition was made.

Note that MODIS started the mission with 35 supersets of SSR space. A similar PWA failure occurred in May of 2001 (supersets #30 and #31) with the net result of MODIS gaining 1 superset (up to 36) when the SSR was recycled in June of 2001. It is believed that recycling the SSR will return all of the failed SSR supersets (currently 6) to working operation.

The final SSR playback before the PWA re-assignment was at 18:06:15 GMT on September 25, 2003 (2003/268). Science data recording to the SSR was stopped at 18:36:54 and re-enabled at 18:51:14. During this time, there will be no MODIS science data. For the period between 18:06:15 and 18:36:54, some or all of that MODIS data may be lost as well. The exact amount is not known at this time.

One superset was moved from the MISR buffer to the MODIS buffer at 12:22:17 GTM on September 30, 2003 (2003/273). This brings the count of supersets in the MODIS buffer to 35, its original count from mission start. Science Data recording during the reassignment was disabled between 12:16:29 and 12:28:25 GMT.

Another PWA failure occurred at 03:03 GMT on October 14, 2003 (2003/287). Both supersets in this PWA were allotted to the MODIS buffer. The two supersets (#42 and #43) in the failed PWA were removed from use later that day in the period 2003/287 19:07-19:14 GMT. During that time, science data recording was disabled. After that time, the MODIS allotment of supersets on the SSR became 33.

On Monday, October 20, 2003 (DOY 293) at 13:37:51, the FOT reassigned one of MISR's allotted supersets (#3) to the MODIS list, bringing the MODIS superset count to 34 and MISR to 18.

At this time, there are no plans to power-cycle the SSR to (hopefully) return all of the PWAs to working order because of other potential risks to the SSR during a power-cycle. The MODIS IOT has been asked to consider reducing its Science Data rate from the current orbital collection of 50% Day/50% Night to a 45/55 or 40/60 Day/Night rate. Such a reduction would aid the FOT in their replay management of the SSR buffers. Currently there are no plans to make this reduction. However, the MODIS IOT is taking steps to be prepared to support such a request, should it occur in the future. Additionally, further superset reassignments by the FOT to balance Science Data storage may be necessary, should additional PWA losses occur.

A brief timeline of the command activities follows:

Wednesday, September 24, 2003

2003/267 23:12:00 SSR PWA containing supersets 50 & 51 (MODIS) shut down

Note: About 5-1/2% MODIS data is lost until the supersets are moved to the "bad" list

Thursday, September 25, 2003

2003/268 07:37:00 SSR PWA containing supersets 114 & 115 (ASTER) shut down
2003/268 18:06:15 Last SSR playback before re-assigning failed supersets to the "bad list"
2003/268 18:36:54 Science recording to the SSR is disabled
2003/268 18:51:14 Science recording to the SSR is re-enabled

Note: Science data loss occurred while the recording was disabled. Some or all of the data since the last SSR playback may be lost as well.

Tuesday, September 30, 2003

2003/273 12:16:29 Science recording to the SSR is disabled
2003/273 12:17:25 Housekeeping recording to the SSR is disabled
2003/273 12:22:17 One MISR superset moved to MODIS
2003/273 12:28:25 Science recording to the SSR is re-enabled
2003/273 12:29:24 Housekeeping recording to the SSR is re-enabled

Tuesday, October 14, 2003

2003/287 03:03:00 SSR PWA containing supersets 42 & 43 (MODIS) shut down
2003/287 19:07:08 Science recording to the SSR is disabled
2003/287 19:14:15 Science recording to the SSR is re-enabled

Monday, October 20, 2003

2003/293 13:28:02 Science recording to the SSR is disabled
2003/293 One MISR superset moved to MODIS
2003/293 13:37:51 Science recording to the SSR is re-enabled

The EMOS mission status webpage (which includes instrument data loss records) can be found at the following URL. Note that a password is now required to access the EOS mission links web pages. There are directions at the URL below for how to obtain a username/password.

http://jupiter02.gsfc.nasa.gov/links/links.htm

Limited Life Item Status:

SRCA 10W Lamp #1: 221.9 of 500 hours
SRCA 10W Lamp #2: 163.0 of 500 hours
SRCA 10W Lamp #3: 172.2 of 500 hours
SRCA 10W Lamp #4: 62.2 of 500 hours

SRCA 1W Lamp #1: 564.6 of 4000 hours
SRCA 1W Lamp #2: 276.7 of 4000 hours

Solar Diffuser Door: 2146 of 3022 Movements
Nadir Aperture Door: 536 of 1316 Movements
Space View Door: 439 of 1316 Movements