MODIS IOT Terra Weekly Report

Mission Operations Days: 2002/194 to 2002/200
July 12, 2002 20:00:00 GMT to July 19, 2002 20:00:00 GMT

Terra Spacecraft and MODIS Instrument Status:

This Week's Completed MODIS Activities:

None

None

2002/196 12:21:25 Real-Time MOD_MEM_HALT was executed to clear the FR event 1B message.

None

2002/198 21:42:26 ATC OA16: SD/SDSM SCREENED FXD, side A
2002/198 22:30:02 ATC OA19: SRCA Full Radiometric, side A
2002/198 23:21:20 ATC OA15: SD/SDSM OPEN FXD, side A

None

None

This Week's Scheduled MODIS Activities Not Completed:

None

Upcoming MODIS Events:

Bi-monthly SRCA spatial, and quarterly SRCA spectral and blackbody calibrations.

2002/210 MODIS Lunar Roll of -7.7199 degrees

Maneuvers:

The next Terra MODIS Lunar Calibration Roll is scheduled for 2002/210 (July 29, 2002), from 05:11:33 to 05:18:03 GMT (6 minutes 30 seconds data collection period) with a roll angle of -7.7199 degrees.

The sixth Terra inclination adjust maneuver has been pushed back to an unspecified date in September to facilitate Lockheed Martin development at Valley Forge for products to support long term planning of possible future inclination maneuvers.

The Terra Deep Space Calibration Maneuver is still postponed. The maneuver date is not expected until late summer of 2002.

MODIS Anomalies:

The current patches loaded into the MODIS Formatter, record the number of formatter error events, but not the address where they occurred. The error rate was last noted at nearly 33 million errors per day.

A patch was attempted on Tuesday, June 18th, 2002 to prevent the occurrence of register load from every pass through the flight software background task. This software address with this register load had previously been associated with over 80% of the formatter errors. The patch was successfully loaded (and the contents verified by a memory dump), but there was no discernable decrease in the error rate.

Intermittent bad frame count formatter event messages (xx1B) are being observed. This is one of the event messages being used to warn of potential impacts to the science data. The MODIS halt memory transfer command is being sent after each 1B-event message. This command triggers both a CP and FR event message and thus "clears" the current MOD_SS_FR_LAST_EVENT message of the xx1B value.

The most recent error tracking spreadsheets can be retrieved from:

An MS Excel spreadsheet called, AM1_FR_error_rollovers_current.xls contains the data for the times each error count "roll over" occurs.

General Instrument Comments:

MODIS is in A-side Science Mode with the blackbody maintained at 290K.

MODIS Telemetry Trends:

All systems appear to be functioning properly. Tracking of the Formatter Error Rate is continuing.

Non-MODIS Significant Events:

Science Data Loss Reports can be viewed at:

Select "Search Data Losses" and choose Data Type: MOD

Then press the big SUBMIT button.

Limited Life Item Status:

SRCA 10W Lamp #1: 200.8 of 500 hours
SRCA 10W Lamp #2: 152.6 of 500 hours
SRCA 10W Lamp #3: 161.8 of 500 hours
SRCA 10W Lamp #4: 61.5 of 500 hours

SRCA 1W Lamp #1: 559.8 of 4000 hours
SRCA 1W Lamp #2: 276.3 of 4000 hours

Solar Diffuser Door: 1883 of 3022 Movements
Nadir Aperture Door: 536 of 1316 Movements
Space View Door: 439 of 1316 Movements

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Email the MCST Helpdesk to ask a question about Level 1B usage, algorithms or software.

Last Update: Thursday, 04-Sep-2003 18:14:23 EDT