MODIS IOT Terra Weekly Report

Mission Operations Days: 2004/038 through 2004/044
February 6, 2004 20:00:00 GMT to February 13, 2004 20:00:00 GMT

Terra Spacecraft and MODIS Instrument Status:

This Week's Completed MODIS Activities:

None

None

None

2004/041 18:54:49-18:57:20 ATC MOD_OA27_PV_ECAL.3 OA-27: PV ECAL
2004/041 19:47:00 RT FOT places Terra in Low Fidelity Pointing Mode
2004/041 20:34:52 ATC MOD_OA03_FR_NIGHT_RATE (03:23 early)
2004/041 20:42:59-20:49:48 ATC MOD_OA08_ROLL_MAN PFM Lunar Calibration (-7.5597 roll)
2004/041 21:19:20-21:28:08 ATC MOD_OA16_SDSM_SCRN_NO_DOOR_A.4 OA-16: SD/SDSM screened side A, no door movement.
2004/041 21:30:22 RT FOT places Terra in High Fidelity Pointing Mode
2004/041 21:31:04 ATC MOD_OA03_FR_DAY_RATE (03:23 late)
2004/041 22:15:00-22:15:31 ATC MOD_SRCA_NOMINAL_SETUP.4 Setup of nominal lamp configuration for SRCA calibration
2004/041 22:16:18-22:51:28 ATC MOD_OA19_SRCA_FULL_RAD_A.6 OA-19: SRCA Full Radiometric Calibration Data collection from 22:32:12-22:51:28

None

None

None

This Week's Scheduled MODIS Activities Not Completed:

None

Upcoming MODIS Events:

Upcoming February calibrations include weekly SDSM SCREENED, SRCA Full Radiometric, SRCA 10W Radiometric, PV Ecal, and Lunar Calibration. A special request has also been made for a 20 minute Formatter Day Rate over Groundtrack Night collection along the Southern African Coast.

2004/048 21:24:33-21:33:21 ATC MOD_OA16_SDSM_SCRN_NO_DOOR_A.4 OA-16: SD/SDSM screened side A, no door movement
2004/048 22:28:00-22:28:30 ATC MOD_SRCA_NOMINAL_SETUP.4 Sets up nominal SRCA lamp configuration
2004/048 22:28:53-22:49:48 ATC MOD_OA20_SRCA_10W_RAD_A_Base.2 OA-20: SRCA 10W Continuous Radiometric - A Side, Using Lamp #1 Data Collect Centered on S/C Night (22:44:47-22:49:48)

20 minute Formatter Day Rate over Groundtrack Night (Viewing South-Western African Coast)
2004/049 21:16:49 ATC MOD_OA04_NIGHT_RATE.1 OA-04: Formatter to Night Rate (10 min before groundtrack night)
2004/049 21:42:00 ATC MOD_OA03_DAY_RATE.2 OA-03: Formatter to Day Rate (night ground track)
2004/049 22:02:00 ATC MOD_OA04_NIGHT_RATE.1 OA-04: Formatter to Night Rate (return to normal night rate)
2004/049 22:26:15 ATC MOD_OA03_DAY_RATE.2 OA-03: Formatter to Day Rate (10 min after groundtrack day)

Maneuvers:

The next Lunar Calibration will occur on DOY 2004/070 (March 10, 2004), with a data collect time from 23:27:40 to 23:34:10. The necessary roll angle is -19.4329 degrees. The MODIS data will be adjusted for Day Rate and Sector Rotation as is standard for a Lunar Calibration.

MODIS Anomalies:

MODIS NAD (Nadir Aperture Door) Anomaly:

Telemetry still indicates that the “NAD Open” (MOD_CR_DR_NAD_OPEN) trigger is set to the “NOT_OPEN” position; however, science data has shown that the NAD is open. The NAD OPEN trigger may yet “pop” to OPEN due to thermal cycling on the trigger, as was seen on 2002/079.

Terra SSR 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 plans in the works for possibly power cycling the SSR to get back PWA's that are in the Bad List, but no date has yet been set. There are no current plans for a change in science data capture rates. For details, see previous reports.

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: 225.9 of 500 hours
SRCA 10W Lamp #2: 165.3 of 500 hours
SRCA 10W Lamp #3: 174.5 of 500 hours
SRCA 10W Lamp #4: 62.2 of 500 hours

SRCA 1W Lamp #1: 565.2 of 4000 hours
SRCA 1W Lamp #2: 276.7 of 4000 hours

Solar Diffuser Door: 2146 of 3022 Movements
Nadir Aperture Door: 538 of 1316 Movements
Space View Door: 441 of 1316 Movements

Email the MODIS IOT to report any problem with the MODIS IOT Web Pages.
Email the MCST Webmaster to report any problem with the MCST Web Pages.
Email the MCST Helpdesk to ask a question about Level 1B usage, algorithms or software.

Last Update: Friday, 30-Jul-2004 10:10:12 EDT