1. Revision 1MODIS FM1 (Aqua) SRCA Anomaly, 2005-137 1 MODIS IOT: Bryan Breen & Tony Salerno

2. Revision 1MODIS FM1 (Aqua) SRCA Anomaly, 2005-137 2 Description of Event On DOY 2005/137 at 01:07:30, during the 20W portion of the SRCA Full Spatial calibration, there was an abnormal output from the lamps. –Initial SRCA Setup commands executed as expected –Calibrations 16 minute warm up executed as expected –30W calibration (10 minutes) executed as expected –With 2 minutes remaining in the 20W calibration (10 minutes), lamp currents and voltages went to zero –10W calibration (10 minutes) did not execute as expected, lamp currents and voltages did not rise above zero –1W calibration (10 minutes) did not execute as expected, lamp currents and voltages did not rise above zero –SRCA Slit and Filter movements did execute as expected through entire calibration

3. Revision 1MODIS FM1 (Aqua) SRCA Anomaly, 2005-137 3 Elaboration of Planned Event SRCA Full Spatial calibrations normally consist of the following: –MODIS MCL SRCA Setup Commands: Turn on SRCA B –2005/137 00:20:00 MOD_TURN_ON_SRB Set SRCA Lamp Over Voltage Shutdown to Enable –2005/137 00:20:03 MOD_SET_SR_LOV_SHDN TO=ENABLE Set SRCA SIS Feedback Control to Radiance –2005/137 00:20:06 MOD_SET_SR_SIS_FB TO=RADIANCE Set SRCA 30W Lamp Configuration –2005/137 00:20:09 MOD_SET_SR_L10WX3 TO=L_1_3_4 Set SRCA 20W Lamp Configuration –2005/137 00:20:11 MOD_SET_SR_L10WX2 TO=L_3_4 Set SRCA 10W Lamp Configuration –2005/137 00:20:13 MOD_SET_SR_L10WX1 TO=L_1 Set SRCA 1W Lamp Configuration –2005/137 00:20:15 MOD_SET_SR_L1WX1 TO=L_5 –MODIS MCL Activate ISC SCS 60 – SRCA Full Spatial: Run MODIS CP Macro 23 (the only command in ISC SCS 60) –2005/137 00:33:08 ISC_ACTIVATE_GENSCS SCSID=60 »PM1_SCS_ISC_60_MOD_OA23_SRCA_FULL_SPAT

4. Revision 1MODIS FM1 (Aqua) SRCA Anomaly, 2005-137 4 MODIS CP Macro 23 (SRCA Full Spatial) Commands 2005-137-00:33:11 SET MOD SR_IR_SRC TO OFF 2005-137-00:33:11 SET MOD SR_SIPD_HTR TO OFF 2005-137-00:33:11 SET MOD SR_LAMPLEVEL TO HIGH 2005-137-00:33:11 STEP MOD SR_WHEEL BY 6 FORWARD 2005-137-00:33:14 GET MOD CP_MTR_HOME WITH MTR 5, DIR 0 2005-137-00:33:29 STEP MOD SR_SLIT BY 6 FORWARD 2005-137-00:33:32 GET MOD CP_MTR_HOME WITH MTR 6, DIR 0 2005-137-00:33:46 STEP MOD SR_GRT BY 6 FORWARD 2005-137-00:33:49 GET MOD CP_MTR_HOME WITH MTR 7, DIR 0 2005-137-00:34:04 SET MOD SR_IR_SRC TO ON 2005-137-00:34:04 STEP MOD SR_WHEEL BY D#080 FORWARD 2005-137-00:34:04 SET MOD SR_SIPD_HTR TO ON 2005-137-00:49:05 SET MOD FR_SR_DELAY TO 0 2005-137-00:49:05 SET MOD SR_LAMPS TO W30 2005-137-00:52:59 SET MOD FR_SR_DELAY TO 10 2005-137-00:53:55 SET MOD FR_SR_DELAY TO 20 2005-137-00:54:51 SET MOD FR_SR_DELAY TO 30 2005-137-00:55:47 SET MOD FR_SR_DELAY TO 40 2005-137-00:56:43 SET MOD FR_SR_DELAY TO 50 2005-137-00:57:39 SET MOD FR_SR_DELAY TO 0 2005-137-00:57:42 STEP MOD SR_SLIT BY 24 BACKWARD 2005-137-00:59:17 SET MOD SR_LAMPS TO W20 2005-137-01:03:10 STEP MOD SR_SLIT BY 24 FORWARD 2005-137-01:04:45 SET MOD FR_SR_DELAY TO 10 2005-137-01:05:41 SET MOD FR_SR_DELAY TO 20 2005-137-01:06:37 SET MOD FR_SR_DELAY TO 30 2005-137-01:07:33 SET MOD FR_SR_DELAY TO 40 2005-137-01:08:29 SET MOD FR_SR_DELAY TO 50 2005-137-01:09:25 SET MOD FR_SR_DELAY TO 0 2005-137-01:09:28 SET MOD SR_LAMPS TO W10 2005-137-01:13:21 SET MOD FR_SR_DELAY TO 10 2005-137-01:14:18 SET MOD FR_SR_DELAY TO 20 2005-137-01:15:14 SET MOD FR_SR_DELAY TO 30 2005-137-01:16:10 SET MOD FR_SR_DELAY TO 40 2005-137-01:17:06 SET MOD FR_SR_DELAY TO 50 2005-137-01:18:02 SET MOD FR_SR_DELAY TO 0 2005-137-01:18:05 STEP MOD SR_SLIT BY 24 BACKWARD 2005-137-01:19:40 SET MOD SR_LAMPS TO OFF 2005-137-01:19:56 SET MOD SR_LAMPS TO W1 2005-137-01:23:49 STEP MOD SR_SLIT BY 24 FORWARD 2005-137-01:25:24 SET MOD FR_SR_DELAY TO 10 2005-137-01:26:20 SET MOD FR_SR_DELAY TO 20 2005-137-01:27:16 SET MOD FR_SR_DELAY TO 30 2005-137-01:28:12 SET MOD FR_SR_DELAY TO 40 2005-137-01:29:08 SET MOD FR_SR_DELAY TO 50 2005-137-01:30:04 SET MOD FR_SR_DELAY TO 0 2005-137-01:30:07 SET MOD SR_LAMPS TO OFF 2005-137-01:30:24 SET MOD SR_MTR_GRP WITH WH 1, SL 1, GR 0 2005-137-01:31:21 TURN OFF MOD SR 2005-137-01:31:21 CLOSE MOD CP_MACRO

5. Revision 1MODIS FM1 (Aqua) SRCA Anomaly, 2005-137 5 Actions Taken Telemetry Analysis: –2005-137 anomalous SRCA Full Spatial –2005-076 previous (successful) SRCA Full Spatial Contacted: –Aqua FOT Bill Guit, Joe Purcell, John Nidhiry –MCST Jack Xiong, Nianzeng Che, David Moyer –Instrument Provider (SBRS) Roger Drake and Joe Auchter –MODIS Science Team Vincent Salomonson

6. Revision 1MODIS FM1 (Aqua) SRCA Anomaly, 2005-137 6 Current Understanding of Possible Cause(s) Lamp Failure? –Unlikely that one or both of the 10W lamps #3 and #4 failing would effect the unpowered 10W lamp #1 and 1W lamp #5 (primary 1W). Total SRCA Failure? –No. Continued functioning of the SRCA motors and active thermal sensors indicate the SRCA is functioning (at some level). Lamp Over Voltage tripped protection circuitry/software? –Most likely explanation –Over Voltage protection cuts power to the lamp ring effecting all lamps, the remaining functions of the SRCA are unaffected fits observed telemetry Awaiting SBRS confirmation of Over Voltage Protection sequence –Over Voltage protection is a soft lock up, it is reset when power to the SRCA is cycled SRCA B is currently off (as per final command in the CP Macro 23)

7. Revision 1MODIS FM1 (Aqua) SRCA Anomaly, 2005-137 7 Immediate Plan of Action Assess state of health of the instrument Explore scenarios of SRCA lamps being disabled while remaining SRCA equipment remains functional –Inquiry requested of SBRS regarding this issue Joe Auchter is reviewing the SRCA Lamp Over Voltage Protection Software Determine impact on science data from the loss of the planned SRCA Full Spatial Calibration and any future SRCA calibrations –Inquiry requested of MCST regarding this issue Suspension of future SRCA activities until course of resolution has been determined. –The next regularly scheduled SRCA activity was to be an SRCA Full Radiometric calibration in the first week of June.

8. Revision 1MODIS FM1 (Aqua) SRCA Anomaly, 2005-137 8 System Experts Contacted or Needed MODIS Flight Software: Joe Auchter of SBRS MODIS Overall System Design: Roger Drake of SBRS Additional? – unknown at present

9. Revision 1MODIS FM1 (Aqua) SRCA Anomaly, 2005-137 9 Impact to Science Data Immediate effects are minimal Effect from loss of 2005-137 SRCA Full Spatial –Last successful SRCA Full Spatial (bimonthly schedule) was conducted on 2005-076 –? Effect of short term suspension of SRCA activities –? Effect of possible loss of all future SRCA activities –?

10. Revision 1MODIS FM1 (Aqua) SRCA Anomaly, 2005-137 10 Course of Action Additional telemetry analysis? –Awaiting recommendations for any additional data to analyze outside of the current set of processed data. Tests to conduct? –Power on the SRCA Power 1 or more 10W and 1W lamps? Move SRCA motors (Filter, Grating, Slit)? –Switch to backup SRCA A? Highly discouraged – requires swap to PS1 –SRCA circuitry is not fully redundant – tied to same side power supply –Pursue only after all other options have been tried/eliminated

11. Revision 1MODIS FM1 (Aqua) SRCA Anomaly, 2005-137 11 Available Action Options (Real-Time Commands) Real-Time Procedures –MOD_SRCA_SETUP - power on and configure the SRCA –MOD_SRCA_LAMPS - turns on and off any configuration of the lamps –MOD_SRCA_PM_OFF - power off the SRCA –MOD_SRCA_IR_SRC - turn the IR source on/off –MOD_SRCA_GRAT_BURST - moves the grating in bursts –MOD_SRCA_HOME - turns on the SRCA, moves the motors home, turns off the SRCA –MOD_SRCA_MOTOR_GROUP - moves the SRCA motors to specified positions –MOD_STEP_MOTOR - moves the SRCA motors specific step counts

12. Revision 1MODIS FM1 (Aqua) SRCA Anomaly, 2005-137 12 Available Action Options (MCL Activities) MOD_OA20_SRCA_10W_RAD MOD_OA20_SRCA_10W_RAD_CUR MOD_OA21_SRCA_1W_RAD MOD_OA21_SRCA_1W_RAD_CUR MOD_OA22_SRCA_FULL_SPECT_1 MOD_OA22_SRCA_FULL_SPECT_2 MOD_OA22_SRCA_FULL_SPECT_3 MOD_OA22_SRCA_FULL_SPECT_4 MOD_OA23_SRCA_FULL_SPAT MOD_OA23_SRCA_FULL_SPAT_ND MOD_OA23_SRCA_SPAT_01KM_P1V1 MOD_OA23_SRCA_SPAT_01KM_P2V1 MOD_OA24_SRCA_ASCAN_SPAT MOD_OA25_SRCA_10W_SPAD_ND MOD_OA25_SRCA_1W_SPAD MOD_OA25_SRCA_1W_SPAD_ND MOD_OA30_SRCA_XTALK_TEST1_1B MOD_OA30_SRCA_XTALK_TEST1_2B MOD_OA30_SRCA_XTALK_TEST1_3B MOD_OA30_SRCA_XTALK_TEST2_1B MOD_OA30_SRCA_XTALK_TEST2_2B MOD_OA30_XTALK_TEST3_1B MOD_OA30_XTALK_TEST3_2B MOD_SRCA_OFF MOD_SRCA_SETUP MOD_SRCA_SETUP_10WL2_1WL6 MOD_SRCA_SETUP_10W_L2 MOD_SRCA_SETUP_10W_L3 MOD_SRCA_SETUP_10W_L4 MOD_SRCA_SETUP_NO_L2 MOD_SRCA_SPECIAL_10WND MOD_SRCA_SPECIAL_10W_OPEN

13. Revision 1MODIS FM1 (Aqua) SRCA Anomaly, 2005-137 13 Available Action Options (Stored Commands) ISC SCSes: –PM1_SCS_ISC_59_MOD_OA19_SRCA_FULL_RAD –PM1_SCS_ISC_60_MOD_OA23_SRCA_FULL_SPAT –PM1_SCS_ISC_63_MOD_OA25_SRCA_1W_SPAT –PM1_SCS_ISC_72_MOD_OA20_SRCA_10W_RAD –PM1_SCS_ISC_73_MOD_OA20_SRCA_10W_RAD_CUR –PM1_SCS_ISC_74_MOD_OA21_SRCA_1W_RAD_V2 –PM1_SCS_ISC_75_MOD_OA21_SRCA_1W_RAD_CUR_V2 –PM1_SCS_ISC_76_MOD_OA22_SRCA_FULL_SPECT_1 –PM1_SCS_ISC_77_MOD_OA22_SRCA_FULL_SPECT_2 –PM1_SCS_ISC_78_MOD_OA22_SRCA_FULL_SPECT_3 –PM1_SCS_ISC_79_MOD_OA22_SRCA_FULL_SPECT_4 –PM1_SCS_ISC_80_MOD_OA24_SRCA_ASCAN_SPAT –PM1_SCS_ISC_151_MOD_OA25_SRCA_10W_SPAT_ND –PM1_SCS_ISC_151_MOD_OA25_SRCA_1W_SPAT_ND –PM1_SCS_ISC_201_MOD_OA23_SRCA_FULL_SPAT_ND

14. Revision 1MODIS FM1 (Aqua) SRCA Anomaly, 2005-137 14 Future Anomaly Resolution Team Meetings Meetings Held: Meetings Planned: –2005-140 (May 20) 09:00 EDT – Cherry Room

15. Revision 1MODIS FM1 (Aqua) SRCA Anomaly, 2005-137 15 Supporting Analysis Data CP Command Echo: MOD_SS_CP_CMD_ECHO(RAW:HEX) 2005-137-00:00:00 6117formatter night 2005-137-00:20:02 184Fturn on SRCA B 2005-137-00:20:05 6149enable lamp over voltage shutdown 2005-137-00:20:08 6148set SIS feedback to radiance 2005-137-00:20:11 6112set 30W configuration 2005-137-00:20:14 6113set 20W configuration 2005-137-00:20:16 6114set 10W configuration 2005-137-00:20:17 6115set 1W configuration 2005-137-00:33:11 C017run macro 23 2005-137-00:41:24 6117formatter day