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MODIS FM1 (Aqua) SRCA Anomaly, 2005-137

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

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MODIS FM1 (Aqua) SRCA Anomaly, 2005-137

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  1. MODIS FM1 (Aqua)SRCA Anomaly, 2005-137 MODIS IOT: Bryan Breen & Tony Salerno MODIS 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 • Calibration’s 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 MODIS 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 MODIS 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 MODIS 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 MODIS 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) MODIS 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. MODIS 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 MODIS 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 • ? MODIS 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 MODIS 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 MODIS 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 MODIS 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 MODIS 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 MODIS 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 6117 formatter night 2005-137-00:20:02 184F turn on SRCA B 2005-137-00:20:05 6149 enable lamp over voltage shutdown 2005-137-00:20:08 6148 set SIS feedback to radiance 2005-137-00:20:11 6112 set 30W configuration 2005-137-00:20:14 6113 set 20W configuration 2005-137-00:20:16 6114 set 10W configuration 2005-137-00:20:17 6115 set 1W configuration 2005-137-00:33:11 C017 run macro 23 2005-137-00:41:24 6117 formatter day MODIS FM1 (Aqua) SRCA Anomaly, 2005-137

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