ENVISAT Launch aboard an Ariane 5 into a Sun synchronous polar orbit at a height of 790 km (±10 km). It orbits the Earth in about 101 minutes with a repeat cycle of 35 days. Launched from Kourou, French Guiana The SODAP (Switch On and Data Acquisition Phase) starts today, with the switch-on of the Payload Module and Computer. March 09 2002 09:25GMT: AATSR was commanded into STANDBY mode from OFF for the first time since launch. The first data confirmed that the cooler was clamped as expected. March 09 2002 11:00GMT: The cooler was un-clamped and AATSR was configured for in-flight operations. March 12 2002 17:45GMT: AATSR commanded from STANDBY to HEATER mode.Electrical bus currents are all nominal. Equipment temperatures are within limits, orbital variation of cooler is as expected, giving rise to an increase in the anomaly counter. The BB heaters, SCC and Scan Mechanism are all off. March 15 09:37GMT: Scan mirror switched on. All telemetry confirms that the scan mirror is rotating and power consumption is within expected range. March 15 14:37GMT : First instrument source packets generated. March 15 17:46GMT: Commands for blackbody functional test uplinked. March 15 19:20GMT: BB heater ON. March 17: VISCAL pixel Map test. Visible channel gains updated following analysis of science data. March 26 09:15GMT: The instrument was restarted with the SCC cooling the FPA for the first time. March 26 10:39GMT: The scan mirror was restarted and the cooler set to maximum amplitudes. March 26 14:07GMT: The FPA reached 80K and AATSR automatically entered HEATER mode. The IR gains and offsets were being set by the auto-gain offset control loop. March 26 15:43GMT: AATSR was commanded back into measurement mode. March 28 10:14GMT: 1.6 channel gain set to fixed value and offset controlled by Auto-Offset control loop. AATSR in HEATER mode. April 03 08:26GMT: AATSR was commanded into HEATER mode with the cooler drives at zero amplitude and the scan mirror switched off in preparation for the ENVISAT orbit control manoeuvre. April 08 15:34GMT: The second cool-down of the IR channels was started. The detectors were at a temperature of 80K within 5 hours of commanding the cooler. AATSR in MEASUREMENT mode. April 12 08:34GMT: The scan mechanism was restarted, the auto-gain-offset loop re-enabled and AATSR was commanded back into MEASUREMENT mode. April 12 11:57 The cooler was commanded to run at a fixed compressor amplitude setting of 7D hex for the first part of the cooler optimisation procedure. April 15 08:45GMT: The cooler was commanded to zero amplitude for one orbit for part 5 of SDP-3.3 April 15 11:59GMT: The instrument entered Standby/Refuse mode due to the cooler body temperature dropping below the lower switchdown limit of -10C. April 17 11:02GMT: AATSR commanding was re-enabled and cooler compressor and displacer amplitude initial settings commanded. Transition to Heater mode could not be started because the Cooler Bodfy Temperature remained below the switch-on condition of -8C and rising during passes. April 18 17:37GMT: The Heater mode command was executed and AATSR immediately returned to Standby/Refuse mode. The immediate cause was a command echo failure. April 19: An Anomaly Review Board was held to agree a recovery plan for AATSR and identify further investigations. Memory Dump of the RAM area was taken and the instrument returned to Standby mode. April 19 17:03GMT: A further attempt to return to Heater mode was made but resulted in AATSR immediately returning to Standby/Refuse mode. April 23: AATSR Recovery Procedure AATSR-IOR-0009 11:13 AATSR ICU reset and returned to STANDBY mode 12:53 Cooler initial amplitudes sent 15:00 AATSR transition to HEATER mode started 16:11 Cooler default amplitudes sent 19:33 AATSR in HEATER mode April 24 07:26 Scan mirror started; 07:27 AATSR in MEASUREMENT mode; visible channel ayuto-offeset loops not enabled and signal channels at hardware default gain settings April 26: AATSR in MEASUREMENT mode 13:00 Visible channel auto offset loop enabled and visible channel gains commanded AATSR OFF due to ENVISAT PL-SOL for all instruments Payload in SUSPEND due to Level 3 PROTOCOL INTERRUPT No data No impact on data. Envisat SFCM Orbit Maintenance Manoeuvre No impact on data. Envisat SFCM Orbit Maintenance Manoeuvre TBD No data. Envisat OCM Out-of-Plane Orbit Inclination Maintenance Manoeuvre then Envisat FCM Orbit Maintenance Manoeuvre No impact on data. Envisat SFCM Orbit Maintenance Manoeuvre No impact on data. Envisat SFCM Orbit Maintenance Manoeuvre No impact on data. Envisat SFCM Orbit Maintenance Manoeuvre No data No impact on data. Envisat SFCM Orbit Maintenance Manoeuvre No data.Envisat OCM out-of-plane Orbit Inclination Maintenance Manoeuvre. Envisat SFCM Orbit Maintenance Manoeuvre AATSR Telemetry Parameter A3511 momentarily OOL No impact on data. Envisat SFCM Orbit Maintenance Manoeuvre. No data No impact on data. Envisat SFCM Orbit Maintenance Manoeuvre No data. ENVISAT Command Procedure Failure; all instruments commanded OFF then Envisat OCM out-of-plane Orbit Inclination Maintenance Manoeuvre No impact on data No data. ENVISAT anomaly. All instruments off. No data No data. Spacecraft Maintenance/Instrument Switchoff/Instrument Recovery. No data TBD TBD No data. AATSR OFF due to ENVISAT PL-SOL for all instruments No data. AATSR into HEATER mode for Envisat Out-of-Plane Manoeuvre. No data. AATSR out-gassing pocedure begins. IR channels OFF No data. Envisat PL-SOL: AATSR and all other instruments OFF No data. Orbital Correction Manoeuvre (OCM) No data. Orbital Correction Manoeuvre (OCM) No data TBD Data impaired. Blackbody crossover tests. Auto Gain Offset Loop restarted, Instrument in Nominal Operation. No data No data No data. Outgassing begins as planned in orbit #12529. No data. Orbital Correction Manoeuvre (OCM) No data. AATSR in HEATER mode for OCM No data. Outgassing begins as planned in orbit #14233. No data. Orbital Correction Manoeuvre (OCM) No data. Orbital Correction Manoeuvre (OCM) No data. Coolers commanded off. Outgassing begins as planned in orbit #16236 Data impaired. Black-body cross-over test. Reflectance channels gains update commanded No data. Coolers commanded off. Outgassing begins as planned in orbit #18183. No data. AATSR into HEATER mode for Orbital Correction Manoeuvre (OCM) No data. Coolers commanded off. Outgassing begins as planned in orbit #19844. No data. AATSR into HEATER mode for ENVISAT Orbital Correction Manoeuvre (OCM). No data. AATSR into HEATER mode for ENVISAT Orbital Correction Manoeuvre (OCM). No data. Spacecraft anomaly. ENVISAT down - AATSR OFF No data No data Data impaired. Black-body Cross-Over Test No data. AATSR in Reset/Wait,anomaly under investigation. No data. AATSR OFF owing to ENVISAT AOCS STD-A anomaly. No data. Orbital Correction Manoeuvre (OCM) No data. AATSR to OFF following Envisat memory maintenance anomaly. No data. AATSR unavailable due to an Envisat LVL3 PROTOCOL ERROR AND INTERRUPT . No data. AATSR to HEATER Mode during ENVISAT Orbital Correction Manoeuvre (OCM). No data. AATSR to HEATER Mode during ENVISAT Orbital Correction Manoeuvre (OCM). No data. Cooler off - AATSR out-gassing. No data. Orbital Correction Manoeuvre (OCM) No data. AATSR OFF following payload switch-off due to Service Module Anomaly (Global AOCS Surveillance triggered).