UVCS MISSION LOG ---------------- Date: 10 March 2006 ----- Last revision: 28 March 2006 (Wu) -------------- File Name: 2006.03.16.a.log ---------- Compiled by: R. Wu ------------ UVCS Activity: UVCS in Modified Hard Safe Configuration -------------- Recover UVCS from a Modified Hard Safe Configuration into a Soft Safe Configuration Conduct OVI Stimulus Pulse Test UVCS in Soft Safe Configuration with OVI Detector Powered On and High Voltage Powered Off Load OVI Detector Mask OVI_MPM_232 into OVI slot 4 SOHO Activity: -------------- EOF Staff: M. Uzzo: Lead Scientist ---------- M. Uzzo: Commander Y.-K. Ko R. Wu Command file: 06.03.16.16:20:01.cmd.log Activity: --------- 1) UVCS in Modified Hard Safe Configuration Sequence: None SCI_SPEC: Following completion of Science Observations, UVCS is placed into a modified Hard Safe configuration in preparation for the SOHO High Gain Antenna Keyhole Period of March 2006. OVI Slit is set to 100 microns, instrument is rolled to nominal North East (30475 Engineering Units) to protect OVI detector electronics. Detector High Voltage is ramped down and then turned off. The Mirror is moved to 1.5 Solar Radii with 1.5 mm overocculting. UVCS Aperture Door is also closed 708 steps, Internal Mirror / Occulter Heater set to 100% duty cycle (64). Internal Spectrometer Heater is approximately 25% (192). For the last part of the keyhole following the 23.5 hour gap both OVI and LYA detectors are powered ON to provide thermal energy. FOT use ESR Limit Set, and leave TSU Substitution Heater (Circuit #84) OFF while both detectors are powered ON. Experiment Offpoint and ESR Flags disabled for Keyhole. Note: Times are approximate. OBS_PROG: SCI_OBJ: OBJ: CMP_NAME: CMP_NUM: Duration: start: 2006.03.16.17:00 end: 2006.03.16.17:52 ONUMs = 22284 Instrument configuration: - Pointing: Sun center - Spacecraft Roll: 0 Degrees - Roll: 64.3 Degrees (30475) - Mirror/Occulter: 1.5 Ro 1.5 mm overocculting - LYA Slit: 100 um - OVI Slit: 100 um - LYA GRTPOS: 100000 - OVI GRTPOS: 164600 - LYA HIGH VOLTAGE RAMPED DOWN AND POWERED OFF - OVI HIGH VOLTAGE RAMPED DOWN AND POWERED OFF - VLD HIGH VOLTAGE RAMPED DOWN AND POWERED OFF - LYA DETECTOR POWERED ON - OVI DETECTOR POWERED ON - VLD DETECTOR POWERED OFF - LYA mask: Star_LYA_6x4 in slot 4 - OVI mask: OVI_JOP175 in slot 5 Fits Files: 2) Recover UVCS from Modified Hard Safe Configuration Sequence: Manual SCI_SPEC: UVCS is recovered from Hard Safe Configuration into a Soft Safe configuration in order to allow UVCS temperatures to return to nominal. Detector High Voltage remains ramped down and turned off and LyA Detector is powered OFF completely at this time. OVI Slitwidth is 100 microns, instrument is rolled to nominal North East (30475 Engineering Units) to protect OVI detector electronics. Detector High Voltage is ramped down and then turned off. The Mirror is moved to 1.5 Solar Radii with 1.5 mm overocculting. UVCS Aperture Door is opened at this time, Internal Mirror / Occulter Heater set to 0% duty cycle (255). Internal Spectrometer Heater is also set to 0% duty cycle (255). OVI Detecor Timing and Charge Thresholds set. FOT told to continue to use UVCS ESR Limit Set. FOT component of UVCS recovery, including enabling of the Experiment Offpoint and ESR Warning Flags, completed at approximately 18:56 UT. Note: Times are approximate. OBS_PROG: SCI_OBJ: OBJ: CMP_NAME: CMP_NUM: Duration: start: 2006.03.16.17:52 end: 2006.03.16.18:10 ONUMs = 22284 Instrument configuration: - Pointing: Sun center - Spacecraft Roll: 0 Degrees - Roll: 64.3 Degrees (30475) - Mirror/Occulter: 1.5 Ro 1.5 mm overocculting - LYA Slit: 100 um - OVI Slit: 100 um - LYA GRTPOS: 100000 - OVI GRTPOS: 164600 - LYA HIGH VOLTAGE RAMPED DOWN AND POWERED OFF - OVI HIGH VOLTAGE RAMPED DOWN AND POWERED OFF - VLD HIGH VOLTAGE RAMPED DOWN AND POWERED OFF - LYA DETECTOR POWERED OFF - OVI DETECTOR POWERED ON - VLD DETECTOR POWERED OFF - LYA mask: Star_LYA_6x4 in slot 4 - OVI mask: OVI_JOP175 in slot 5 Fits Files: 3) UVCS OVI Stimulus Pulse Test Sequence: Manual SCI_SPEC: OBS_PROG: SCI_OBJ: OBJ: CMP_NAME: CMP_NUM: Duration: start: 2006.03.16.18:10 end: 2006.03.16.18:14 ONUMs = 22285 (2 exps) Instrument configuration: - Pointing: Sun Center - Spacecraft Roll: 0 Degrees - Roll: 64.3 Degrees (30475) - Mirror/Occulter: 1.5 Ro 1.5 mm overocculting - LYA Slit: 100 um - OVI Slit: 100 um - LYA GRTPOS: 100000 - OVI GRTPOS: 164600 - LYA HIGH VOLTAGE RAMPED DOWN AND POWERED OFF - OVI HIGH VOLTAGE RAMPED DOWN AND POWERED OFF - VLD HIGH VOLTAGE RAMPED DOWN AND POWERED OFF - LYA DETECTOR POWERED OFF - VLD DETECTOR POWERED OFF - OVI mask: msk_000303_OVI in slot 3 Fits Files: q06.03.16.18:08:42.ovi.dat 4) Thermal Equilibration of UVCS in Soft Safe Configuration Sequence: none SCI_SPEC: UVCS is recovered from Hard Safe Configuration into a Soft Safe configuration in order to allow UVCS temperatures to return to nominal. Detector High Voltage remains ramped down and turned off. OVI Slitwidth is 100 microns, instrument is rolled to the nominal North East (30475 Engineering Units), and Mirror / Occulter is set at 1.5 Solar Radii with 1.5 mm overocculting. UVCS Aperture Door is opened at this time. Internal Mirror / Occulter Heater set to 0% duty cycle. FOT told to continue to use UVCS ESR Limit Table. Expected Limit Violation sheets submitted to FOT via SOC for any expected limit violations during this time. FOT component of UVCS recovery, including enabling of the Experiment Offpoint and ESR Warning Flags, completed at approximately 18:56 UT. Note: Times are approximate. OBS_PROG: SCI_OBJ: OBJ: CMP_NAME: CMP_NUM: Duration: start: 2006.03.16.18:14 end: 2006.03.17.17:00 ONUMs = 22285 Instrument configuration: - Pointing: Sun center - Spacecraft Roll: 0 Degrees - Roll: 64.3 Degrees (30475) - Mirror/Occulter: 1.5 Ro 1.5 mm overocculting - LYA Slit: 100 um - OVI Slit: 100 um - LYA GRTPOS: 100000 - OVI GRTPOS: 164600 - LYA HIGH VOLTAGE RAMPED DOWN AND POWERED OFF - OVI HIGH VOLTAGE RAMPED DOWN AND POWERED OFF - VLD HIGH VOLTAGE RAMPED DOWN AND POWERED OFF - LYA DETECTOR POWERED OFF - VLD DETECTOR POWERED OFF - OVI mask: msk_000303_OVI in slot 3 Fits Files: GAP between 03/16/06|21:04:39( 6383) and 03/17/06|03:48:57(12450)