UVCS MISSION LOG ---------------- Date: 22 December 2004 ----- Last revision: 29 December 2004 (Wu) -------------- File Name: 2004.12.27.a.log ---------- Compiled by: M. Uzzo, R. Wu ------------ UVCS Activity: UVCS Recovery from a Modified Hard Safe Configuration ------------- to a Soft Safe Configuration Load OVI Detector Mask OVI_str_188_225 into OVI slot 4 Load OVI Detector Mask OVI_MPM_232 into OVI slot 5 UVCS Stimulus Pulse Test UVCS in Soft Safe Configuration SOHO Activity: -------------- EOF Staff: M. Uzzo: Lead Scientist ---------- M. Uzzo: Commander, Planner R. Wu Command file: 04.12.27.19:51:41.cmd.log Activity: --------- 1) UVCS in Modified Hard Safe Configuration Sequence: SCI_SPEC: Following completion of Science Observations, UVCS is placed into a modified Hard Safe configuration in preparation for the SOHO Keyhole Period. Detector High Voltage is ramped down and then turned off, OVI Slit is set to 100 microns, instrument is rolled to the nominal East (35156 Engineering Units), and 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. Internal Spectrometer Heater is not turned on. In addition to "traditional" Hard Safe configuration, all UVCS Detector Power are turned off. FOT use ESR Limit Table, TSU Substitution Heater (Circuit #84) powered on. Experiment Offpoint, and ESR Flags disabled for Keyhole. OBS_PROG: SCI_OBJ: OBJ: CMP_NAME: CMP_NUM: Duration: start: 2004.12:27.17.00 end: 2004.12:27.21:29 ONUMs = 46977 Instrument configuration: - Pointing: Sun center - Spacecraft Roll: 180 Degrees - Roll: 270 Degrees (35156) - Mirror/Occulter: 1.5 Ro 1.5 mm overocculting - LYA Slit: 50 um - OVI Slit: 100 um - LYA GRTPOS: 128000 - OVI GRTPOS: 177596 - LYA HIGH VOLTAGE RAMPED DOWN DOWN AND POWERED OFF - OVI HIGH VOLTAGE RAMPED DOWN DOWN AND POWERED OFF - VLD HIGH VOLTAGE RAMPED DOWN DOWN AND POWERED OFF - LYA DETECTOR POWERED OFF - OVI DETECTOR POWERED OFF - VLD DETECTOR POWERED OFF - OVI mask: OVI_Syn_178 in slot 2 Fits Files: 2) UVCS Recovery 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. OVI Detector powered on. Detector High Voltage remains ramped down and turned off OVI Slitwidth is 100 microns, instrument is rolled to the nominal WEST (35156 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 Heater set to 0% duty cycle. XDL Detector Thresholds set. 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. ESR Flag enabled at approximately 21:29 UT, 27 December 2004. Experiment Offpoint Flag enabled at approximately 21:34, 27 December 2004. OBS_PROG: SCI_OBJ: OBJ: CMP_NAME: CMP_NUM: Duration: start: 2004.12.27.21:29 end: 2004.12.27.22:15 ONUMs = 46977 Instrument configuration: - Pointing: Sun center - Spacecraft Roll: 180 Degrees - Roll: 270 Degrees (35156) - Mirror/Occulter: 1.5 Ro 1.5 mm overocculting - LYA Slit: 50 um - OVI Slit: 100 um - LYA GRTPOS: 128000 - OVI GRTPOS: 177596 - OVI HIGH VOLTAGE RAMPED DOWN DOWN AND POWERED OFF - OVI mask: OVI_Syn_178 in slot 2 Fits Files: 3) UVCS Stimulus Pulse Test Sequence: Manual SCI_SPEC: OBS_PROG: SCI_OBJ: OBJ: CMP_NAME: CMP_NUM: Duration: start: 2004.12.27.22:15 end: 2004.12.27.22:29 ONUMs = 21909 (2 exps) Instrument configuration: - Pointing: Sun Center - Spacecraft Roll: 180 Degrees - Roll: 270 Degrees (35156) - Mirror/Occulter: 1.5 Ro 1.5 mm overocculting - LYA Slit: 50 um - OVI Slit: 100 um - LYA GRTPOS: 128000 - OVI GRTPOS: 177596 - OVI HIGH VOLTAGE RAMPED DOWN DOWN AND POWERED OFF - OVI mask: msk_000303_OVI in slot 3 Fits Files: q04.12.27.22:13:47.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 EAST (35156 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 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. Experiment Offpoint and ESR Flags enabled. OBS_PROG: SCI_OBJ: OBJ: CMP_NAME: CMP_NUM: Duration: start: 2004.12.27.22:00 end: 2004.12.28.13:00 ONUMs = 21909 Instrument configuration: - Pointing: Sun center - Spacecraft Roll: 180 Degrees - Roll: 270 Degrees (35156) - Mirror/Occulter: 1.5 Ro 1.5 mm overocculting - LYA Slit: 50 um - OVI Slit: 100 um - LYA GRTPOS: 128000 - OVI GRTPOS: 177596 - OVI HIGH VOLTAGE RAMPED DOWN DOWN AND POWERED OFF - OVI mask: msk_000303_OVI in slot 3 Fits Files: