UVCS MISSION LOG ---------------- Date: 16 June 2003 ----- Last revision: 18 June 2003 (Wu) -------------- File Name: 2003.06.18.a.log ----------- Compiled by: R. Wu ------------ UVCS Activity: JOP 153 RHESSI Major Flare Watch Campaign for -------------- 18 June 2003 Flush and Abort JOP 153 RHESSI Major Flare Watch Campaign for 18 June 2003 Place UVCS in Hard Safe Configuration for SOHO Offpoint Manuever of 18 June 2003 UVCS in Hard Safe Configuration UVCS Recovery to Soft Safe Configuration UVCS in Soft Safe Configuration SOHO Activity: Received via email from SOC on 17 June 2003 -------------- @ 14:21:56 UT 18 JUNE 2003 OFFPOINT TIMELINE ----------------------------- Last Update: 17 June 13 UT Standard Disclaimer: All times are in UT and are estimates NOTES: SWAN will be observing in a safe direction during the maneuver EIT will do calibrations during maneuvers TUESDAY -- 17 June 2003 ---------------------- 11:35 - 17:20 UT D54 18:15 - 00:35 UT D27 Limit sheets for safing are due by 3pm WEDNESDAY -- 18 June 2003 ------------------------ 04:30 - 13:45 UT D66 13:30 - 21:30 UT D16 21:10 - 04:45 UT D46 NRT Available SOC here by 11:30 UT 12:00 UVCS safing (~45 minutes) 13:15 Handover to D16 14:00 SVM Reserved time 14:30 LASCO safing (~30 minutes) 15:15 CDS safing (~20 minutes) 16:00 FOT will begin Profile in NM/RMW script (steps 1-3) FOT will open MDI loop with permission FOT will disable offpoint flag function FOT will disable ESR flag to UVCS, LASCO FOT will go to SSR record FOT will do profile and test FOT may do [partial] SSR dump then go to VC2 FOT will enable offpoint flag function FOT will close MDI loop with permission FOT will enable ESR flag to UVCS, LASCO ~20:00 NRT available CDS recovery (~15 minutes) UVCS recovery (~1 hour) LASCO recovery (~45 minutes) CDS & LASCO loads THURSDAY -- 19 June 2003 ------------------------ UVCS will load in the morning once thermally stable EOF Staff: L. Strachan: Lead Scientist ---------- R. Wu: Commander M. Uzzo: Planner Command file: 03.06.18.12:00:00.cmd.log Activity: --------- 1) JOP 153 RHESSI Major Flarewatch Campaign Sequence: 03.03_HESSI.tcl SCI_SPEC: CME Watch at 1.7 Ro as part of JOP 153. Sit and Stare with relatively large spectral coverage, including the [Fe XVIII] 974 line for high temperatures. OBS_PROG: Primary: Temporal Coverage Sub Obj: Temporal Resolution Sub Obj: Spectral Coverage SCI_OBJ: Plasma Properties...Ionization State OBJ: CME CMP_NAME: JOP153, Major Flare Watch; UVCS; CDS; EIT; LASCO; MDI; TRACE(S/C); RHESSI(S/C); MaxMill CMP_NUM: 6961 Duration: start: 2003.06.18.08:13 end: 2003.06.18.12:02 ONUMs = 20001 (80 exps) 20002 (25 exps) ; aborted Instrument configuration: - Pointing: Sun center - Roll: 100 Degrees (36976) - Mirror/Occulter: 1.75 Ro 1.5 mm overocculting - LYA Slit: 50 um - OVI Slit: 100 um - LYA GRTPOS: 128000 - OVI GRTPOS: 236900 - LYA mask: LYA_93_1sec in slot 2 - OVI mask: OVI_HESSI_236900 in slot 1 Fits Files: q03.06.18.08:13:57.lya.dat q03.06.18.08:13:57.ovi.dat q03.06.18.08:13:57.vld.dat q03.06.18.11:07:38.lya.dat q03.06.18.11:07:38.ovi.dat q03.06.18.11:07:38.vld.dat 2) Place UVCS in Hard Safe Configuration Sequence: Manual SCI_SPEC: Following completion of Major Flarewatch for 18 June 2003, UVCS is placed into a Hard Safe configuration in preparation for the SOHO Offpoint Manuever of 18 June 2003. Detector High Voltage is then ramped down and turned off, OVI Slit is closed from 150 microns to 100 microns, instrument is rolled to the nominal East (35156 Engineering Units), and Mirror / Occulter 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, and Internal Spectrometer Heater set to 60% duty cycle. Expected Limit Violation sheets submitted to FOT via SOC for any expected limit violations during this time. FOT additionally told to use UVCS Hard Safe (or "Door Closed") Limit Table. Experiment Offpoint, and ESR Flags disabled for Manuever. OBS_PROG: SCI_OBJ: OBJ: CMP_NAME: CMP_NUM: Duration: start: 2003.06.18.12:02 end: 2003.06.18.12:38 ONUMs = 20002 Instrument configuration: - Pointing: Sun center - Roll: 90 Degrees (35156) - Mirror/Occulter: 1.5 Ro 1.5 mm overocculting - LYA Slit: 50 um - OVI Slit: 100 um - LYA GRTPOS: 128000 - OVI GRTPOS: 236900 - 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 mask: LYA_93_1sec in slot 2 - OVI mask: OVI_HESSI_236900 in slot 1 Fits Files: 3) UVCS in Hard Safe Configuration Sequence: None SCI_SPEC: Following completion of Major Flarewatch for 18 June 2003, UVCS is placed into a Hard Safe configuration in preparation for the SOHO Offpoint Manuever of 18 June 2003. Detector High Voltage is then 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 also closed 708 steps, Internal Mirror / Occulter Heater set to 100% duty cycle, and Internal Spectrometer Heater set to 60% duty cycle. Expected Limit Violation sheets submitted to FOT via SOC for any expected limit violations during this time. FOT using UVCS Hard Safe (or "Door Closed") Limit Table. Experiment Offpoint, and ESR Flags disabled for Manuever. NOTES: ESR Flag Disabled ~ 15:21 UT RFI expected at ~ 17:00 UT, safing activities moved as early as allowable (UVCS activities already complete). Script to reenable Experiment Offpointbegun ~ 17:09 UT. OBS_PROG: SCI_OBJ: OBJ: CMP_NAME: CMP_NUM: Duration: start: 2003.06.18.12:38 end: 2003.06.19.00:13 ONUMs = 20002 Instrument configuration: - Pointing: ??????? - Roll: 90 Degrees (35156) - Mirror/Occulter: 1.5 Ro 1.5 mm overocculting - LYA Slit: 50 um - OVI Slit: 100 um - LYA GRTPOS: 128000 - OVI GRTPOS: 236900 - 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 mask: LYA_93_1sec in slot 2 - OVI mask: OVI_HESSI_236900 in slot 1 Fits Files: 4) UVCS Recovery from Hard Safe to Soft Safe Configuration Sequence: Manual SCI_SPEC: Following completion of SOHO Offpoint Manuever for 18 June 2003, 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 and Internal Spectrometer Heater set to 0% duty cycle. Expected Limit Violation sheets submitted to FOT via SOC for any expected limit violations during this time. FOT told to use UVCS Hard Safe (or "Door Closed") until full recovery tomorrow. Experiment Offpoint and ESR Flags enabled prior to recovery. OBS_PROG: SCI_OBJ: OBJ: CMP_NAME: CMP_NUM: Duration: start: 2003.06.19.00:13 end: 2003.06.19.00:29 ONUMs = 20002 Instrument configuration: - Pointing: Sun Center - Roll: 90 Degrees (35156) - Mirror/Occulter: 1.5 Ro 1.5 mm overocculting - LYA Slit: 50 um - OVI Slit: 100 um - LYA GRTPOS: 128000 - OVI GRTPOS: 236900 - 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 mask: LYA_93_1sec in slot 2 - OVI mask: OVI_HESSI_236900 in slot 1 Fits Files: 5) UVCS in Soft Safe Configuration Sequence: None SCI_SPEC: Following completion of SOHO Offpoint Manuever for 18 June 2003, 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 open. Internal Mirror / Occulter Heater and Internal Spectrometer Heater set to 0% duty cycle. Expected Limit Violation sheets submitted to FOT via SOC for any expected limit violations during this time. FOT told to use UVCS Hard Safe (or "Door Closed") until full recovery tomorrow. Experiment Offpoint and ESR Flags enabled prior to recovery. Results and repercusions from Offpoint Manuever detailed in email received from SOC on Thu, 19 Jun 2003 at 14:31:47 UT. After a spacecraft offpoint maneuver late this morning confirmed that the high gain antenna (HGA) had in fact not moved more than a small amount (in comparison to the steps commanded) since the first offpoint on June 4, we decided to switch to the redundant HGA electronics. The FOT did so at approximately 19:30 UT, and we commanded an HGA motion about the spacecraft Z axis (i.e., east-west antenna motion) of roughly one degree. Less than one-fifth of that motion took place, as determined from automatic gain control readings at the ground station. We commanded another 131 steps, without any noticable antenna movement. The similarity of the behavior on both the A and B sides indicates the likelihood of a mechanical problem with the antenna drive motor or mechanisms. We held a teleconference with the manufacturer of the motor (Moog) and, following their recommendation, tried to command the antenna in high speed (100 Hz instead of 0.1 Hz) in both directions, without success. During the night we will increase the temperature of the motor. Tomorrow we will repeat the same back and forth movement hoping to unstick the HGA. If we are unable to drive the antenna any further back toward the center of its E-W range, we will probably lose high-rate (i.e., scientific) telemetry this weekend or early next week. The spacecraft will continue to maintain contact in low rate via the low-gain antenna. The HGA east-west angle is near the "sweet spot" that would allow maximum coverage of the +/- 25-degree range of the spacecraft orbit's major axis, with some data loss (perhaps one month out of three) if we roll the spacecraft by 180 degrees once every ~ three months. (The 3 db half-width of the antenna beam is about 7 degrees.) With the help of the NASA Flight Dynamics Facility, we are also exploring the feasibility of changing the orbit in order to optimize the coverage period of the HGA. Your team should be prepared to safe your instrument for an off-time of 4-6 weeks. OBS_PROG: SCI_OBJ: OBJ: CMP_NAME: CMP_NUM: Duration: start: 2003.06.19.00:29 end: 2003.06.19.12:43 ONUMs = 20002 Instrument configuration: - Pointing: Sun Center - Roll: 90 Degrees (35156) - Mirror/Occulter: 1.5 Ro 1.5 mm overocculting - LYA Slit: 50 um - OVI Slit: 100 um - LYA GRTPOS: 128000 - OVI GRTPOS: 236900 - 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 mask: LYA_93_1sec in slot 2 - OVI mask: OVI_HESSI_236900 in slot 1 Fits Files: