UVCS MISSION LOG ---------------- Date: 31 March 2008 ----- Last revision: 05 April 2008 (Wu) -------------- File Name: 2008.03.31.a.log ---------- Compiled by: M. Uzzo, R. Wu ------------ UVCS Activity: Ramp Down and Turn off OVI Detector HV -------------- Power off OVI Detector Turn on LYA Detector Conduct LYA Stimulus Pulse Test Turn on and Ramp Up LYA Detector HV Load and Start LYA Detector Diagnostic for 31 March 2008 Load and Start JOP 202: Origin of the Slow Wind and Streamer Base for 31 March - 01 April 2008 SOHO Activity: Received via email Tuesday, 01 April 2008, -------------- 03:59:38 GMT: OBT DISTRIBUTED TO UVCS BY FOT EOF Staff: L. Strachan: Lead Scientist ---------- M. Uzzo: Commander, Planner R. Wu Command file: 08.03.31.15:30:44.cmd.log Activity: --------- 1) LYA Stimulus Pulse Test Sequence: TakeUV_TxN.tcl SCI_SPEC: OBS_PROG: SCI_OBJ: OBJ: CMP_NAME: CMP_NUM: Duration: start: 2008.03.31.15:59 end: 2008.03.31.16:03 ONUMs = 24213 (2 exps) Instrument configuration: - Pointing: Sun center - Spacecraft Roll: 0 Degrees - Roll: 55 Degrees (28784) - Mirror/Occulter: 1.7 Ro 1.5 mm overocculting - LYA Slit: 100 um - OVI Slit: 100 um - LYA GRTPOS: 100000 - OVI GRTPOS: 210000 - LYA MCP Voltage: 0 - OVI MCP Voltage: 0 - LYA mask: LYA_303_8x2 in slot 3 Fits Files: q08.03.31.15:57:52.lya.dat 2) LYA Detector Diagnostic Sequence: LYA_100_chk.tcl SCI_SPEC: OBS_PROG: Spatial Resolution SCI_OBJ: OBJ: Coronal Hole CMP_NAME: CMP_NUM: Duration: start: 2008.03.31.16:30 end: 2008.03.31.17:00 ONUMs = 24214 (6 exps) Instrument configuration: - Pointing: Sun center - Spacecraft Roll: 0 Degrees - Roll: 180 Degrees (51551) - Mirror/Occulter: 1.75 Ro 1.5 mm overocculting - LYA Slit: 100 um - OVI Slit: 100 um - LYA GRTPOS: 100000 - OVI GRTPOS: 210000 - LYA MCP Voltage: 195 - LYA mask: LYA_chk_1xfull in slot 6 Fits Files: q08.03.31.16:17:33.lya.dat 3) Streamer Study LyA Observations Sequence: 08.03_StrJOP202_LYA.tcl, n = 26, m = 2 SCI_SPEC: Our primary goal is to understand the nature and origin of the slow solar wind and its relation to coronal streamers. We will characterize solar wind source regions from streamers, including their boundaries and helmet tops. Velocity measurements will be made using Doppler dimming and correlation tracking of plasma blobs in white light. Abundance measurements will be made both in the corona and in the solar wind to track the origin of solar wind streams. In situ and IPS measurements of wind speeds will be used to map the slow wind streams from the Sun to the heliosphere. We require multiple instruments in order to track the slow wind from its origin in Sun's lower atmosphere, through the corona, and out to interplanetary space. The slow solar wind, while often associated with the streamer belt at solar minimum, most likely originates from more than one type of coronal structure. The various instruments required have capabilities that are suited for probing the Sun in different observational regimes. Instruments with the highest time cadence are best suited for studies of intermittent sources. Spectroscopic instruments are best suited for time averaged observations of steady source regions. The strength of the spectroscopic observations is that they can tag the wind by characterizing the kinetic temperatures, outflow speeds, and abundance composition of the solar wind source regions in the corona. Imaging instruments can provide the best constraints for the magnetic field geometry and also determine electron densities and temperatures. The IPS instruments will provide information on the velocity, density, magnetic field, and spatial distribution of fast and slow wind in the heliosphere. Solar wind instruments on Ulysses and other in situ spacecraft will provide the composition data to make the connections back to the Sun. OBS_PROG: Primary: Sensitivity Sub Obj: Spectral Resolution SCI_OBJ: Primary: Coronal Dynamics...Outflow Velocities Sub Obj: Abundances OBJ: Streamer CMP_NAME: JOP 202, Origin of the slow solar wind CMP_NUM: 7266 Duration: start: 2008.03.31.17:07 end: 2008.04.01.15:09 ONUMs = 24215 (288 exps) 24216 (287 exps) 24217 (63 exps) Instrument configuration: - Pointing: Sun center - Spacecraft Roll: 0 Degrees - Roll: 235 Degrees (61563) - Mirror/Occulter: 1.7 Ro 1.5 mm overocculting - LYA Slit: 50 um - OVI Slit: 100 um - LYA GRTPOS: 100000 - OVI GRTPOS: 210000 - OVI MCP Voltage: 200 - OVI mask: LYA_str_8x1 in slot 1 Fits Files: q08.03.31.17:07:04.lya.dat q08.04.01.03:02:16.lya.dat q08.04.01.12:57:28.lya.dat GAP between 04/01/08|13:23:51( 7000) and 04/01/08|13:26:27( 7256)