UVCS MISSION LOG 
				----------------

	Date:		13 September 2004
	-----

 	Last revision:	21 October 2004 (Wu)
	--------------

	File Name:	2004.09.16.a.log
	----------

	Compiled by:	M. Uzzo, R. Wu
	------------

	UVCS Activity:  Place UVCS into a Modified Hard Safe Configuration
	--------------	UVCS in Modified Hard Safe configuration for Keyhole

	SOHO Activity:	Use UVCS Nominal Keyhole Safing Procedure U-04 per 
        --------------  OCD 1931
        		SOHO Transponder Swap

	EOF Staff:	M. Uzzo: Lead Scientist
	----------	M. Uzzo: Commander, Planner
			Y.-K. Ko
			R. Wu

	Command file:	04.09.16.13:02:25.cmd.log

	Activity:
	---------

	1) Place UVCS in Modified Hard Safe Configuration

	Sequence: Manual

	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 
		  detectors are powered off.

		  FOT use ESR Limit Table, and turn on TSU Substitution 
		  Heater (Circuit #84) and set duty cycle to default 60%. 
		  Experiment Offpoint, and ESR Flags disabled for Keyhole.

		  ESR Flag disabled at 15:21 UT 16 September 2004.
		  Offpoint Flag disabled at 15:25 UT 16 September 2004.
		  TSU Substitution Heater (Circuit #84) turned on at
		  approximately 15:30 UT 16 September 2004.

	OBS_PROG: 

	SCI_OBJ:  

	OBJ:      

	CMP_NAME: 

	CMP_NUM:  

	Duration: start: 2004.09.16.15:32
                    end: 2004.09.16.15:48ish

	ONUMs =	46277

	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: 229000

		- 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_230 in slot 1

	Fits Files:


	2) 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, and turn on TSU Substitution 
		  Heater (Circuit #84) and set duty cycle to default 60%. 
		  Experiment Offpoint, and ESR Flags disabled for Keyhole.

		  Transponder swap completed at approximately 16:35 UT, 
		  17 September 2004, now using Low Gain Antenna.

	OBS_PROG: 

	SCI_OBJ:  

	OBJ:      

	CMP_NAME: 

	CMP_NUM:  

	Duration: start: 2004.09.16.15:48ish
                    end: 2004.09.17.17:00

	ONUMs =	46277

	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: 229000

		- 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_230 in slot 1

	Fits Files: