Description

Page : 775

Sondrestrom Lidar Operation Log

Operator(s) : E.Guðmundsson, J.Jørgensen
Purpose : Routine data collection-stratallert
Date(s) : 010222 - 010223
File(s) : L102222 - L102231
Comments : At 01:43 UT A sporadic Na appeared at 110km.

NOTE! temperature instabilty in the Harris room caused by warm glacier wind.
Regulation scheme out of regulation range.
Temperature reached 32 degC. This rise in temperature was reflected in the
temperature in the laser room itself where the temperature reached 26.5 deg C.
The wavelength stability of the dye laser as read from the wavemeter was stable
but
a wavelength sweep at the end of the run was done to ensure that the sodium
miximum indication from the wavemeter had not chanqged. The result was rather
disapointing as the maximum sodium had moved by -2pm. So even though the
wavemeter indicated stable wavelength output the waveleght had drifted by -2pm.
Logfile : l0102220.log

Setup:0

Page : 776
[Variables]
Dye Power=74mJ
Rayleigh Power=510mJ

[0]
Iris=min_opening
Rayleigh System=On
Dye System=On
Daystar=Out
Polarizer=In
HalfWave Plates=Tracking
Rayleigh Filter=2:532(.5nm)

Logsheet:0

Page : 777

Sondrestrom Lidar Operation Log

Log Sheet 1 of 2
Operators : E.Guðmundsson
Date(s) : 010222 - 010223
File(s) : L102222 - L102230

Files	Time [UT]	Comments	Cnt	S	Ope
L102222	21:45:56	Start of experiment	10028	0	EG
L102222	21:51:46	There is a nipple protruding from the sodium layer at 100km	9966	0	EG
L102222	22:23:07	tuning for maximum sodium	9885	0	EG
L102222	22:44:01	Maximum sodium at 589.158nm as indcated on wavemeter	9530	0	EG
L102222	22:44:22	UPS ! A small temperature problem in the Harris room.	9447	0	EG
		The fixed (non regulated heat sources) 3kw were putting
		to much heat out so that the regulated cold air delivery from the
		outside was not enough to keep the room at setpoint.
		The temperature had reached 32deg C when I noticed and
		unplugged the heat sources the temperature is falling, but
		is going to take some time before things stablilize at setpoint
		or 23-24deg C. Not enough ! Outside air to warm to regulate by.
L102222	23:29:26	Sodium HG adjusted	9114	0	EG
L102222	23:50:46	Tweeked the sodium convergence to if I could get any	9045	0	EG
		improvement.
L102222	23:58:43	It did improve things!	9033	0	EG
L102222	00:07:22	changed sodium channel chopper delay from 3925us to 3885	9291	0	EG
		thus psuhing the chopping altitude up by 6km
L102222	01:07:40	incremented	9560	0	EG
L102230	01:43:38	There is something at 110km on the sodium, like a	9126	0	EG
		seperate sodium layer starting at 105km and ending at 115km	9117
L102230	01:53:14	I think I can safely say that this is a sporadic Na event	9273	0	EG
L102230	01:59:58	The layer is desending and getting stronger	9154	0	EG
L102230	02:41:05	There is soem strange background comming in the rayleigh data	9628	0	EG

Logsheet:1

Page : 778

Sondrestrom Lidar Operation Log

Log Sheet 2 of 2
Operators : E.Guðmundsson, J.Jørgensen
Date(s) : 010223 - 010223
File(s) : L102230 - L102231

Files	Time [UT]	Comments	Cnt	S	Ope
L102230	02:56:45	Noise gone in the Rayleigh. This was my fault a new fan caued	9337	0	EG
		the noise (electrical in nature)
L102230	02:59:28	The sodium counts have fallen quite a bit. This may be due	9075	0	EG
		to the temperature instability that we have observed tonight
L102230	03:06:52	doing a sodium max seek.	9253	0	EG
L102230	03:27:08	found maximum sodium at 589.156nm as indicated by the		0	EG
		wavemeter.
L102230	03:33:02	Sodium Convergence mirror adjusted	9251	0	EG
L102230	03:34:37	Apparantly not to much drift of the convergence in spite of	9232	0	EG
		the unfortunate temperature drift.	9232
L102230	03:42:57	It looks as if the drop in sodium counts is real and not a	9416	0	EG
		system artifact caused by teh temperature drift.
L102230	04:47:15	Sporadic sodium	9768	0	JJ
L102231	05:36:31	Filenumber incremented	10268	0	JJ
L102231	06:12:30	Computer crashed when trying to turn off. Don't have the		0
		real stop time....
L102231	06:13:24	End of experiment		0