Description

Page : 785

Sondrestrom Lidar Operation Log

Operator(s) : E.Guðmundsson, T.Jørgensen, J.Jørgensen
Purpose : Routine data collection
Date(s) : 010309 - 010310
File(s) : L103090 - L103104
Comments : Run summary:
Nice skies at startunp and good data comming in. Due to work done on the
temperature regulation earlier during today, there were some temperature
problems at the beginningn of the run. We started the run with a bit to high a
tempereture. The temperature converged at the setpoint in a matter of an hour
or
two.

A double file increment at 01:15, file L0103100 does not exsits!

Nice data troughout the run.

On the morning side of the run, towards the end, operator started seeing someting
that resembled the sloping background problem we had some time ago. It turned
out
not to be a problem. The explanation to this was a very high noise signal due to
hgih SZA causing the signal to become corrupted.
Logfile : l0103090.log

Setup:0

Page : 786
[Variables]
Dye Power=65mJ
Rayleigh Power=520mJ

[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 : 787

Sondrestrom Lidar Operation Log

Log Sheet 1 of 2
Operators : E.Guðmundsson, T.Jørgensen, J.Jørgensen
Date(s) : 010309 - 010310
File(s) : L103090 - L103104

Files	Time [UT]	Comments	Cnt	S	Ope
L103090	21:45:30	Start of experiment		0	EG
L103101	01:15:30	Increment file #		0	TJ
L103101	02:30:13	Thin clouds moving through beam	8474	0	JJ
L103102	06:37:45	filenumber incremented.	10002	0	JJ
L103102	10:01:34	Clouds sin the way, Incremented	7483	0	EG
L103103	12:03:35	SZA=80.0 Rayleigh counts are 12408 noise is 5524	12694	0	EG
		=> S/N =~2, Sodium layer still quite visiible as a raw profile
L103103	13:21:02	Overcast		0	EG
L103103	13:42:11	Incremented, shut the Rayleigh laser down, I think we may	19176	0	EG
		have a problem on our hands!! Sloping noise background.	19176
		I does not seem to be laser induced. Perhaps this has to do	19176
		the super heavy background counts I'm seeing .	19176
L103104	14:05:28	Turning of the chopper and leaving it in open mode while		0	EG
		using the line a clock. This should reveal if the chopper
		is involved in this!
L103104	14:15:22	The chopper is no longer running and the blade is in the	11656	0	EG
		open position. waiting for some records
L103104	14:22:16	Blocing the sodium laser from exiting the roof. The laser	17929	0	EG
		is still running though
L103104	14:28:23	UPS! lost the triggers for a while, continuing		0	EG
L103104	14:40:54	Attenuating the signal		0	EG
L103104	14:48:13	Done attenuating by 20dB	451	0	EG
L103104	14:55:43	OK, It looks like I was crying woolf, By attenuation the		0	EG
		there is no apparent modulation in the background.

Logsheet:1

Page : 788

Sondrestrom Lidar Operation Log

Log Sheet 2 of 2
Operators : E.Guðmundsson
Date(s) : 010310 - 010310
File(s) : L103104 - L103104

Files	Time [UT]	Comments	Cnt	S	Ope
L103104	14:56:46	This is true for both Channels	490	0	EG
L103104	15:08:42	Rayleigh laser running now, dumped into the energy meter	460	0	EG
		and no sign of background modulation. This is somthing we
		need to look into, when does a high background start doing
		this?
L103104	15:14:58	There is no point in continuing the run, it's fully overcast now	433	0	EG
L103104	15:26:48	End of experiment	388	0	EG