Description


Page : 489

Sondrestrom Lidar Operation Log


Operator(s) : E.Gudmundsson, J.Jørgensen, K.Richmond, M.McCready
Purpose : Routine data collection and tweeking the Daystar
Date(s) : 000315 - 000317
File(s) : L3150 - L3162
Comments :
Logfile : l0003150.log

Setup:0


Page : 490
[Variables]
Dye Power=85mJ
Rayleigh Power=570mJ

[0]
Iris=1.5mm
Rayleigh System=On
Dye System=On
Daystar=In
Polerizer=In
HalfWave Plates=Tracking
Rayleigh Filter=2:532(.5nm)

[1]
Iris=1.5mm
Rayleigh System=On
Dye System=On
Daystar=Out
Polerizer=In
HalfWave Plates=Tracking
Rayleigh Filter=2:532(.5nm)

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


[3]
Iris=min_opening

Setup:1


Page : 491
Rayleigh System=On
Dye System=On
Daystar=In
Polerizer=In
HalfWave Plates=Tracking
Rayleigh Filter=2:532(.5nm)

[4]
Iris=min_opening
Rayleigh System=On
Dye System=On
Daystar=Out
Polerizer=In
HalfWave Plates=Tracking
Rayleigh Filter=2:532(.5nm)

Logsheet:0


Page : 492

Sondrestrom Lidar Operation Log


Log Sheet 1 of 6
Operators : E.Gudmundsson
Date(s) : 000315 - 000315
File(s) : L3150 - L3152
FilesTime [UT]CommentsCntSOpe
L315001:17:59Start of experiment9700
Running with the daystar and the receiver open9560
L315001:31:04Sodium laser still warming upm, dye laser room wery cold0EG
laser out of tune, tuning now
L315001:35:11Rotating the daystar ccw11710EG
L315001:41:24stopped to check energy on the sodium, there will be a 0EG
small time gab beetween records
L315001:45:13Removing daystar to change the way it sits in its mount0EG
L315001:47:50Incremented8150EG
L315101:48:12Running with setup 199001EG
L315101:57:44Chopping of the sodium was not in effect, chopping now1EG
L315102:17:49Counts, plugged the daystar in 20 min ago installing now100141EG
L315102:18:20Pausing data collection1EG
L315102:22:22Incremented, resuming data collection with daystar in the path100720EG
L315202:24:42Daystar transmission just below 10% !!9420EG
L315202:25:26Rotating ccw9420EG
L315202:41:17Tweeked Sodium HG0EG
L315202:47:49Counts13570EG
L315202:51:44Looks like I've maxed at 14% transmission (assuming 14690EG
10000 counts without the daystar
L315202:53:00Changing to tilt adjustment0EG
L315203:02:57Sodium Convergence mirror adjusted14620EG
L315203:07:57Passed the max now on the daystar til adjustment going back12530EG
L315203:21:47Sodium Convergence mirror adjusted15060EG

Logsheet:1


Page : 493

Sondrestrom Lidar Operation Log


Log Sheet 2 of 6
Operators : E.Gudmundsson
Date(s) : 000315 - 000315
File(s) : L3152 - L3155
FilesTime [UT]CommentsCntSOpe
L315203:22:0315% is all I get, Sodium Convergence mirror adjusted14970EG
L315203:22:57Then again, I lack one degree of freedom for the tilt0EG
Have to look at a tilt adjustment perpendicular to the one
the mount has.
L315203:24:17Sliding the daystar out of the path to check counts without.15320EG
L315203:26:47Running with setup 11EG
L315203:27:28counts96001EG
L315203:28:04Pausing data collection to lock everything in place1EG
L315303:38:01Receiver has been closed , incremented running with92341EG
setup 1
L315304:26:32Sodium Convergence mirror adjusted80551EG
L315306:38:22Sodium Convergence out of tune, reconcerged1EG
L315306:54:09Sodium Convergence mirror adjusted86891EG
L315307:35:12Sodium Convergence mirror adjusted90521EG
L315307:35:20Incremented for no particular reason 90521EG
L315408:21:58Sodium Convergence mirror adjusted93511EG
L315408:25:43Paused to close iris fully91861EG
L315408:27:35Incremented90831EG
L315508:29:22Little or no impact on sodium, rayleigh counts downt to 381138112EG
L315508:29:54trying to reconverge rayleigh2EG
L315508:34:00Sodium Convergence mirror adjusted73102EG
L315508:34:08some improvement on the rayleigh, trying again73102EG
L315508:35:43Not worth it 2EG
L315509:26:19I have a feeling that the background is rising to fast!64802EG

Logsheet:2


Page : 494

Sondrestrom Lidar Operation Log


Log Sheet 3 of 6
Operators : E.Gudmundsson, J.Jørgensen, K.Richmond
Date(s) : 000315 - 000315
File(s) : L3155 - L3156
FilesTime [UT]CommentsCntSOpe
L315509:26:42SZA =92.3 S/N (6657-133) /133=49 @30km2EG
L315509:30:49Made a foolish attempt at converging the sodium2EG
lets see how it turns out
L315509:46:12Reconverged rayleigh2EG
L315509:46:34SZA=90.5 S/N=(6699-485)/485=12.8 @30km2EG
L315510:01:23SZA=89.0 S/N=(6158-995)/995=5.192EG
L315510:12:21Paused for setup change2EG
87.9/6242
L315510:16:38running with setup 3, Incremented3EG
L315610:19:59SZA 87.3 S/N=(903-52)/52=16.39403EG
L315610:22:07Rayleigh Convergence mirror adjusted9223EG
L315610:42:45atempting to tweek HWP to reduce background11633EG
will not increment until done
L315610:58:49done tweeking, no need to increment no change in signal3EG
to speek of
L315615:36:56Sodium stil showing up on integrated noise subtracted profile3JJ
L315622:24:17Removed Daystar58863KR
L315622:27:07Going to remove polarizer, too.3KR
L315622:38:24Never mind, running with setup 455254KR
L315622:49:01Sodium Convergence mirror adjusted57604KR
L315623:17:47Sodium HG and converegece tweeked, energy down to 58mJ4EG
L315623:37:50Tuned the sodium -5pm, the tuning had drifted 4EG
from last night (the temperature in the room has to).
Observation. The strongest winter rayleigh equivalent return

Logsheet:3


Page : 495

Sondrestrom Lidar Operation Log


Log Sheet 4 of 6
Operators : E.Gudmundsson, K.Richmond
Date(s) : 000315 - 000316
File(s) : L3156 - L3160
FilesTime [UT]CommentsCntSOpe
L315623:40:04of the sodium layer has been observed to be around 27-28km58654EG
Now it seems it's depleting day by day. The current rayleigh5865
equivivalent return is around 31-32km.
Observation: Don't know if its the system drift or something
else, but it appears as we see a differnce from day to night.
less layer by day than it starts picking up just after sunset.
This may be due to gravity waves bringing the layer in and
out of the altitude summing window in Johns display.
Have to ask him to widen it to acomdate for layer altitude
variations.
L315601:03:07Thin layer way at top of Na layer65304KR
L315603:54:28Pausing to open up the iris a bit60744EG
L315603:56:46Incremented, now running with setup 11EG
L315603:57:31UPS! forgot to crank up the HV again first record probably1EG
with little signal
L316004:39:57Rayleigh Convergence mirror adjusted79661EG
L316004:41:36Reconverged sodium81271EG
L316004:51:04Sodium Convergence mirror adjusted86201EG
L316005:00:53The sodium convergence has changed, I opened the 88451EG
door to van one?? could there be a correlation?
Reconverged
L316007:38:16The sodium layer has over the past 20-30min enhanced90001EG
started to fade again.
L316007:51:34Dawn is breaking, closing iris down now to have some time93001EG

Logsheet:4


Page : 496

Sondrestrom Lidar Operation Log


Log Sheet 5 of 6
Operators : E.Gudmundsson
Date(s) : 000316 - 000316
File(s) : L3160 - L3162
FilesTime [UT]CommentsCntSOpe
L316007:52:05to optimize convergence1EG
L316007:52:18paused for iris closing1EG
L316007:53:38Running with setup 2, incremented2EG
L316107:55:55Sodium slightly affected Rayleigh signal cut by ~50%40362EG
L316107:56:30Converging Rayleigh32652EG
L316107:57:39Improvement counts ~6000@30km trying again37802EG
L316107:58:47SZA=100.437802EG
L316108:02:06I don't think I can do it any better, 81372EG
L316108:02:54Converging sodium2EG
L316108:04:32Done converging sodium83452EG
L316108:06:21The sodium counts are now comparable to that before 83112EG
iris closdown.
L316108:27:18Rayleigh convergence drifted off, trying to converge again57242EG
L316108:36:41Done for the moment, waiting to see if it drifts2EG
L316108:41:43SZA=96.3 background=1 signal 7313.73132EG
L316109:00:55Sodium starting to fluctuate. Probably because I opened68022EG
the door to van 1, Closing the door to see if things
become stable. later...it turned out to stabilize after closing!!
L316109:49:41SZA=89.7 S/N=~1075292EG
L316110:15:52Pausing to change setup80812EG
L316110:18:37Running with setup 3, incremented81733EG
L316210:36:08Pausing to check receiver12173EG
L316210:38:24resumed11893EG
10:38:313EG

Logsheet:5


Page : 497

Sondrestrom Lidar Operation Log


Log Sheet 6 of 6
Operators : E.Gudmundsson, M.McCready, K.Richmond
Date(s) : 000316 - 000317
File(s) : L3162 - L3162
FilesTime [UT]CommentsCntSOpe
L316221:01:50sodium layer moving down in altitude7023MM
L316221:08:44removed daystar57772KR
L316222:05:15Investigating dye instability52882KR
L316222:08:30Dye power 56 mJ and holding52792KR
L316222:13:00Oops, had forgotten to reopen dye pumping beam 53992KR
L316222:18:13Sodium Convergence mirror adjusted51792KR
L316222:33:31Dye system tuned, Sodium Convergence mirror adjusted59372KR
L316222:49:47Sodium Convergence mirror adjusted66592KR
L316223:18:10Sodium Convergence mirror adjusted67922KR
L316223:44:26Sodium Convergence mirror adjusted70192KR
L316200:19:46Not sure why Na system so unstable... Turbulence in76342KR
chimney? Dye getting old?
L316200:52:01Opened iris to 1.5mm in attempt to stabilize Na return. 85181KR
Sodium Convergence mirror adjusted
L316203:22:17Thin haze layer63511KR
L316204:32:44Thick Haze layer 14101EG
L316206:15:22Clouds have crept in and returns have reached almost zero.391EG
Pausing experiment in the hope that the clouds go away
L3162The clouds are ust getting heavier, closing down at 9:39UT
L316206:15:23End of experiment1EG