Description


Page : 112

Sondrestrom Lidar Operation Log


Operator(s) : E.Gudmundsson, J.Geddes
Purpose : Routine data collection
Date(s) : 980724 - 980725
File(s) : L9807243 - L9807244
Comments : A sharp spike in the Rayleigh data was seen at roughly 50 km at 1 UT. A plane
had recently flown overhead, leaving a trail. Some cirrus clouds were also visible.
When high voltage on the Na PMT was reduced, the cloud profile observed on the
sodium system matched the profile of the spike.
Logfile : L9807241.log

Setup:0


Page : 113
[Variables]
Dye Power=81mJ
Rayleigh Power=560mJ

[0]
90% PMT Iris=not_installed
Rayleigh System=On
Dye System=On
Daystar=In
Polerizer=In
HalfWave Plates=Tracking

Logsheet:0


Page : 114

Sondrestrom Lidar Operation Log


Log Sheet 1 of 2
Operators : J.Geddes, E.Gudmundsson
Date(s) : 980724 - 980725
File(s) : L9807243 - L9807244
FilesTime [UT]CommentsCntSOpe
L980724322:26:10Start of experiment0JG
L980724322:28:20Daystar filter installed00JG
L980724322:31:45Clouds overhead00JG
L980724322:38:54Rayleigh HG adjusted10000JG
L980724322:40:13Dye convergence mirror adjusted10000EG
L980724323:11:12Sodium layer observed4730JG
L980724323:59:35Sodium layer observed5490JG
L980724300:00:30Rayleigh HG adjusted4910JG
L980724300:28:48Sodium layer observed4350JG
L980724300:48:21Wispy cirrus overhead3840JG
L980724300:59:46Sharp spike in Rayleigh data at about 50 km2670JG
L980724301:01:50Rayleigh beam brought out of convergence for several records2230JG
L980724401:06:46Convergence reattained, amplifier power was reduced from 2690JG
60 to 20.
L980724401:10:06Laser off0JG
L980724401:12:17Spike remains in signal, possibly a receiver problem890JG
L980724401:12:42Laser on again890JG
L980724401:17:00Telescope blocked1310JG
L980724401:18:49Telescope cover removed990JG
L980724401:20:05HG adjusted460JG
L980724401:20:58Beam input to dye laser blocked, signal disappeared460JG
L980724401:23:08Dye laser operating, signal still not observed930JG
L980724401:25:22Spike observed again730JG
L980724401:33:30Beam to wavemeter blocked, spike remains1150JG

Logsheet:1


Page : 115

Sondrestrom Lidar Operation Log


Log Sheet 2 of 2
Operators : J.Geddes
Date(s) : 980725 - 980725
File(s) : L9807244 - L9807244
FilesTime [UT]CommentsCntSOpe
L980724401:39:27Sodium beam directed away from telescope, spike disappears1670JG
L980724401:47:55Sodium PMT voltage reduced to 1750V500JG
L980724401:49:48Sodium beam converged into field of view of telescope670JG
L980724401:52:22Sodium PMT voltage reduced to 1650V0JG
L980724401:53:28Sodium PMT voltage up to 1950V again850JG
L980724402:01:03Large, hazy cloud overhead, Rayleigh beam visible930JG
L980724402:10:15Na beam blocked, spike disappears1150JG
L980724402:10:39Several lavender clouds on horizon, some banding observed1150JG
in hazy cloud overhead
L980724402:19:15End of experiment1200JG