TWP/VCEIL/C2 - Power outage in I-Van resulted in Missing Data

I forgot to put in the daily report that we took the I van down yesterday to replace the 
fans in the Clary UPS. This was from 2300z on 24May03 to 0010z on 25May03. Instruments 
affected :

MPL
Ceilometer
MWR
WSI
TSI

Rex

• null(Raw data stream - documentation not supported)

• Aerosol backscatter coefficient at 355 nm(backscatter)
• Warning and alarm status bits(status_string)
• lon(lon)
• Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
• Laser temperature(laser_temperature)
• Altitude of highest signal(alt_highest_signal)
• 6 character string describing instrument measurement parameters(measurement_parameters)
• Second lowest cloud base height(second_cbh)
• GPS raw data filename(filename)
• Detection status. See details(detection_status)
• lat(lat)
• Dummy altitude for Zeb(alt)
• Flag indicating aeri retrieval status(status_flag)
• Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)
• Third cloud base height(third_cbh)
• base time(base_time)
• Lowest cloud base height detected.(first_cbh)
• range(range)
• Millivolts at internal ADC input (0 to 2500)(background_light)

• Flag indicating aeri retrieval status(status_flag)
• lon(lon)
• base time(base_time)
• Millivolts at internal ADC input (0 to 2500)(background_light)
• Aerosol backscatter coefficient at 355 nm(backscatter)
• Laser temperature(laser_temperature)
• Lowest cloud base height detected.(first_cbh)
• Altitude of highest signal(alt_highest_signal)
• Backscatter sum(sum_backscatter)
• Millivolts at internal ADC input(window_contamination)
• Degrees from vertical (0 to +90)(tilt_angle)
• range(range)
• Warning and alarm status bits(status_string)
• Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
• lat(lat)
• Vertical visibility(vertical_visibility)
• Detection status. See details(detection_status)
• Time offset of tweaks from base_time(time_offset)
• 6 character string describing instrument measurement parameters(measurement_parameters)
• Dummy altitude for Zeb(alt)
• Third cloud base height(third_cbh)
• Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)
• Second lowest cloud base height(second_cbh)
• GPS raw data filename(filename)

TWP/VCEIL/C3 - Data collection problem

There was a bad connection between the ceilometer and the instrument computer which 
resulted in a small amount of data loss on 8 days during the effected period.  The data that 
were collected are not effected by the problem.  On April 11, 34% of the data was lost and 
on April 1, 4% was lost.  On the remaining 6 days, May 1-6, the amount of data lost was 
less than 2%/day.

• null(Raw data stream - documentation not supported)

• Vertical visibility(vertical_visibility)
• Backscatter sum(sum_backscatter)
• Time offset of tweaks from base_time(time_offset)
• Second lowest cloud base height(second_cbh)
• base time(base_time)
• Laser temperature(laser_temperature)
• Altitude of highest signal(alt_highest_signal)
• Warning and alarm status bits(status_string)
• Millivolts at internal ADC input (0 to 2500)(background_light)
• lat(lat)
• Degrees from vertical (0 to +90)(tilt_angle)
• Lowest cloud base height detected.(first_cbh)
• Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)
• lon(lon)
• Aerosol backscatter coefficient at 355 nm(backscatter)
• Flag indicating aeri retrieval status(status_flag)
• Dummy altitude for Zeb(alt)
• Third cloud base height(third_cbh)
• 6 character string describing instrument measurement parameters(measurement_parameters)
• Millivolts at internal ADC input(window_contamination)
• Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
• range(range)
• Detection status. See details(detection_status)

TWP/VCEIL/C1 - Data dropouts

The Manus ceilometer was not receiving complete data packs from the ceilometer. This 
occurred at irregular intervals up to 3-10 times per hour until an error occurred and the 
computer locked up.  The data were not affected when they were successfully collected.  Days 
on which the data are missing for more than 1 hour are listed below.  Some maintenance 
was done on the ceilometer data computer in November and the computer was ultimately 
replace on 3 January 2005.

year.month.day
2004.09.29
2004.10.03
2004.10.04
2004.10.07
2004.10.10
2004.10.11
2004.10.12
2004.10.13
2004.10.14
2004.10.17
2004.10.18
2004.10.22
2004.10.25
2004.10.26
2004.10.27
2004.10.28
2004.10.29
2004.10.30
2004.11.15

• null(Raw data stream - documentation not supported)

• lat(lat)
• Vertical visibility(vertical_visibility)
• Aerosol backscatter coefficient at 355 nm(backscatter)
• Laser temperature(laser_temperature)
• Degrees from vertical (0 to +90)(tilt_angle)
• base time(base_time)
• Second lowest cloud base height(second_cbh)
• 6 character string describing instrument measurement parameters(measurement_parameters)
• Lowest cloud base height detected.(first_cbh)
• GPS raw data filename(filename)
• Backscatter sum(sum_backscatter)
• Millivolts at internal ADC input(window_contamination)
• Altitude of highest signal(alt_highest_signal)
• Millivolts at internal ADC input (0 to 2500)(background_light)
• range(range)
• Warning and alarm status bits(status_string)
• Time offset of tweaks from base_time(time_offset)
• Flag indicating aeri retrieval status(status_flag)
• Third cloud base height(third_cbh)
• Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
• Dummy altitude for Zeb(alt)
• lon(lon)
• Detection status. See details(detection_status)
• Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)