SGP/VCEIL/B1  - recurrent frequent data gaps

Beginning on 07/06/2003, frequent short-term data gaps began occurring. The situation 
continued to worsen until the PC locked up entirely on 07/14/2003.  After the computer was 
re-booted, the data gaps stopped and have not returned.  The problem appears to be 
restricted entirely to the computer and does not involve the ceilometer itself.  Thus, there 
appears to be no problem with the data records that were properly collected.

There is no way to recover the missing records.

• (Raw data stream - documentation not supported)

• Aerosol volume backscattering coefficient at 355 nm(backscatter)
• Altitude of highest signal(alt_highest_signal)
• Sum of detected and normalized backscatter(sum_backscatter)
• Third cloud base height(third_cbh)
• Distance to the center of the corresponding range bin(range)
• Millivolts at internal ADC input (0 to 2500)(background_light)
• Parameter scale(parameter_scale)
• 6 character string describing instrument measurement parameters(measurement_parameters)
• Starting elevations(altitude_tags)
• Raw data filename(filename)
• Second lowest cloud base height(second_cbh)
• Detection status.(detection_status)
• Warning, alarm, and internal status information(status_string)
• Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)
• Window contamination(window_contamination)
• Vertical visibility(vertical_visibility)
• lon(lon)
• Lowest cloud base height detected.(lowest_cloud_base_ht)
• Time offset from base_time(time_offset)
• Laser temperature(laser_temperature)
• Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
• base time in epoch(base_time)
• North Latitude(lat)
• Flag indicating aeri retrieval status(status_flag)
• Degrees from vertical (-15 to +90)(tilt_angle)
• -180.0 - +180.0(alt)
• Lowest cloud base height detected(first_cbh)

• Sum of detected and normalized backscatter(sum_backscatter)
• Laser temperature(laser_temperature)
• Distance to the center of the corresponding range bin(range)
• Time offset from base_time(time_offset)
• Altitude of highest signal(alt_highest_signal)
• Second lowest cloud base height(second_cbh)
• Detection status.(detection_status)
• -180.0 - +180.0(alt)
• Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)
• Vertical visibility(vertical_visibility)
• North Latitude(lat)
• Third cloud base height(third_cbh)
• Lowest cloud base height detected(first_cbh)
• Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
• lon(lon)
• Aerosol volume backscattering coefficient at 355 nm(backscatter)
• Window contamination(window_contamination)
• 6 character string describing instrument measurement parameters(measurement_parameters)
• Flag indicating aeri retrieval status(status_flag)
• Millivolts at internal ADC input (0 to 2500)(background_light)
• Degrees from vertical (-15 to +90)(tilt_angle)
• base time in epoch(base_time)
• Warning, alarm, and internal status information(status_string)