SGP/MPL/C1 - Reduced detection sensitivity

During the time periods indicated, the laser power supply was low.  This resulted in 
compromised detection sensitivity, particularly for thin clouds and/or during daylight hours.  
That is, some clouds may not have been identified.  The low laser power would not have 
resulted in false positives.

• Preliminary cloud base height(preliminary_cbh)

• MPL Cloth et al. Algorithm Significance Mask(SigniMaskMplCloth)

• MPL Cloth et al. Algorithm Cloud Mask(CloudMaskMplCloth)

• Cloud mask(cloud_mask_2)
• Flag indicating whether the beam was extinguished at indicated cloud top(cloud_top_attenuation_flag)
• Cloud mask(cloud_mask_1)
• Cloud base height, measured by MPL(cloud_base_height)
• cloud top height(cloud_top_height)

SGP/MPL/C1 - Sensor Calibration

The Energy Monitor records the value of the laser energy. During the time in question, the 
laser energy exceed the maximum value in the calibration table for the energy monitor. 
In other words, the value is pegged. This condition does not affect the backscatter 
signal. But it will prevent users from normalizing the backscatter signal to the laser output.

• null(Raw data stream - documentation not supported)

• Laser output energy per pulse(energy_monitor)

SGP/MPL/C1 - Instrument offline

Instrument was taken offline due to a failure of the laser power supply.  Data are missing 
and unrecoverable.

• base time(base_time)
• Preliminary cloud base height(preliminary_cbh)
• Maximum altitude retrieved from multichannel scalar card.(max_altitude)
• Time offset of tweaks from base_time(time_offset)
• Detector Temperature(detector_temp)
• Repetition rate, or Trigger Frequency of the laser(trigger_freq)
• lat(lat)
• range(range)
• Number of laser shots recorded(shots_summed)
• value represents date of last configuration change as yyyymmdd(property)
• Background Signal(background_signal)
• Aerosol backscatter coefficient at 355 nm(backscatter)
• Amount of time the actual laser pulse lags behind the sync trigger(laser_sync_offset)
• Voltage level which operates the thermistor(voltage_10)
• Array of heights for the range gates(height)
• Time in nanoseconds for each range bin of multichannel scalar card.(range_bin_time)
• Number of laser pulses summed during measurement interval(shots_sum)
• Amount of time the scalar lags behind the sync trigger(scalar_sync_offset)
• Laser Temperature(laser_temp)
• Angle of inclination with respect to horizontal(transceiver_altitude_angle)
• Distance from leading edge of first range bin to the center of each bin .(range_bins)
• effective range offset due to poor sync between laser firing and A/D trigger.(range_offset)
• Repetition Rate, or Trigger Frequency of the laser(pulse_rep)
• Angle of orientation with respect to true geographic north(transceiver_azimuth_angle)
• Laser output energy per pulse(energy_monitor)
• Instrument Temperature(instrument_temp)
• Amount of time laser pulse lags behind the scalar trigger(laser_scalar_sync_offset)
• Dummy altitude for Zeb(alt)
• Width of range-bins calculated from range_bin_time(range_bin_width)
• time(time)
• required to correct raw counts for detector deadtime prior to all other
  corrections.(deadtime_correction)
• Voltage level which operates the energy monitor(voltage_15)
• Sum of raw backscatter counts per bin prior to ANY corrections.(total_counts)
• Filter Temperature(filter_temp)
• Voltage level which operates the A/D card and the detector(voltage_05)
• lon(lon)

• base time(base_time)
• Height of Center of Each Range Bin(Heights)
• MPL Cloth et al. Algorithm Significance Mask(SigniMaskMplCloth)
• Time offset of tweaks from base_time(time_offset)

• base time(base_time)
• MPL Cloth et al. Algorithm Cloud Mask(CloudMaskMplCloth)
• Time offset of tweaks from base_time(time_offset)
• Height of Center of Each Range Bin(Heights)

• Background Signal(background_signal)
• Instrument Temperature(instrument_temp)
• Time offset of tweaks from base_time(time_offset)
• Cloud base height, measured by MPL(cloud_base_height)
• Laser output energy per pulse(energy_monitor)
• lat(lat)
• Cloud mask(cloud_mask_2)
• Array of heights for the range gates(height)
• Number of laser shots recorded(shots_summed)
• Repetition Rate, or Trigger Frequency of the laser(pulse_rep)
• The update time of the historical baseline used for the cloud boundary
  determination of this sample(baseline_update_time)
• cloud top height(cloud_top_height)
• Aerosol backscatter coefficient at 355 nm(backscatter)
• Flag indicating whether the beam was extinguished at indicated cloud top(cloud_top_attenuation_flag)
• Detector Temperature(detector_temp)
• Laser Temperature(laser_temp)
• Cloud mask(cloud_mask_1)
• lon(lon)
• base time(base_time)
• Relative random error in backscatter profiles(random_error)
• Dummy altitude for Zeb(alt)