NSA/MPL/C1 - laser head failure

On 2002-04-28 the laser energy was observed to decrease throughout the day.  Although low 
clouds continued to be detected, by the end of the day the output laser energy was about 
10% of nomimal.  This decrease continued throughout 2002-04-29 to the extent that clouds 
were no longer detected.  The source of failure was eventually determined to be the laser 
head, requiring the MPL to be shipped for repair.  The MPL was reinstalled on 2002-08-28 
at about 01:00 UTC.  

MPL NSA data from 2002-04-29 through 2002-08-27 (inclusive) should not be used.

• transceiver_altitude_angle
• base_time
• instrument_temp
• range_bin_time
• range
• filter_temp
• max_altitude
• time
• property
• Preliminary cloud base height above ground level(preliminary_cbh)
• alt
• scalar_sync_offset
• laser_scalar_sync_offset
• voltage_10
• voltage_15
• range_bin_width
• Pressure, associated geometric height, at altitude, NGM model output(height)
• lon
• range_bins
• energy_monitor
• range_offset
• shots_sum
• Backscatter(backscatter)
• shots_summed
• trigger_freq
• pulse_rep
• transceiver_azimuth_angle
• total_counts
• lat
• time_offset
• background_signal
• laser_temp
• detector_temp
• laser_sync_offset
• deadtime_correction
• voltage_05

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

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

• Raw data stream - documentation not supported