SGP/SIRS/E21 - Instrument logger time problem, Unknown

Values of diffuse hemispheric shortwave radiation differ from derived values by at most 70 
Wm^(-2).  The incident appears to be isolated to 3/21, 3/22, and 3/23. An estimation of 
solar noon using downwelling shortwave hemispheric irradiance from the PSP shows solar 
noon to oocur at around 1845GMT on 3/21. Calculated solar noon occurs at E21 at 1831GMT for 
3/21/2004.  There appears to be a time discrepancy in the datalogger for these dates.  
04/01 is the next date with enough sun to determine solar noon and compare to calculated.  
The data from this date appears correct.  Ronald Reed [rreed@ops.sgp.arm.gov] reports 
the logger did not receive any reportable time updates during the late March time period.  
We don't know what happened during these three dates but from 3/24 on data looks acceptable.

Disregard this data.

• inst_diffuse
• inst_down_long_hemisp_shaded_tp
• inst_up_long_dome_resist
• inst_up_long_hemisp_tp
• inst_down_long_shaded_case_resist
• inst_direct_normal
• inst_down_long_shaded_dome_resist
• inst_up_long_case_resist
• inst_up_short_hemisp
• inst_global
• time_offset

• Raw data stream - documentation not supported

• up_short_hemisp_max
• up_long_hemisp_min
• down_short_hemisp
• up_short_hemisp_std
• time_offset
• down_short_hemisp_std
• down_short_hemisp_max
• up_long_hemisp
• up_short_hemisp_min
• up_long_netir
• inst_down_long_shaded_dome_temp
• down_long_hemisp_shaded_min
• short_direct_normal_std
• down_long_hemisp_shaded
• short_direct_normal_max
• down_short_diffuse_hemisp_min
• inst_up_long_case_temp
• down_short_diffuse_hemisp_max
• short_direct_normal
• down_short_diffuse_hemisp
• up_short_hemisp
• down_long_hemisp_shaded_std
• down_long_hemisp_shaded_max
• down_short_diffuse_hemisp_std
• short_direct_normal_min
• up_long_hemisp_std
• up_long_hemisp_max
• down_long_netir
• inst_down_long_shaded_case_temp
• down_short_hemisp_min
• inst_up_long_dome_temp