SGP/BRS/C1 - SW Direct Normal incorrect

Apparent lightning strike in the instrument cluster area resulted in a failed NIP. Data 
are missing or incorrect.  

The SIRS was due for calibration change outs so the US, DS, DD and NIP were replaced. The 
updated program was loaded at approximately 06/14/2011 1739 GMT.

An estimate of direct normal values can be derived using the following formula:

short_direct_normal = (down_short_hemisp - down_short_diffuse_hemisp)/cos(zenith angle)

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
• short_direct_normal_std
• Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)

• inst_direct_normal

SGP/BRS/C1 - Tracker failure

Apparent lightning strike in the instrument cluster area resulted in a failed tracker. 
Site ops found the suntracker at home position, power cycled the suntracker and replaced 
fuse.

• down_short_diffuse_hemisp_std
• Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
• Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)

• inst_diffuse

SGP/EBBR/E19 - Nighttime data missing

Battery supply voltage was insufficient at night to power the system resulting in missing 
data.

• soil_heat_flow_1_mv
• soil_moisture_4_rr
• base_time
• soil_moisture_2_rr
• temp_air_left
• atmos_pressure_mv
• rh_left_mv
• time_offset
• soil_moisture_3_rr
• soil_heat_flow_3_mv
• soil_heat_flow_4_mv
• net_radiation_mv
• lat
• soil_temp_4_rr
• battery_voltage
• rh_right_mv
• soil_temp_1_rr
• temp_reference_rr
• soil_temp_2_rr
• soil_moisture_1_rr
• time
• alt
• temp_trh_right_rr
• home_signal
• soil_moisture_5_rr
• soil_temp_3_rr
• soil_moisture_1_r
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_moisture_4_r
• soil_moisture_3_r
• soil_moisture_2_r
• soil_temp_5_rr
• soil_moisture_5_r
• temp_trh_left_rr
• soil_heat_flow_5_mv
• lon
• temp_air_right
• soil_heat_flow_2_mv

• temp_trh_top
• time
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_std
• lon
• temp_trh_bottom
• Barometric Pressure(atmos_pressure)
• lat
• time_offset
• vapor_pressure_top
• home_signal
• vapor_pressure_bottom
• Radiation, net(net_radiation)
• alt
• base_time
• rh_top_fraction
• rh_bottom_fraction
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• temp_reference
• temp_air_top
• Wind speed vector mean(wspd_vec_mean)

• vapor_pressure_top
• time
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_trh_bottom
• soil_temp_5
• soil_temp_1
• soil_temp_2
• soil_temp_3
• soil_temp_4
• surface_soil_heat_flux_1
• soil_moisture_2
• surface_soil_heat_flux_2
• soil_moisture_1
• soil_moisture_4
• soil_moisture_3
• surface_soil_heat_flux_5
• surface_soil_heat_flux_3
• surface_soil_heat_flux_4
• rh_bottom_fraction
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• soil_moisture_5
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• base_time
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• temp_trh_top
• lon
• home_signal_30
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• energy_storage_change_4
• home_signal_15
• energy_storage_change_1
• Radiation, net(net_radiation)
• lat
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_2
• soil_heat_capacity_3
• wdir_vec_std
• soil_heat_capacity_1
• bowen_ratio
• Barometric Pressure(atmos_pressure)
• time_offset
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• alt
• vapor_pressure_bottom
• soil_heat_flow_4
• soil_heat_flow_5
• temp_air_bottom
• temp_reference
• temp_air_top
• rh_top_fraction
• corr_soil_heat_flow_5
• soil_heat_flow_1
• soil_heat_flow_2
• soil_heat_flow_3

SGP/EBBR/E20 - Sensible and latent heat fluxes overestimated

Net Radiation was too large resulting in overestimated sensible heat and latent heat 
fluxes.

• Radiation, net(net_radiation)

• Radiation, net(net_radiation)
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

SGP/BRS/C1 - Reprocess: Incorrect calibration coefficient for down_short_diffuse_hemisp

Applied calibration coefficient and serial number for down_short_diffuse was incorrect for 
the specified period.

Perform the following calculation to correct the data, 
DD= downwelling diffuse instrument:
Old Calibration coefficient = 114.74[W/m2\mV]
New Calibration Coefficient = 109.51[W/m2\mV]   
DD(new)[W/m2]=( DD(old)[W/m2]/ 114.74 [W/m2\mV] )* 109.51 [W/m2/mV]

• down_short_diffuse_hemisp_std
• Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
• Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)

• inst_diffuse