NSA/SKYRAD/C2 - wrong calibration coefficent for PIRd in ATQ

Due to confusion over ARM calibration policy, a revised calibration was installed
and was in place for the duration of the time period indicated.  When the error
was noted, the original calibration was re-installed.

Users may notice discontinuities in PIRd data at the time boundaries of this
DQR.

• Instantaneous Downwelling Pyrgeometer Thermopile Voltage, Shaded Pyrgeometer(inst_down_long_hemisp_shaded_tp)

• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
  Deviation(down_long_hemisp_shaded_std)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)

• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
  Deviation(down_long_hemisp_shaded_std)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

NSA/SKYRAD/C1 - reprocess: PIR identified as unshaded is really shaded

On 5/15/02 the Global PIR was moved from the unshaded
position on the Skyrad stand to a shaded spot on the
tracker.  It is still using the same Logger channel as
it did as an unshaded PIR even though it is now shaded.

• Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer, Minima(down_long_hemisp_unshaded_min)
• Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer, Standard
  Deviation(down_long_hemisp_unshaded_std)
• Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer, Maxima(down_long_hemisp_unshaded_max)
• Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer(down_long_hemisp_unshaded)

NSA/SKYRAD/C1 - Unshaded PIR data unreasonable

Periods of very large negative values. 
Negative readings of thermistors caused concurrent calculation 
in logger of temperature to fail.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

NSA/SKYRAD/C1 - Unshaded PIR maintenance

During this time, the PIR unshaded was swapped on the SKYRAD stand.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)
• PIR1 unshaded standard deviation(pir1_sd)

NSA/SKYRAD/C1 - PIR data suspect

PIR shaded and PIR unshaded show unusual differences during this time period, frosting or 
icing is the most probable explanation but we don't know for sure.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

NSA/SKYRAD/C1 - PIR data suspect

PIR shaded and PIR unshaded show unusual differences during this time period, frosting or 
icing is the most probable explanation but we don't know for sure.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)
• PIR1 unshaded standard deviation(pir1_sd)

NSA/SKYRAD/C1 - Shaded PIR data unreasonable

Scientificly unreasonable data values, the problem disappeared after the datalogger was 
exchanged with the spare. The data logger was exchanged on 11/7 at 20:10 GMT.

• PIR shaded maximum(pirs_max)
• PIR shaded standard deviation(pirs_sd)
• PIR shaded minimum(pirs_min)
• PIR shaded mean(pirs_mean)

• PIR shaded mean(pirs_mean)
• PIR shaded minimum(pirs_min)
• PIR shaded maximum(pirs_max)
• PIR shaded standard deviation(pirs_sd)

NSA/SKYRAD/C1 - Shaded PIR data unreasonable

Periods of very large negative values. 
Negative readings of thermistors causes concurrent calculation 
in logger of temperature to fail.

• PIR shaded maximum(pirs_max)
• PIR shaded standard deviation(pirs_sd)
• PIR shaded minimum(pirs_min)
• PIR shaded mean(pirs_mean)

NSA/SKYRAD/C1 - Corrupted Shaded PIR data

Erroneous data due to file truncation problem during logger download and corresponding 
ingest problems when the truncated lines were read. Problem was identified in a PIF 
submitted by Rune Storvold

• PIR shaded maximum(pirs_max)
• PIR shaded standard deviation(pirs_sd)
• PIR shaded minimum(pirs_min)
• PIR shaded mean(pirs_mean)

NSA/SKYRAD/C1 - Shaded PIR data unreasonable

There was  a 10-25 W/m2 spike in data probably due to operator working around instrument 
or cleaning it.

• PIR shaded maximum(pirs_max)
• PIR shaded standard deviation(pirs_sd)
• PIR shaded minimum(pirs_min)
• PIR shaded mean(pirs_mean)

NSA/SKYRAD/C1 - Unshaded and Shaded PIR data bad

Large unreasonable spikes and some missing data points. Cause of problem unknown.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR shaded maximum(pirs_max)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR shaded standard deviation(pirs_sd)
• PIR1 unshaded mean(pir1_mean)
• PIR shaded minimum(pirs_min)
• PIR shaded mean(pirs_mean)

NSA/SKYRAD/C1 - Unshaded and Shaded PIR data bad

Data during this time period is corrupted (seen as a dip in the measurements). During this 
time, the PIR unshaded was being replaced on the SKYRAD stand.
This work affected the shaded PIR as well due to the presence of the operators in it's 
field of view.

• PIR shaded standard deviation(pirs_sd)
• PIR1 unshaded maximum(pir1_max)
• PIR shaded minimum(pirs_min)
• PIR shaded mean(pirs_mean)
• PIR1 unshaded standard deviation(pir1_sd)
• PIR shaded maximum(pirs_max)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded mean(pir1_mean)

• PIR1 unshaded maximum(pir1_max)
• PIR shaded mean(pirs_mean)
• PIR shaded maximum(pirs_max)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded mean(pir1_mean)
• PIR shaded minimum(pirs_min)
• PIR1 unshaded standard deviation(pir1_sd)
• PIR shaded standard deviation(pirs_sd)

NSA/SKYRAD/C1 - PIR data suspect

PIR shaded and PIR unshaded show unusual differences during this time period, frosting or 
icing is one possible explanation but we don't know.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR shaded maximum(pirs_max)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR shaded standard deviation(pirs_sd)
• PIR1 unshaded mean(pir1_mean)
• PIR shaded minimum(pirs_min)
• PIR shaded mean(pirs_mean)

NSA/SKYRAD/C1 - Corrupted Unshaded PIR data

Erroneous data due to file truncation problem during logger download and corresponding 
ingest problems when the truncated lines were read. Problem was identified in a PIF 
submitted by Rune Storvold

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

NSA/SKYRAD/C1 - PIR data suspect

PIR shaded and PIR unshaded show unusual differences during this time period, frosting or 
icing is one possible explanation but we don't know.

• PIR shaded standard deviation(pirs_sd)
• PIR1 unshaded maximum(pir1_max)
• PIR shaded minimum(pirs_min)
• PIR shaded mean(pirs_mean)
• PIR1 unshaded standard deviation(pir1_sd)
• PIR shaded maximum(pirs_max)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded mean(pir1_mean)

• PIR1 unshaded maximum(pir1_max)
• PIR shaded mean(pirs_mean)
• PIR shaded maximum(pirs_max)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded mean(pir1_mean)
• PIR shaded minimum(pirs_min)
• PIR1 unshaded standard deviation(pir1_sd)
• PIR shaded standard deviation(pirs_sd)

NSA/SKYRAD/C1 - Shaded PIR data suspect

The instrument had incorrect calibration settings on two accounts: 1. From 12/09 to 12/12, 
the calibration was set incorrectly. 2. The dome correction coefficients were not 
properly set until the early morning of 12/14. The erroneous settings caused an error probably 
less than 4%.

• PIR shaded maximum(pirs_max)
• PIR shaded standard deviation(pirs_sd)
• PIR shaded minimum(pirs_min)
• PIR shaded mean(pirs_mean)

NSA/SKYRAD/C1 - PIR data suspect

The PIR unshaded and the PIR shaded have a persistent offset between them, ranging from 0 
to 10 W/m2. It is particularly apparent during clear sky. The line of sight of the PIRd 
is obstructed making it difficult to assess the problem. The instrument was moved to its 
proper location in early February. The problem seems to have resolved itself with the move.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR shaded maximum(pirs_max)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR shaded standard deviation(pirs_sd)
• PIR1 unshaded mean(pir1_mean)
• PIR shaded minimum(pirs_min)
• PIR shaded mean(pirs_mean)

NSA/SKYRAD/C1 - Shaded PIR data incorrect

There were two sudden increases (about 50-100 W/m2) at 23:00 and 24:00.

• PIR shaded maximum(pirs_max)
• PIR shaded standard deviation(pirs_sd)
• PIR shaded minimum(pirs_min)
• PIR shaded mean(pirs_mean)

NSA/SKYRAD/C1 - Spikes in Unshaded PIR data

There was  a 10-25 W/m2 spike in data probably due to operator working around instrument 
or cleaning it.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

NSA/SKYRAD/C1 - Discontinuity in Unshaded PIR data

There was a sudden increase in irradiance (from 140 to 190 W/m2) at 02/03/99 23:00.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

NSA/SKYRAD/C1 - Unshaded PIR data incorrect

Data from this time period is incorrect because instrument was swapped out for 
calibration and correct calibrations were not entered for replacement.  Some 
missing data during this time interval as well

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

NSA/SKYRAD/C1 - Unshaded PIR maintenance

Unreasonable data from 3/15 23:45 until 3/16 0:45 due to exchange of PIR instrument to the 
PIR spare (32054F3). This was done so the PIR could go to NOAA/CMDL in Boulder for 
calibration as part of the IPARSC II IOP and be included in this work.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)
• PIR1 unshaded standard deviation(pir1_sd)

NSA/SKYRAD/C1 - Miscalibrated Unshaded PIR data

Calibration coefficient for PIR spare (32054F3) was updated on 3/25 2:35 GMT. The old PIR 
cal coefficient was used during this period. The PIR spare (32054F3) was calibrated by 
NOAA/CMDL in Boulder prior to the IOP and replacement on 3/16 when the original station PIR 
was shipped to Boulder for a post IOP calibration.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)
• PIR1 unshaded standard deviation(pir1_sd)

NSA/SKYRAD/C1 - Noise in Unshaded PIR data

Noise increased and an offset from shaded PIR became apparent during this period.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)
• PIR1 unshaded standard deviation(pir1_sd)

NSA/SKYRAD/C1 - Unshaded PIR maintenance

A new PIR was installed during  this time period by Phil Utley.

• PIR1 unshaded standard deviation(pir1_sd)
• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)

• PIR1 unshaded minimum(pir1_min)
• PIR1 unshaded maximum(pir1_max)
• PIR1 unshaded mean(pir1_mean)
• PIR1 unshaded standard deviation(pir1_sd)

NSA/SKYRAD/C1 - NIP shaded by skyrad stand around local midnight

Around local midnight 9:30-10:30 GMT during summer clear sky the normal incidence 
pyranometer is shaded by the instrument stand.This causes the reading to be 0 W/m2. If cosine 
correction is applied for irradiance calulations this effect is negligible due to the low 
solar angle.

• NIP maximum(nip_max)
• NIP standard deviation(nip_sd)
• NIP minimum(nip_min)
• NIP mean(nip_mean)

NSA/SKYRAD/C1 - NIP shaded by skyrad stand around local midnight

Around local midnight 9:30-10:30 GMT during summer clear sky the normal incidence 
pyranometer is shaded by the instrument stand.This causes the reading to be 0 W/m2. If cosine 
correction is applied for irradiance calulations this effect is negligible due to the low 
solar angle.

• NIP maximum(nip_max)
• NIP standard deviation(nip_sd)
• NIP minimum(nip_min)
• NIP mean(nip_mean)

• NIP maximum(nip_max)
• NIP standard deviation(nip_sd)
• NIP minimum(nip_min)
• NIP mean(nip_mean)

NSA/SKYRAD/C1 - PSP shaded by MFRSR after local midnight

Just past local midnight (11:00-11:40 GMT during summer clear sky) the global 
hemispherical pyranometer is shaded by the MFRSR instrument for about 40 minutes. This causes the 
reading to be 0 W/m2. This effect would be negligible in a daily average due to the low 
solar angle.

• PSP1 unshaded mean(psp1_mean)
• PSP1 unshaded minimum(psp1_min)
• PSP1 unshaded maximum(psp1_max)
• PSP1 unshaded standard deviation(psp1_sd)

NSA/SKYRAD/C1 - PSP shaded by MFRSR after local midnight

Just past local midnight (11:00-11:40 GMT during summer clear sky) the global 
hemispherical pyranometer is shaded by the MFRSR instrument for about 40 minutes. This causes the 
reading to be 0 W/m2. This effect would be negligible in a daily average due to the low 
solar angle.

• PSP1 unshaded mean(psp1_mean)
• PSP1 unshaded minimum(psp1_min)
• PSP1 unshaded maximum(psp1_max)
• PSP1 unshaded standard deviation(psp1_sd)

• PSP1 unshaded maximum(psp1_max)
• PSP1 unshaded standard deviation(psp1_sd)
• PSP1 unshaded mean(psp1_mean)
• PSP1 unshaded minimum(psp1_min)

NSA/SKYRAD/C1: Noisy PIR data at Barrow

PIR1 data is noisy throughout the entire period, though there is still a definite signal 
through the noise.

• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
  Deviation(down_long_hemisp_shaded_std)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)

• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
  Deviation(down_long_hemisp_shaded_std)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)

NSA/SKYRAD/C1 - IRT measurements during precipitation events

The IRT measurement of sky/cloud temperature was in question during precipitation events 
because rain or snow could accumulate in the upward-pointed lens barrel. This was 
corrected by reorienting the IRT to measure the sky temperature as reflected by a gold mirror.

• Sky/Cloud Infra-Red Temperature(sky_ir_temp)
• Sky/Cloud Infra-Red Temperature Standard Deviation(sky_ir_temp_std)
• Sky/Cloud Infra-Red Temperature Maxima(sky_ir_temp_max)
• Sky/Cloud Infra-Red Temperature Minima(sky_ir_temp_min)

NSA/SKYRAD/C1 - IRT failed

• Sky/Cloud Infra-Red Temperature(sky_ir_temp)
• Sky/Cloud Infra-Red Temperature Standard Deviation(sky_ir_temp_std)
• Sky/Cloud Infra-Red Temperature Maxima(sky_ir_temp_max)
• Sky/Cloud Infra-Red Temperature Minima(sky_ir_temp_min)

• Sky/Cloud Infra-Red Temperature Minima(sky_ir_temp_min)
• Sky/Cloud Infra-Red Temperature Maxima(sky_ir_temp_max)
• Sky/Cloud Infra-Red Temperature Standard Deviation(sky_ir_temp_std)
• Sky/Cloud Infra-Red Temperature(sky_ir_temp)

NSA/SKYRAD/C1 - IRT incorrectly configured

The IRT was removed for repair and replaced with a
spare that was not configured properly.  Data are incorrect.

• Sky/Cloud Infra-Red Temperature(sky_ir_temp)
• Sky/Cloud Infra-Red Temperature Standard Deviation(sky_ir_temp_std)
• Sky/Cloud Infra-Red Temperature Maxima(sky_ir_temp_max)
• Sky/Cloud Infra-Red Temperature Minima(sky_ir_temp_min)

• Sky/Cloud Infra-Red Temperature Minima(sky_ir_temp_min)
• Sky/Cloud Infra-Red Temperature Maxima(sky_ir_temp_max)
• Sky/Cloud Infra-Red Temperature Standard Deviation(sky_ir_temp_std)
• Sky/Cloud Infra-Red Temperature(sky_ir_temp)

NSA/SKYRAD/C1 - NSA B&W nighttime offset in Barrow too large

This problem only became apparent as NSA C1 nights became long enough for full darkness. 
The shaded global diffuse instrument (Eppley 8-48) showed a negative nighttime offset 
larger than the expected 0 to -4 W/m2. Typically -5 to -8 W/m2. This size of offset is not 
uncommon with Eppley PSPs but not observed with Eppley 8-48s.  The problem was corrected 
with replacement of mounting screws which were creating a ground loop.

• PSP shaded minimum(psps_min)
• PSP shaded maximum(psps_max)
• PSP shaded mean(psps_mean)
• PSP shaded standard deviation(psps_sd)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Minima(down_short_diffuse_hemisp_min)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Maxima(down_short_diffuse_hemisp_max)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Standard Deviation(down_short_diffuse_hemisp_std)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Minima(down_short_diffuse_hemisp_min)
• PSP shaded maximum(psps_max)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Maxima(down_short_diffuse_hemisp_max)
• PSP shaded minimum(psps_min)
• PSP shaded mean(psps_mean)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
• PSP shaded standard deviation(psps_sd)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Standard Deviation(down_short_diffuse_hemisp_std)

NSA/SKYRAD/C1 - Noisy PIR data at Barrow

PIR1 data is noisy throughout the entire period, though there is still a definite signal 
through the noise.

• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Minima(down_long_hemisp_shaded1_min)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Standard
  Deviation(down_long_hemisp_shaded1_std)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Maxima(down_long_hemisp_shaded1_max)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1(down_long_hemisp_shaded1)

• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Standard
  Deviation(down_long_hemisp_shaded1_std)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Minima(down_long_hemisp_shaded1_min)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1(down_long_hemisp_shaded1)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Maxima(down_long_hemisp_shaded1_max)

NSA/SKYRAD - Barrow SKYRAD PIRD Misconfiguration 12/9 - 12/12/98

The PIRD was incorrectly set from 12/9/98 to 12/12/98 that resulted in an 
error of approximately 3.7% (was set to 243902 instead of 235294).

• east longitude for all the input platforms.(lon)
• Instantaneous UVB temperature(uvb_temp)
• Instantaneous UVB uncorrected irradiance(uvb_uncorr_irradiance)
• north latitude for all the input platforms.(lat)
• altitude above sea levelaltunits(alt)
• Instantaneous PIR2 uncorrected irradiance(pir2_uncorr_irradiance)
• Instantaneous PIR1 uncorrected irradiance(pir1_uncorr_irradiance)
• Instantaneous PIR2 case thermistor(pir2_case_therm)
• Instantaneous PIR1 dome thermistor(pir1_dome_therm)
• Instantaneous PIR2 dome thermistor(pir2_dome_therm)
• Time offset of tweaks from base_time(time_offset)
• Time offset from base_time(base_time)
• GPS raw data filename(filename)
• Instantaneous PIR1 case thermistor(pir1_case_therm)

• PSP shaded minimum(psps_min)
• PIR1 unshaded maximum(pir1_max)
• IRT1 minimum(irt1_min)
• PSP shaded standard deviation(psps_sd)
• NIP mean(nip_mean)
• PIR1 unshaded standard deviation(pir1_sd)
• NIP maximum(nip_max)
• Time offset of tweaks from base_time(time_offset)
• UVB minimum(uvb_min)
• PSP shaded maximum(psps_max)
• PIR shaded standard deviation(pirs_sd)
• PSP shaded mean(psps_mean)
• Bit data. See details.(bit_data)
• PIR shaded minimum(pirs_min)
• IRT1 mean(irt1_mean)
• Time offset from base_time(base_time)
• PSP1 unshaded mean(psp1_mean)
• altitude above sea levelaltunits(alt)
• PSP1 unshaded minimum(psp1_min)
• PIR1 unshaded minimum(pir1_min)
• NIP standard deviation(nip_sd)
• Internal Logger Temperature(logger_temp)
• PSP1 unshaded standard deviation(psp1_sd)
• IRT1 maximum(irt1_max)
• UVB mean(uvb_mean)
• PSP1 unshaded maximum(psp1_max)
• UVB maximum(uvb_max)
• PIR shaded maximum(pirs_max)
• PIR1 unshaded mean(pir1_mean)
• External voltage(external_voltage)
• IRT1 standard deviation(irt1_sd)
• Internal voltage(internal_voltage)
• GPS raw data filename(filename)
• NIP minimum(nip_min)
• north latitude for all the input platforms.(lat)
• PIR shaded mean(pirs_mean)
• east longitude for all the input platforms.(lon)
• UVB standard deviation(uvb_sd)

NSA/SKYRAD/C1 - IRT removed for repair

The instrument was damaged by internal water condensation caused by the 
exterior foam insulation used to keep the IRT above freezing. It was returned 
in July 1998 to the manufacturer for repair.

• IRT1 maximum(irt1_max)
• IRT1 standard deviation(irt1_sd)
• IRT1 minimum(irt1_min)
• IRT1 mean(irt1_mean)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

NSA/SKYRAD/C1 - IRT insufficiently insulated

IRT was reinstalled with insufficient insulation to maintain an
internal reference temperature above 0 degrees C.

• IRT1 maximum(irt1_max)
• IRT1 standard deviation(irt1_sd)
• IRT1 minimum(irt1_min)
• IRT1 mean(irt1_mean)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

NSA/SKYRAD/C1 - IRT insufficiently insulated

IRT was reinstalled with insufficient insulation to maintain an
internal reference temperature above 0 degrees C.

• IRT1 maximum(irt1_max)
• IRT1 standard deviation(irt1_sd)
• IRT1 minimum(irt1_min)
• IRT1 mean(irt1_mean)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

NSA/SKYRAD/C1 - IRT removed from service

Instrument was removed to check performance.

• IRT1 maximum(irt1_max)
• IRT1 standard deviation(irt1_sd)
• IRT1 minimum(irt1_min)
• IRT1 mean(irt1_mean)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

NSA/SKYRAD/C1 - IRT insufficiently heated

IRT had insufficient heating to maintain an internal reference temperature above 0 degrees 
C. Measurements of sky temperature were over-estimated when instrument was below 
freezing.

• IRT1 maximum(irt1_max)
• IRT1 standard deviation(irt1_sd)
• IRT1 minimum(irt1_min)
• IRT1 mean(irt1_mean)