Data Quality Reports for Session: 103776 User: anderberg Completed: 01/18/2007

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D061120.1TWP/SKYRAD/C3 - NIP Failuretwpskyrad20sC3.a0, twpskyrad60sC3.b1


DQRID : D061120.1
Start DateStart TimeEnd DateEnd Time
11/16/2006200611/20/20060630
Subject:
TWP/SKYRAD/C3 - NIP Failure
DataStreams:twpskyrad20sC3.a0, twpskyrad60sC3.b1
Description:
Skyrad normal incident shortwave irradiance (NIP) started reporting impossible values for 
direct normal irradiance starting 16 November approx 2100GMT corresponding to a rain 
event at the same time.

The NIP was replaced fixing the problem.

Direct normal data are not recoverable.  However, the NIP data can be calculated from the 
global hemsipherical shortwave and global hemispherical diffuse datastreams by using the 
following relationship:
Global Horizontal = Direct Normal x cos(Z) + Diffuse Horizontal 
where Z is the zenith angle.
Measurements:twpskyrad60sC3.b1:
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer(short_direct_normal)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Standard Deviation(short_direct_normal_std)
twpskyrad20sC3.a0:
  • Instantaneous Direct Normal Shortwave Irradiance, Pyrheliometer Thermopile
    Voltage(inst_direct_normal)

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