DQRs for Session: 105355 User:sbensonCompleted: 04-24-2007

Data Quality Reports for Session: 105355 User: sbenson Completed: 04/24/2007

TABLE OF CONTENTS

DQR ID	Subject	Data Streams Affected
D061120.1	TWP/SKYRAD/C3 - NIP Failure	twpskyrad20sC3.a0, twpskyrad60sC3.b1
D061214.1	TWP/SKYRAD/C3 - NIP instrument failure	twpskyradC3.00, twpskyrad20sC3.a0, twpskyrad60sC3.b1

DQRID : D061120.1

Start Date	Start Time	End Date	End Time
11/16/2006	2006	11/20/2006	0630

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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DQRID : D061214.1

Start Date	Start Time	End Date	End Time
12/13/2006	0342	01/16/2007	0440

Subject:	TWP/SKYRAD/C3 - NIP instrument failure
DataStreams:	twpskyradC3.00, twpskyrad20sC3.a0, twpskyrad60sC3.b1
Description:	The NIP (Short Direct Normal) was replaced after it displayed symptoms of failure associated with either unknown precipitation related issues or a possible lightning strike. NIP data are not recoverable. Direct normal data can be reconstructed from global hemispheric and global diffuse data using the following relationship: global hemispheric = direct*cos(sza) + diffuse hemispheric
Measurements:	twpskyradC3.00: Raw data stream - documentation not supported(Raw data stream - documentation not supported) 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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