Negative and positive values of Solar radiation during night

weather-file
solar-radiation
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I have some actual weather data that contains global solar radiation values. I have noticed that it has positive and negative values at night time, please see below. Should it be zero during night time or I am missing something?

P.S: The unit is wrong for global solar radiation.

Weather_filw

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Durr

asked 2016-01-06 11:57:49 -0500

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__AmirRoth__

updated 2020-01-20 13:36:16 -0500

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It probably should be zero but it is normal to have some small (depending on what the units really are) noise in the sensor reading. If this data were used in EnergyPlus it would be ignored when the sun's calculated position is not actually above the horizon.