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Remote Sensing from Space

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The level2 daily mean DIARAD Total Solar Irradiance

    This is the data as measured by the left channel of the DIARAD radiometer after ageing correction by the right channel.

 
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The daily mean DIARAD Total Solar Irradiance

This is the data as measured by both channels of the DIARAD radiometer.

 

'left': daily mean left channel measurements - the left channel is measuring continuously 'right': right channel measurements minus 5 W/m2 - the right channel is measuring sporadically for verification of the ageing of the left channel

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The DIARAD ageing correction

   The operational measurements are made with the DIARAD Left channel. From time to time - roughly every month - measurements are made with the DIARAD Right channel. The difference between the Right and the Left channel measurements, shown below, provides a measurement of the ageing of the Left channel.

 

'measured' : measured Right minus Left TSI, normalised to zero at the beginning of the mission. 'fit' : running mean of measured points - The DIARAD Left measurements are corrected for ageing by adding this fit.

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