Long-term variations of atmospheric transmittance from ... - GEWEX
Long-term variations of atmospheric transmittance from ... - GEWEX
Long-term variations of atmospheric transmittance from ... - GEWEX
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Direct solar radiation measurements in Japan<br />
• JMA has been conducting direct solar radiation measurements by<br />
pyrheliometers since International Polar Year (I.P.Y.) in 1932.<br />
• Although the number <strong>of</strong> observation stations differs by age, the<br />
measurements were conducted at 14 stations, which covered all<br />
climatic zones in Japan, for a long time.<br />
• The direct solar radiation was measured 3 times a day at 09, 12 and 15<br />
Local Apparent Time (LAT) when there was no cloud in the direction <strong>of</strong><br />
the sun.<br />
BSRN station <br />
A map <strong>of</strong> 14 stations <strong>of</strong> direct solar radiation measurement in Japan used in this study.
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