Dear Colleagues,

I need some help or literature on solar radiation instrumentation.  In
particular, I need to convert daily irradiance measurements from a
spherical (Bellani) net radiometer to global irradiance normal to a
horizontal surface for crop simulation applications in Southern India.
Intuitively, the response to diurnal and seasonal changes in solar
angles will clearly be different between a spherical and a flat sensor.
I assume that someone has worked out and validated an algorithm for
converting between the two sensor shapes.  I will be grateful for your
help.

Regards,
--
Dr. James W. Hansen
Associate Research Scientist - Agricultural Systems
International Research Institute for Climate Prediction
P.O. Box 1000
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USA

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