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Global Learning and Observations to Benefit the Environment is an educational international program with over 12,000 schools in ninety five countries and enables the students to collect observations about the environment and learn through an inquiry process. For more information, please visit the GLOBE website or OSSE's page for GLOBE Training.

What is a GLOBE Water Vapor Special Measurement? 
What is a Light Emitting Diode? 
What is a LED Sun Photometer? 
How does it work? Sun's Radiation at Top and Earth's Surface
Sun Photometer Detector Response
How do we know it "works"? 
How to use and build a Sun Photometer 
Where and how often should we obtain data? 
Additional Notes 
Sun Photometer Links 
Program Scientist: Sanjay Limaye