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Citizen-Driven Solar Radiation Data Collection: Insights and Comparisons

This report presents an overview of the citizen-based solar radiation data collection network initiated in 2001, detailing the growth from 820 reporting stations in February 2008 to 914 by May 2009, reflecting a 55% annual increase. It compares data from these citizen stations with NOAA SurfRad sites and insights on solar radiation transducer performance. Important observations include the impact of sun angle on data accuracy and the reliability of reported measurements. This initiative has significant potential for both scientific research and educational projects.

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Citizen-Driven Solar Radiation Data Collection: Insights and Comparisons

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  1. SOLAR RADIATION DATA FROM CITIZEN SURFACE STATIONS WORLDWIDE Russell B. Chadwick NOAA ESRL Global Systems Division Boulder, CO Joseph R. Chadwick Lockheed Martin Colorado Springs, CO

  2. Key Points to be covered • Brief description of network • Solar radiation transducer comparisons • Comparison with 3 NOAA SurfRad sites • TENTATIVE conclusions

  3. Locations of citizen measurement of solar radiation

  4. Timeline of Related Events • 2001 – Started collecting WX data • 2002 – First solar radiation data • 2005 – 2300 stations reporting WX data • 2008 – 5000 stations reporting WX data • Jan 20 – decided to collect radiation data • Feb 18 – First day, 820 reporting stations • May 02 – 914 stations; 11.7% increase • 55% annual rate of increase in SR data

  5. Locations of US Citizen measurement of solar radiation

  6. Transducers Cost: $2300 $160 Weight: 7 lbs 0.9 lbs Material: Bronze, enamel PVC Plastic, UV res Size: 5.75” dia x 3.75” 6” x 4.25” x 3.25” Temp: 0.03% / º C 0.12% / º C Sensitivity: 9 µV / W/m² 1.67 mV / W/m² Vibration: 20 g NA

  7. Ten stations near SurfRad PSU

  8. April 12, 2009; non-linear response for CW8713

  9. Ten stations near SurfRad Bondville, IL

  10. Apr01 - Apr04, 2009; low response for CW5229

  11. Apr06 & Apr21, 2009Higher max response due to higher sun angle on Apr21.

  12. Apr16 - Apr19, 2009; shows closely spaced correlation

  13. TENTATIVE Conclusions • 10% - 15% of sites may be questionable • 85% - 90% approx. like SurfRad data • Cloudy day variation depends on distance • Higher max output for higher sun angle • Useful for scientific research • Useful for science fair projects • http://www.wxqa.com/lum_search.htm

  14. Boulder, CO Solar Data for May 12, 2009

  15. Boulder, CO Solar Data for May 11, 2009

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