Jim Snyder and his students at Anderson Valley High School, in Boonville, CA, did an amazing high-altitude balloon launch during the annular eclipse this past spring. The balloon included a LabQuest, UVB Sensor, Anemometer, and two temperature sensors: a Thermocouple for external temperature readings (since they expected very low temperatures) and a Stainless Steel Temperature Probe in the balloon capsule.

The UVB data are especially interesting because they show a decrease in UVB during the eclipse.

UV level and external temperature during partial solar eclipse, taken from a high-altitude balloon

Here’s a video from the launch: