Wednesday, July 26th, 2017, at 7:47 am PDT

Solar Radiance

Solar radiance is measured by an Apogee Instruments SP-100 pyranometer.

The Past Week

Today's solar radiance, read and logged every 1790 seconds, is graphed in red. Shown in black is the theoretical solar radiance. Places where the actual radiance dips below the theoretical are the result of cloud cover. Scant, passing clouds create sharp spikes, while persistant cloud cover will show as a more prominent dip. Also shown below are the minimum and maximum values for the past week, in blue for comparison.



This Date in Past Years

Here the current solar radiance and theoretical values are compared to the minimum and maximum values on this date each year since 2012.



The Millikan Library Webcam

A webcam on the 9th floor of Millikan Library provides a live view of the skies over Caltech. Click to enlarge.

Looking south, towards Linde + Robinson and the weather station.
Looking north, towards the San Gabriel Mountains.

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