Apogee Instruments MQ-500 - Clear Sky Calculator Tool

Homepage of the Clear
Sky Calculator. Two
calculators are available:
one for quantum sensors
(PPFD) and one for
pyranometers (total
shortwave radiation).
Clear Sky Calculator for
quantum sensors. Site
data are input in blue
cells in middle of page
and an estimate of PPFD
is returned on right-hand
side of page.