its fairly constant,increasing only 0.2% at the peak of each 11
year solar cycle.
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ok
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The solar constant is the amount of incoming solar
electromagnetic radiation per unit area, measured on the outer
surface of Earth's atmosphere in a plane perpendicular to the
rays.
See link for formula
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1cal/cm2/min
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M. Alan Gibson has written:
'Solar constant (SOLCON) experiment' -- subject(s): Solar
constant, Aerospace telemetry