The rate at which solar energy, at all wavelengths, is received per unit area at the top level of Earth's atmosphere. The solar constant actually varies by about 0.3% over the 11-year solar cycle but averages about 1,368 W/m2. Each planet has its own planetary solar constant, ranging from Mercury (9936.9 W/m2) to Pluto (0.87 W/m2).
Related category SOLAR TOPICS
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