Total solar irradiance as measured by the SOVAP radiometer onboard PICARD | Journal of Space Weather and Space Climate

Brightness Variations of the Sun and Sun-like Stars and Resulting Influences on their Environments

Open Access

Fig. 2.

The blue curve corresponds to the “zero solar flux” on the open cavity (K_Rad10). The PICARD spacecraft is in a sun-synchronous orbit and goes into Earth eclipse seasons from November to February. During these eclipses, the spacecraft passes into the penumbra (solar flux through the Earth atmosphere) and the umbra of the Earth that implies high variability of P_cl,l− P_o,r.

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