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Fig. 3


Fraction of the mission time where the proton flux measured by SREM (F) is above a certain flux value. The proton fluxes (E> 120 MeV) are measured by the Solar Radiation Environment Monitor onboard Planck in the 20092013 time span. The flux drops rapidly around the mean value foreseen by Creme96 in the same timespan (vertical dashed line), while the second plateau (above ~3 cts cm-2 s-1) depicts the contribution of solar flares. The vertical dotted line shows the ACD threshold flux value where DT > 5%.

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