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Fig. 5.


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Top: Flux measured by ALTEA in the three directions both in the whole orbit (empty symbols) and in the high latitude passes (HL, full symbols). The five most evident Solar Particle Events (SPEs) are indicated with an arrow. The dotted line serves as a guide for the eyes to follow the mean steady decrease of the flux linked to the solar cycle modulation. Bottom: Altitude of the ISS from the ancillary data acquired concurrently with the ALTEA measurements (above in red); solar cycle as described by the MgII index (middle, in blue); flux of the energetic (>100 MeV) protons, as measured by GOES (lowest, in green); The P1–P5 segments indicate the periods that the detector system ALTEA spent in the five different positions during the experiments ALTEA-shield/survey (P1–P4) and ALTEA-shield/shield (P5).

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