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. The radiation data collected by the Standard RadiationEnvironment Monitor (SREM) aboard ESA missions INTEGRAL (INTErnational Gamma-Ray Astrophysics Laboratory), Rosetta, Herschel,Planck and Proba-1, and by the high-energy neutron detector (HEND)instrument aboard Mars Odyssey, are analysed with an emphasis oncharacterising galactic cosmic rays (GCRs) in the inner heliosphere. Across calibration between all sensors was performed for this study, whichcan also be used in subsequent works. We investigate the stability of theSREM detectors over long-term periods. The radiation data are comparedqualitatively and quantitatively with the corresponding solar activity.Based on INTEGRAL and Rosetta SREM data, a GCR helioradial gradient of2.96 % AU −1 is found between 1 and 4.5 AU. In addition, the data during thelast phase of the Rosetta mission around comet 67P/Churyumov–Gerasimenkowere studied in more detail. An unexpected yet unexplained 8 %reduction of the Galactic Comic Ray flux measured by Rosetta SREM in thevicinity of the comet is noted.

Multi-point galactic cosmic ray measurements between 1 and 4.5 AU over a full solar cycle