New Jovian source spectrum (solid line) and the corresponding simulated intensities at the Earth’s orbit (dashed line) at times of good magnetic connectivity to the source. Additional to the flyby spectra obtained by Pioneer 10 CPI and UlyssesCOSPIN-KET which were introduced to derive the source, here also the spectral data by SOHO-EPHIN (green), ISEE 3 (yellow), and the Ulysses COSPIN-KET (violet) data measured shortly after the launch are displayed, as documented in Table 1. While the SOHO-EPHIN spectrum is sampled over several time periods of good magnetic connectivity with the source, due to reasons explained in Sect. 3.2 the spectra obtained by ISEE 3 have to be included separately.