Cosmic ray intensity variations over the period 1972--1977 are studied using data registered by Detector C (E?80 MeV) on Pioneer 10 and the Sulphur Mountain neutron monitor (E> 400 MeV. The spacecraft data have been corrected for temperature, Radioisotope Thermoelectric Generators (RTG) background, and contamination by energetic solar particle events. The data during th 'encounter' with Jupiter have also been deleted. A consistent long-term solar cycle variation in intensity is observed in both data; however, in the neighbourhood of 5.1 AU an additional contribution to the interplanetary particle intensity is seen. This excess is attributed to energetic electrons (Ee>21 MeV) of Jovian origin in support of the more detailed results of Conlon on Jovian emitted electrons (3e<6 MeV). The spectral variation in long-term changes of the cosmic ray intensity is studied by a comparison of the low-energy (satellite) and high-energy (neutron monitor) data. An average value of 3.5¿0.2 for this ratio obtained for the interval 1972--1977 agrees well with the same value obtained for an earlier study, for the interval 1965--1972. However, there is indication that the ratio for short-term periods of a few rotations decreases for ~5.0 to ~1.0 during 1972--1977. Possible causes for this variation are suggested.