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In this paper, we consider an underlay cognitive hybridsatellite-terrestrial network (CHSTN) which constitutes a primary satellite source communicating with its multiple terrestrial primary receivers and two non-orthogonal multiple access (NOMA) secondary terrestrial users exchanging their information with the help of a half-duplex decode-and-forward based secondary relay. We demonstrate there exists an inevitable inter-user interference (IUI) due to the NOMA scheme, which causes an adverse effect on the performance of the secondary network. Hence, to achieve the improved performance and subsequently the low latency requirements, the wireless content caching is employed, whereby the relay can store the most popular contents of both the NOMA users. Further, the pertinent hybrid channels are characterized by the shadowed-Rician fading and Nakagami- fading models. Hereby, exploiting the mutual …