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Recently, two instruments of cosmic ray are operating in South Korea. One is Seoul muon detector after October 1999 and the\udother is Daejeon neutron monitor (Kang et al. 2012) after October 2011. The former consists of four small plastic scintillators\udand the latter is the standard 18 NM 64 type. In this report, we introduce the characteristics of both instruments. We also\udanalyze the flux variations of cosmic ray such as diurnal variation and Forbush decrease. As the result, the muon flux shows\udthe typical seasonal and diurnal variations. The neutron flux also shows the diurnal variation. The phase which shows the\udmaximum flux in the diurnal variation is around 13-14 local time. We found a Forbush decrease on 7 March 2012 by both\udinstruments. It is also identified by Nagoya multi-direction muon telescope and Oulu neutron monitor. The observation of\udcosmic ray at Jangbogo station as well as in Korean peninsula can support the important information on space weather in local\udarea. It can also enhance the status of Korea in the international community of cosmic ray experiments

Observation of Periodic and Transient Cosmic Ray Flux Variations by the Daejeon Neutron Monitor and the Seoul muon Detector