Observation of Periodic and Transient Cosmic Ray Flux Variations by the Daejeon Neutron Monitor and the Seoul muon Detector
Recently, two instruments of cosmic ray are operating in South Korea. One is Seoul muon detector after October 1999 and the other is Daejeon neutron monitor (Kang et al. 2012) after October 2011. The former consists of four small plastic scintillators and the latter is the standard 18 NM 64 type....
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
The Korean Space Science Society
2013-09-01
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| Series: | Journal of Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2013/v30n3/OJOOBS_2013_v30n3_175.pdf |
| Summary: | Recently, two instruments of cosmic ray are operating in South Korea. One is Seoul muon detector after October 1999 and the
other is Daejeon neutron monitor (Kang et al. 2012) after October 2011. The former consists of four small plastic scintillators
and the latter is the standard 18 NM 64 type. In this report, we introduce the characteristics of both instruments. We also
analyze the flux variations of cosmic ray such as diurnal variation and Forbush decrease. As the result, the muon flux shows
the typical seasonal and diurnal variations. The neutron flux also shows the diurnal variation. The phase which shows the
maximum flux in the diurnal variation is around 13-14 local time. We found a Forbush decrease on 7 March 2012 by both
instruments. It is also identified by Nagoya multi-direction muon telescope and Oulu neutron monitor. The observation of
cosmic ray at Jangbogo station as well as in Korean peninsula can support the important information on space weather in local
area. It can also enhance the status of Korea in the international community of cosmic ray experiments. |
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| ISSN: | 2093-5587 2093-1409 |