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Space weather study by Cosmic Ray observations

The sun's activities, such as solar flare and Coronal Mass Ejection (CME), sometimes effects human activities on the earth and in space. Those phenomena are currently studied as "Space Weather". Cosmic rays (CRs) can be used as one of the tool to investigate space weather phenomena. Cosmic rays are high-energy charged particles (mainly protons) generated or accelerated somewhere in the galaxy or outside the galaxy. Because CRs are charged particles, Interplanetary Magnetic Field (IMF) rules their trajectory. Although CR is normally isotropic, it shows anisotropy when magnetic structure ejected by CME comes close to the Earth, We observe this anisotropy to study space weather. The observation is performed as an all sky monitor of CR by the Global Muon Detector Network (GMDN), which consists of four stations in Japan, Australia, Brazil and Kuwait.

Recently, a new observation was started at Syowa Station in the Antarctic. This observation is expected to be a key to connect GMDN data with Neutron Monitor (NM), CR observation in different energy range. The GMDN and the NM network (SSE) observations have their own accomplishments. This is the first attempt to integrate those data for space weather research.


Chihiro KATO
Chihiro KATO Physics