12-20 July 2017
Asia/Seoul timezone
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BEXCO - Room F(201/202/203/204)

[SH102] High-energy cosmic ray modulation associated with interplanetary shocks


  • Carlos Roberto BRAGA

Primary authors



Interplanetary shocks are caused both by interplanetary counterparts of coronal mass ejections (ICMEs) and by streaming interaction regions (SIRs) propagating in the interplanetary medium. SIRs are formed by the interaction between high-speed solar wind streams and slow solar wind streams. When the interplanetary disturbance propagates faster than the magnetosonic wave speed, in the solar wind frame, a shock wave is formed. Shocks frequently produce decreases of the cosmic rays observed both by neutron monitors and muon detectors located at the Earth’s surface. In this work, we analyze this kind of modulation of high-energy cosmic rays ( >~ 50 GeV) observed by the Global Muon Detector Network (GMDN). After correcting both the atmospheric temperature and pressure effects, we calculated the isotropic intensity, the anisotropy vector and the cosmic ray gradient in the Earth’s vicinity. We performed a superposed epoch analysis grouping the events by type and orientation of shocks from a list of interplanetary shock waves identified using interplanetary magnetic field and plasma parameters.