Comment Section

A clear shock arrived around 00:27 UT on the 12/31/2015. After about 19 hours, a clear magnetic cloud arrived. The velocity jumped twice in the sheath region. The shock may not caused by the ICME.(Yutian)

Image Data

A combination of MFI and SWE data from the Wind Satellite:

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The grey region shows an approximation of the CME cloud and the red vertical line denotes the shock.