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Volume 301 - 35th International Cosmic Ray Conference (ICRC2017) - Session Solar & Heliospheric. SH-Transient solar phenomena (SEP, GLE, Forbush decreases)
Energy spectral properties of the twin-CME driven shocks
X. Wang,* Y. Yin, M. Ding, N. Wang, H. Shan
*corresponding author
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Pre-published on: 2017-08-16 15:26:07
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Abstract
More and more observations show that large ground-level
enhancement (GLE) events are often associated with twin coronal mass
ejections (CMEs). In the twin-shock scenario, the preceding
CME-driven shock provides an enhanced-level turbulence at the
upcoming CME-driven shock. In this work, we focus on the GLE event
on 2012 May 17, which would be associated with the twin-shock
interactions. Using the particle simulation method to examine the
effect of the preceding CMEs being surrounded by the forthcoming
CMEs on the energy spectrum. We use the preceding CMEs-driven shock
to produce an enhanced seed population injecting into the later
CME-driven shock for particle re-acceleration. As results, we
simulate the twin-shock interactions and obtain the compound proton
spectrum. Therefore we suggest that the twin-shock interactions
would produce an GLE event with an ``ankle-like'' proton spectral
slope.
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