Modeling a Realistic “Gradual” SEP Event within 2 AU

doi:10.15982/j.issn.2095-7777.2019.02.007

Journal of Deep Space Exploration ›› 2019, Vol. 6 ›› Issue (2) :156 -164. DOI: 10.15982/j.issn.2095-7777.2019.02.007

Topic：Deep Space Environment Exploration

Modeling a Realistic “Gradual” SEP Event within 2 AU

AO Xianzhi¹, LIU Siqing^1,2, SHEN Hua¹, WANG Jingjing¹, HU Junxiang³, LI Gang³

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Abstract

Coronal Mass Ejection (CME) -driven shocks, as a primary source of Solar Energetic Particles (SEP), can evolve significantly while propagating away from the Sun. Their characteristics are crucial to understand the underlying particle acceleration mechanism,considered to be the Diffusive Shock Acceleration(DSA)process. Modeling the propagation of CMEdriven shocks and the consequent DSA process is important to both space weather research and forecasting. By utilizing an improved particle acceleration and transport model,a realistic "gradual" SEP event that happened on April 18th,2014 was modelled. Four locations in the ecliptic plane within 2 Astronomical Units(AU)from the Sun,including the location of the Earth,are examined with the model. Our results show that shock geometry plays a very important role in determining the energetic particle fluxes.

Keywords

Solar energetic particles / particle acceleration / diffusive shock acceleration / space weather

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AO Xianzhi, LIU Siqing, SHEN Hua, WANG Jingjing, HU Junxiang, LI Gang. Modeling a Realistic “Gradual” SEP Event within 2 AU. Journal of Deep Space Exploration, 2019, 6(2): 156-164 DOI:10.15982/j.issn.2095-7777.2019.02.007