The effect of adiabatic energy loss on the parallel mean free path of solar energetic particles

Physics

Scientific paper

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7514 Energetic Particles (2114), 7807 Charged Particle Motion And Acceleration, 7859 Transport Processes, 2104 Cosmic Rays, 2114 Energetic Particles, Heliospheric (7514)

Scientific paper

The focused transport equation without adiabatic energy loss is widely used to model solar energetic particles'(SEP) interplanetary propagation. However, SEPs experience the effect of adiabatic energy loss because of the divergence of the solar wind flows. Our particle simulations show that adiabatic energy loss is significant even in a short period, e.g., less than one day. In this paper we will show the comparison between solutions of focused transport equations with and without energy loss. It will be shown that without energy loss, for gradual events, we can only fit the initial phase of SEP events. However, with energy loss, we can fit the entire (initial and decaying) phases. In addition, the values of the mean free path obtained by fitting the SEP events with or without energy loss are different. The results indicate that adiabatic energy loss cannot be neglected in the modeling of SEP events.

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