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Solar Energetic Particles

Part of the book series: Lecture Notes in Physics ((LNP,volume 932))

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Abstract

Large solar energetic-particle (SEP) events are clearly associated in time with eruptive phenomena on the Sun, but how? When large SEP events were first observed, flares were the only known candidate, and diffusion theory was stretched to the limit to explain how the particles could spread through space, as observed. The observation of coronal mass ejections (CMEs), and the shock waves they drive, provided better candidates later. Then small events were found with 1000-fold enhancements in 3He/4He that required a different kind of source—should we reconsider flares and their open-field cousins, solar jets? The 3He-rich events were soon associated with the electron beams that produce type III radio bursts. It seems the radio astronomers knew of both SEP sources all along. Sometimes the distinction between the sources is blurred when shocks reaccelerate residual 3He-rich impulsive suprathermal ions. Eventually, however, we would begin to measure the source-plasma temperature that better defines the SEP sources.

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    Donald V. Reames

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Reames, D.V. (2017). History. In: Solar Energetic Particles. Lecture Notes in Physics, vol 932. Springer, Cham. https://doi.org/10.1007/978-3-319-50871-9_2

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