Direct observations of the formation of the solar wind halo from the strahl

Gurgiolo, C.; Goldstein, M. L.; Viñas, A. F.; Fazakerley, A. N.

Observations of a continual erosion of the strahl and build up of the halo with distance from the sun suggests that, at least in part, the halo may be formed as a result of scattering of the strahl. This hypothesis is supported in this paper by observation of intense scattering of strahl electrons, which gives rise to a proto-halo electron population. This population eventually merges into, or becomes the halo. The fact that observations of intense scattering of the strahl are not common implies that the formation of the halo may not be a continuous process, but one that occurs, in part, in bursts in regions where the conditions responsible for the scattering are optimum.

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Gurgiolo, C. / Goldstein, M. L. / Viñas, A. F. / et al: Direct observations of the formation of the solar wind halo from the strahl. 2012. Copernicus Publications.

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