Direct observations of the formation of the solar wind halo from the strahl
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Date
2012-01-17
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Citation of Original Publication
Gurgiolo, C., Goldstein, M. L., ViƱas, A. F., and Fazakerley, A. N.: Direct observations of the formation of the solar wind halo from the strahl, Ann. Geophys., 30, 163ā175, https://doi.org/10.5194/angeo-30-163-2012, 2012.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
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.