Le site de vulgarisation scientifique de l’Université de Liège. ULg, Université de Liège
Solar wind

Solar ‘wind’ is evidently not a current of air as we normally understand it but is made up of a flow of particles originating from the Sun which constantly sweep the interplanetary environment. The particles are electrically charged. This wind is not particularly dense (10 particles per cubed centimetre) but is very fast (400 to 800 kilometres per second). It is principally made up of electrons, protons and helium nuclei. The solar wind fluctuates wildly.

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