Awkward Physics II:

People had done a lot of work on electric current and related phenomena, including electromagnetism, long before the discovery of the electron.

Having named the two types of charge ‘positive’ and ‘negative’, and recognising that flow was key, a decision had to be made on the direction of flow. It made sense to say that it flowed from positive to negative. This is called the direction of conventional current.

Indeed, positive charge carriers such as protons and positive ions, flow from positive to negative. Electrons, however, which are the charge carriers inside metal conductors, have negative charge and flow from negative to positive.

The solar wind has both electrons and protons, all flowing away from the Sun, but experience force  in different directions when they meet a magnetic field such as the Earth’s.