Solar wind

From Memory Alpha, the free Star Trek reference

The solar wind is a stream of plasma ejected from a star.

Solar sail spacecraft, such as ancient Bajoran lightships, were propelled by the solar wind. (DS9: "Explorers")

Solar wind was one of the factors that Harry Kim compensated for when he extrapolated a more accurate course for the Friendship 1 probe in 2378. (VOY: "Friendship One")