text: what is the composition of solar wind? does it have any effect on the earth's magnetic field? the solar wind is a continuous stream of ions (electrically charged particles) that are given off by the sun. since the particles are emitted from the sun as the sun rotates, the solar wind blows in a pinwheel pattern through the solar system. it takes the solar wind about 5 days to reach earth; it has a velocity of about 500 miles/hour (800 km/sec). the solar wind travels along vibrating magnetic waves which are propagated by the sun