A “solar wind,” or dark mode electric discharge radiating from the Sun, blows outward at approximately 700 kilometers per second. In a gravity-centric analysis, heat and radiation pressure alone cannot explain how the charged particles of the solar wind are accelerated as they pass by the planets on their way to the heliospheric cathode. No solar physicists expected such acceleration until it was discovered.
You will find that the solar wind actually decelerates slightly on it's way past the planets. This is due to interstellar pickup ions mass loading the wind, and was measured by Voyager. The acceleration of the wind takes place close to the sun.
Another error here is the speed, which averages closer to 440 km/s in the ecliptic plane. Fast wind from the poles (or from coronal holes at lower latitude during solar maxima) can reach 700 km/s and higher.