For Earth-sized planets solar winds don't have much affect. Geologic activity continuously pumps gas into the atmosphere and the planet has sufficient gravity t

For Earth-sized planets solar winds don't have much affect. Geologic activity continuously pumps gas into the atmosphere and the planet has sufficient gravity to retain its atmosphere over long time periods. With a thick atmosphere, the losses from solar wind just don't make a dent, it's only for planets with an already thin atmosphere that it becomes a significant factor, and even then it's still not the main contributor. For example solar wind only accounts for about 5% of Mars' current atmospheric loss rate. The component of Mars' atmospheric loss due to the solar wind is about 100 grams per second, which over 10 billion years would remove less than 1% of Earth's atmosphere. Venus, despite having essentially no magnetic field and being even closer to the sun nevertheless has an incredibly thick atmosphere more than 90 times thicker than Earth's.