Astronomers have been observing Mars and Venus using specialized spacecrafts and have discovered some exciting similarities between the two planets. Both planets have electrically charged particles flowing in streams out of their atmospheres. The particles get propelled away because of the planets' interactions with solar wind. Neither Mars nor Venus have a magnetic field strong enough to divert solar wind so both planets experience the full impact. Earth's natural magnetism prevents solar wind from directly interacting with its atmosphere. The density and thickness of the atmospheres of Mars and Venus are different but the structure of the magnetic fields are both alike.
http://www.astronomy.com/asy/default.aspx?c=a&id=6710
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