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- One of the most important solar events from Earth's perspective is the coronal
- mass ejection, the solar equivalent of a hurricane. A CME is an eruption of a
- huge bubble of energized plasma from the Sun's outer atmosphere, or corona.
- Having escaped the Sun's gravity, a CME speeds across the gulf of space at
- velocities of some 400 km/sec. They reach the Earth in 2.5 to 5 days.
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- Just hours after blowing into space, a CME cloud can grow to dimensions
- exceeding those of the Sun itself, often as wide as 50 million kilometres
- across. As it ploughs into the solar wind, a CME can create a shock wave that
- accelerates particles to dangerously high energies and speeds. Behind that shock
- wave, the CME cloud flies through the solar system bombarding the Earth and
- other solar objects with radiation and plasma.
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