Space weather events can have significant effects all the way from the Sun to Earth. They have been implicated in the depletion of ozone and cloud formation, and their signatures may even be seen in ice core records spanning more than 400 years into the past. Solar activity at other planets, and elsewhere in the solar system, can be important, and violent flare activity can even be observed at other stars. Economically, these events may have severe consequences ranging from human exposure to increased radiation to disruption of communications, navigation and timing, and electrical power.
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