A solar storm is on its way from the sun. This could disrupt satellites and mobile phone services. The flares are expected to come…today (Friday). To add, scientists are watching another storm form on the far side of the sun so another one will hit Earth in a couple weeks.
http://news.bbc.co.uk/2/hi/science/nature/3210901.stm
I didn’t know whether to consider this much of a threat, but I found it interesting.