The solar magnetic field flip, of course!
I blogged about this awhile ago, back when NASA stated that the flip would complete within three to four months. Now they’re saying that they can predict it will occur within a few weeks.
Apparently the most noticeable affect of this on earth will be an increase in the aurora australis and aurora borealis, but there also might be some interference with satellites and some radio blackouts.
At least those giant solar storms they were predicting haven’t happened…yet.