I will show wonders in the heavens and on the earth, blood and fire and billows of smoke. 31 The sun will be turned to darkness and the moon to blood before the coming of the great and dreadful day of the Lord.
http://content.usatoday.com/communities/sciencefair/post/2012/09/northern-lights-ahead-for-usa/1?loc=interstitialskip#.UEK4kZa5BMw
Either these events were not covered as much in the past, we had not been paying attention to them, or they are happening more often.