This one is all over the internet as of today, but I thought I might post a link here in any case for the sake of being completist.
https://www.youtube.com/watch?v=7cicrtWHpc0
The halo reminds me of rocket fuel spewing as seen in other videos of malfunctioned launches, but it also looks similar to plasma discharge events, just.., big.
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Update:
The news is apparently calling the phenomenon the result of an Atlas 5 rocket launch and a second stage separation.
http://www.orlandosentinel.com/news/space/go-for-launch/os-atlas-v-launch-time-now-618-am-20150902-post.html
https://www.youtube.com/watch?v=7cicrtWHpc0
The halo reminds me of rocket fuel spewing as seen in other videos of malfunctioned launches, but it also looks similar to plasma discharge events, just.., big.
~~~~~~
Update:
The news is apparently calling the phenomenon the result of an Atlas 5 rocket launch and a second stage separation.
http://www.orlandosentinel.com/news/space/go-for-launch/os-atlas-v-launch-time-now-618-am-20150902-post.html