You're most likely seeing the ISS.
Current position: https://www.google.com/url?sa=t&rct=...ATqmPLFGgBUpTLQ
Live view from: http://www.ustream.tv/channel/9408562
The ebbing & flowing dunno. If the light was that bright your eyes just may not have adjusted fast/well enough to see anything. Could have been in part to the large geomagnetic storm that caused massive auroras on the 19th.
My best guess. There are a couple people on here that know a lot more about this kind of stuff than me. Hopefully they'll let me know I'm wrong & tell you what you really saw.
Pessimist: Oh, this can't get any worse!
Optimist: Yes, it can!
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