Early article about chaff
http://www.thedrive.com/the-war-zone/25460/now-massive-plumes-of-chaff-are-lighting-up-radar-over-maine-and-florida-too
Another one published with much of the same info. Also throws in cover for alien invasion angle. Just seems interesting.
https://www.courierpress.com/story/opinion/columnists/jon-webb/2019/01/15/more-chaff-additional-blips-deepen-radar-mystery/2583764002/