Link to a Washington Post article:
http://www.washingtonpost.com/national/health-science/first-ring-of-fire-eclipse-visible-in-us-in-nearly-20-years-also-can-be-seen-in-e-asia/2012/05/17/gIQAvQMPVU_story.html?hpid=z4

A related study on the appearance of mid-latitude irregularities seen with the Shigaraki MU radar during a partial eclipse can be accessed here
http://www.agu.org/pubs/crossref/2010/2010GL042855.shtml
