S130513 1607 UTC - X2.8 flare, radio emission, and SID ionospheric opacity increase, during Jovian observing run at Nancay Plase see: http://herrero-radio-astronomy.blogspot.com/2013/05/s130513-1607-utc-x28-flare-radio.html Busy day ! FUN !! Victor :-) Dr. Eng. Victor Herrero-Arrieta Ph.D. M.S. Ing.Ind. http://herrero-radio-astronomy.blogspot.com/view/magazine Radio Astronomy Blog https://groups.google.com/d/forum/victor-herrero-radio-astronomy Messages https://groups.google.com/forum/?hl=es&fromgroups#!forum/red-radioastronomia-en-espanol http://herrero-victor.blogspot.com/ Astronomy Blog http://historia-filosofia-fisica.blogspot.com/ Historia y Filosofia de la Fisica http://victorstravelpictures.blogspot.com/ Travel pictures