Noted a sudden closure on 160 meter band last night EST. Science is finding more about the upper atmosphere to ionosphere discharge. Started wondering if one had temporarily neutralized the reflective properties PBS has recorded recent activity of sprites. http://www.pbs.org/wgbh/nova/earth/edge-of-space.html 73 Bruce-K1FZ www.qsl.net/k1fz/pennantnotes.html