Hi Laurence you dont say what frequency the pole to pole path was? I wonder whether it might have been a sort of duct (trough its sometimes called) above the D-layer. The auroral hole might even help
Hi Laurence, interesting! Like Alan, I've wondered whether your N-S polar communication could have been through a field-aligned magnetospheric duct (referenced eg. by http://www.researchgate.net/publ