VLF, Just discovered a strange QRN pattern on VLF this night. See attachment. The origin cannot be local because the same was shown on the OK2BVG VLF grabber. What is it? 73, Stefan/DK7FC Attachment:
Stefan, the banded spectral structure could be due to multiple bounces between the ionosphere and ground. Under favourable conditions, consecutive steeper and steeper reflections can produce a "tweek
... rethinking my reply: multiple-hop tweek formation may not be required to explain the bands. Even a simple superposition of groundwave and a single ionospheric reflection will create this type of
Yes. As the French storm cells slowly approached Heidelberg this morning, the path difference between groundwave and skywave gradually increased, producing a downward shift of the spectral bands. Acc
