Hi to everyone, >From ionization rates in the scientific literature, galactic cosmic rays (GCRs) result in more electrons down low in the ionosphere (from collisional ionization) - where ionospheric absorption occurs. So one would think that the more cosmic rays, the more absorption - which is not good for 160m (with absorption inversely proportional to the square of the frequency, 80m is affected much less). Is there a direct one-to-one relationship between GCRs and 160m propagation? I don't know because there are other processes going on in the lower ionosphere that may also impact 160m. Trying to tie one single parameter to 160m propagation is not likely the entire story.
As for the geomagnetic field (Ap) not being as low yet as in the last solar minimum, the lowest Ap occurs right at solar minimum or just after - when coronal holes (generally not CMEs) during the declining phase of the solar cycle decrease. So 160m continues to be a mystery - and I'm glad of it. Carl K9LA _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector