Welcome de KL7J
Soldotna - Alaska.
Some reasons why Alaska Radio Propagation is difficult.
The farther North or South of the equator is significant.
The daytime F region frequencies peak not at the magnetic equator, but around 15 to 20 degrees north and south of it. This is called the equatorial anomaly. At night, frequencies reach a minimum around 60 degrees latitude north [South Central AK] and south of the geomagnetic equator. This is called the mid-latitude trough. Large tilts can occur in the vicinity of these phenomena which may lead to variations in the range of sky waves that have reflection points nearby.
The ionosphere becomes quite variable in the polar regions due to the variable energy input from the solar wind. The near-vertical magnetic field funnels particles into this region and changes in energy input can trigger atmospheric waves and dramatic changes in the electron profile over short time scales. Link to details and source.
This graph shows highest frequencies refracted vertically from the E and F2 region at noon (Day hemisphere) and midnight (Night hemisphere).
An example of northern zone geomagnetic versus latitudes further south.
Arctic Radio propagation by University of Alaska Geophysical Institute forum, on Alaska and N.W. Canada.
Permafrost, rugged mountain terrain and the ionospheric effects associated with the aurora.
The high-latitude ionosphere and its effects on radio propagation by: R.D.Hunsucker, J.K. Hargreaves, 2003.
The low-latitude zone, spanning 20 or 30 deg either side of the magnetic equator, is strongly influenced by electromagnet forces that arise because the geomagnetic field runs horizontally over the magnetic equator. The primary consequence is that the electrical conductivity is abnormally large over the equator…
At high latitudes we find the opposite situation. Here the geomagnetic field runs nearly vertical, and this simple fact of nature leads to the existence of an ionosphere that is considerably more complex than that in either the middle or the low-latitude zones. "This happens because the magnetic field-lines connect the high latitudes to the outer part of the magnetosphere which is driven by the solar wind, whereas the ionosphere at middle latitude is connected to the inner magnetosphere which essentially rotates with the Earth and so is less sensitive to external influence."
The Magnetic North Pole is close to Alaska compared to most DX countries.
This geatly impacts propagation on the high and low bands, MUF and absorption.
Near polar paths are very impacted.
KL7J - Soldotna, Alaska
KL7J.LB at gmail.com