handheld wrote:

Conan Ford wrote:

I'm located in Calgary, Alberta at about 51 N and 114 W. I've noticed that
I can often copy Radio Australia and Radio New Zealand International all
throughout the night, even up to 15 mhz sometimes. Shouldn't broadcasts
above about the 49 m band be very hard to hear at night?

Considering the currently low solar flux and the early sunset time for
your location now, it would be unusual to hear them on 15-Mhz all night
at this time of year, but it does occasionally happen. Compared to
eastern North America, you do have an advantage for the higher
frequencies because you're farther west and your sunset time is
relatively later. The lower frequencies like 31-m are usually
propagating well from the South Pacific to North America after midnight.
I start hearing RA and RNZ at around 0800-UTC on 9580/9590 and 9885
respectively. I'm located in the northeast.

One thing that actually helps the higher frequencies at this time of year in the
Northern Hemisphere is that at this point in our orbit around the sun we are
actually closer to the sun and that at times aids propagation a bit due to
higher solar radiation levels hitting the ionosphere.

dxAce
Michigan
USA