[OZAPRS] propagation today

[Liz]

On Mon, 14 Jun 2021 08:20:48 +1000
Ray <aprs at exemail.com.au> wrote:

> I wasn't particularly looking yesterday but for ADS-B I "saw" one
> plane in excess of 450km to the south of me and that's unusual, I
> normally run out of range around 350km in that direction. I regularly
> see 500km+ over the Pacific but not to the south.
> 
> Pretty much whenever a low pressure trough pushes against a high
> pressure system there'll be enhanced propagation somewhere towards
> the high.  The classic is a high over the Tasman Sea, between Oz and
> NZ, and a low trough in western Victoria. That happens frequently and
> I see aircraft over the Pacific to 600km+ at those times, well beyond
> normal range.
> 
> The attachment is timed 00:00 yesterday (Sunday) and if that high and
> low system was rotated 90° CW I'd expect some sort of enhancement
> over the Pacific.  I'm a lot less familiar with inland systems,
> however.
> 
> Ray vk2tv

I haven't had anything special on my ADS-B in the last 24 hours. For
superb VHF propagation I like a high pressure system sitting overhead
but I haven't checked where the lows sit at the same time.

Liz
VK2XSE