Re: Lousy conditions
toggle quoted messageShow quoted text
Jerry, We've had this conversation before.
In this case, the dinosaurs told you wrong.
Are you referring to the SFI?...Solar Flux Index?
The higher the SFI is, generally, the better the propagation is, unless the A index is high. Then, things are dead quiet.
Generally, propagation conditions are best when the A index is 15 or lower, and the K index is 3 or lower. Right now, the A index is 16. Besides causing auroral activity, high geomagnetic field conditions can affect the electrons in the ionosphere, reducing the maximum usable frequency (MUF).
The K-index quantifies disturbances in the horizontal component of earth's magnetic field with an integer in the range 0-9 with 1 being calm and 5 or more indicating a geomagnetic storm. It is derived from the maximum fluctuations of horizontal components observed on a magnetometer during a three-hour interval. Right now the K index is 4.
Everything I've learned since I graduated from L.S.U. in 1967, I learned on Google. :-)
From: Jerry N9AVY <n9avy@...>
To: main@070Club.groups.io <main@070Club.groups.io>
Sent: Sun, Apr 18, 2021 1:35 pm
Subject: Re: [070Club] Lousy conditions
Just quoting what I was told back when the dinosaurs roamed the land...
On Sunday, April 18, 2021, 03:31:05 PM CDT, Mike / KC7MAW <mneiner@...> wrote:
Are we talking about A index or something else. Everything I have ever read and observed supported a lower A index as being better for propagation...25 is not a good number to be sure, but as I understand things, going higher isn't going to make things better?
But, I sort of fly by the seat of my pants anyway..if the bands are dead, they are dead..
On Sun, Apr 18, 2021, 13:17 Jerry N9AVY <n9avy@...> wrote: