[Fwd: LF: Flares and conditions]

[Andre' Kesteloot]

Rik Strobbe wrote:

> At 09:47 3/03/00 -0000, G3XDV wrote:
> >Not sure how much influence the flares had on the conditions (it's
> >easy to see coincidence as evidence), especially as the good
> >conditions Larry experienced last month coincided with a very high
> >A index (50+), a few days =after= the major flares. The A index
> >was 18 on the 1st, and is reported today (from yesterday's data) as
> >down to 12. Nevertheless this is interesting data.
>
> Solar activity (storms -flares) have immediate effects on propagation (as
> shortwave blackout or MDE) that are caused by electromagnetic radiation and
> delayed effects (as aurora on VHF) that are caused by ionised particles
> travelling at much slower speed. The delay can be several days. The fact
> that the improved propagation noted by Larry correlates with the A-index
> could mean the it are these delayed effects that affect LF propagation.
>
> 73, Rik