WHEN they hit the K Index shoots up bringing up with it, the noise floor (as is the situation at the moment) BUT …
The two days before the winds hit (i.e. when they are still on their way here) HF radio conditions appear to improve - why is that? It also seems when these “pre-solar-wind-hit” conditions occur, not only are signals better in general but often I can hear stations closer-in to me than I normally can given the skip distance on the various bands.
This situation with improved day time radio conditions before the solar winds hit the Ionosphere seems to be consistent, as I have now witnessed it a few times this year.
It is also thought that the day after the winds subside, there is a short improvement of conditions for up to a day or so.
To this end, Mike 2E0YYY @2E0YYY , Jonathon VK7JON @vk7jon and I will try for HF contacts on this Wednesday morning (10th. Oct 2018) around 0700 UTC, to see if we have improved conditions as it is hoped that the last of the solar winds will have disolved by then. We could of course be a day early but as there’s no accurate way of knowing how long it will be before the current solar winds will subside, Wednesday morning is as likely a time as any and around 0700 UTC is the time that VK & ZL stations were being heard last week.