"Lars brandt" wrote in message
s.com...
Hello shortwavelovers

There have been a few sunstorms recently.
What effect has it on shortwave.
I think it blows away the bands first but what happens then after that?
Is it good for mediumwave dx?

Hi Lars,

All depend of your latitude and frequencies, as well as the energy flowing
in the sun plasma/gaz.
The most dramatic effects occur with G5 class geomagnetic storms or sunflare
of class X with Kp=7 or higher. In these conditions there are blackouts.
Usually all shortwaves (MF-UHF) observe a blackout but some extra openings
might occur in HF between for example LA and PY.
In these cases at mid and low latitude your can work HF but only on low
bands like 3.5, 7 Mhz, mostly local QSO, a bit on 14 (near countries or 5000
km away) if you live below 40°. Over 50° upper bands are closed, noisy.
Aurora allows propagation in VHF.
VLF propagation is enhanced due to the increase of ionisation in lower
layers
Search for more information on the Internet with keyword propagation,
blackout.

Read this too :
http://www.astrosurf.com/lombry/qsl-perturbation.htm with links on 2d page
http://www.astrosurf.com/lombry/qsl-propa.htm

Also in French (there is a Translation module in the left menu), these are
deep coverage of the subject:
http://www.astrosurf.com/lombry/indices.htm (solar , geo indices)
http://www.astrosurf.com/lombry/aurore.htm (aurora)
http://www.astrosurf.com/lombry/menu-soleil.htm (all about the sun)

Most subjects are explained on SEC/NOAA or NASA/MSFC websites too. Links can
be found on my website too.

73's
Thierry
ON4SKY


//Lars